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? 2007-2015 microchip technology inc. ds20002071c-page 1 mcp73837/8 features highly accurate preset voltage regulation: 0.5% available voltage regulation options: - 4.20v, 4.35v, 4.4v or 4.5v complete linear charge management controller: - autonomous power source selection - integrated pass transistors - integrated current sense - integrated reverse discharge protection constant current (cc)/constant voltage (cv) operation with thermal regulation selectable usb port charge current: - low: 1 unit load - high: 5 unit loads programmable ac adapter charge current: - 15 ma C 1000 ma two-charge status outputs power-good monitor: mcp73837 timer enable: mcp73838 automatic recharge: - selectable voltage threshold automatic end-of-charge control: - selectable charge termination current ratio - selectable safety timer period preconditioning of deeply depleted cells C can be disabled battery cell temperature monitor uvlo (undervoltage lockout) automatic power-down when input power is removed low-dropout (ldo) linear regulator mode numerous selectable options available for a variety of applications: - refer to section 1.0 electrical characteris- tics for selectable options - refer to the product identification system for standard options temperature range: -40c to 85c packaging: - 10-lead 3 mm x 3 mm dfn - 10-lead msop* * consult the factory for msop availability. applications smart phones and personal data assistants (pda) portable media players (pmp) ultra mobile devices (umd) digital cameras mp3 players bluetooth headsets handheld medical devices ac/usb dual source li-ion battery chargers description the mcp73837 and mcp73838 devices are fully integrated linear li-ion/li-polymer battery chargers with autonomous power source selection. along with its small physical size, the low number of external components required makes the mcp73837/8 ideally suitable for portable applications. the mcp73837/8 automatically selects the usb port or ac adapter as the power source for the system. for the usb port powered systems, the mcp73837/8 specifically adheres to the current limits governed by the usb specification. the host microcontroller can select from two preset maximum charge current rates of 100 ma (low-power usb port) or 500 ma (high-power usb port). with an ac adapter providing power to the system, an external resistor sets the mag- nitude of the system or charge current up to a maximum of 1a. the mcp73837/8 employs a constant current/constant voltage charge algorithm with selectable preconditioning and charge termination. the constant voltage regulation is fixed with four available options: 4.20v, 4.35v, 4.40v or 4.50v, to accommodate the new emerging battery charging requirements. the mcp73837/8 limits the charge current, based on die temperature, during high power or high ambient conditions. this thermal regulation optimizes the charge cycle time while maintaining the reliability of the device . the mcp73837/8 are fully specified over the ambient temperature range of -40c to +85c. the mcp73837/8 devices are available in either a 3 mm x 3 mm 10-lead dfn package or a 10-lead msop package. advanced stand-alone li-ion/li-polymer battery charge management controller with autonomous ac adapter or usb port source selection downloaded from: http:///
mcp73837/8 ds20002071c-page 2 ? 2007-2015 microchip technology inc. package types typical applications 23 4 56 7 8 9 prog2 v ss v usb stat1 pg (te ) therm 3x3 1 0-lead dfn* mcp73837/8 stat2 11 0 v bat v ac prog1 6 7 8 9 prog2 v ss v usb stat1 pg (t e ) therm 10-lead msop mcp73837/8 stat2 10 v bat v ac prog1 12 34 5 ep 11 *includes exposed thermal pad (ep); see tab l e 3 - 1 . stat1 v ac v ss p g v bat single li-ion cell 4 mcp73837 typical application 5 3 1 4.7 f 2 ac/dc adapter stat2 therm v usb prog1 prog2 usb port 6 7 hi low thermistor r prog 8 9 10 1k ? 1k ? 1k ? stat1 v ac v ss t e v bat cell 4 mcp73838 typical application 5 3 1 2 ac/dc adapter stat2 therm v usb prog1 prog2 usb port 6 7 hi low thermistor 8 9 10 hi low 1 k ? 1 k ? 4.7 f 4.7 f 4.7 f 4.7 f 4.7 f r prog downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 3 mcp73837/8 functional block diagram (mcp73837/8) reference, bias, uvlo, and shdn v ref (1.21v) stat1 prog1 v bat sensefetg = 0.001 v ss direction control 175k +- precondition +- term +- 111k +- ca 10k 157.3k 6k 48k 470.6k charge +- +- va 72.7k 310k 1k +- crrentlimit +- ltvt +- htvt 470.6k121k therm $ charge control, timer, and stats logic stat2pg (te) ldo 1m 175k direction control $ 10k 2k 100ma/500ma sensefetg = 0.001 sensefet g = 0.001 sensefetg = 0.001 v ref ac/usb ac/usb vo reg vo reg vo reg uvlo vo reg prog2 v ac v usb downloaded from: http:///
mcp73837/8 ds20002071c-page 4 ? 2007-2015 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings? v ddn .................................................................................7.0v all inputs and outputs w.r.t. v ss ............. -0.3 to (v dd +0.3)v maximum junction temperature, t j ............internally limited storage temperature .....................................-65c to +150c esd protection on all pins human body model (1.5 k ? in series with 100 pf) ...... ? 4kv machine model (200 pf, no series resistance) .............300v ? notice: stresses above those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this sp ecification is not implied. exposure to maximum rating conditions for extended periods may affect device reliability. dc characteristics electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typical) + 0.3v] to 6v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typical) + 1.0v]. parameters sym. min. typ. max. units conditions supply input supply voltage v dd v reg (typ) +0.3v 6v ( 1 ) supply current i ss 1900 3000 a charging 110 300 a charge complete, no battery 75 100 a standby (prog floating) 0.6 5 a shutdown (v dd v bat C 100 mv or v dd < v stop ) uvlo start threshold v start 3.35 3.45 3.55 v v dd = low to high (usb port) uvlo stop threshold v stop 3.25 3.35 3.45 v v dd = high to low (usb port) uvlo hysteresis v hys 75 mv (usb port) uvlo start threshold v start 4.1 4.15 4.3 v (ac adapter) uvlo stop threshold v stop 4.0 4.1 4.2 v (ac adapter) uvlo hysteresis v hys 55 mv (ac adapter) voltage regulation (constant voltage mode) regulated charge voltage v reg 4.179 4.20 4.221 v v dd = [v reg (typical) + 1v] 4.328 4.35 4.372 v i out = 30 ma 4.378 4.40 4.422 v t a = -5c to +55c 4.477 4.50 4.523 v regulated charge voltage tolerance v rtol -0.5 +0.5 % t a = -5c to +55c line regulation ??? v bat /v bat ) / ? v dd | 0.075 0.2 %/v v dd = [v reg (typical)+1v] to 6v i out = 30 ma load regulation ?? v bat /v bat | 0.150 0.3 % i out = 10 ma to 100 ma v dd = [v reg (typical)+1v] supply ripple attenuation psrr 60 db i out = 10 ma, 10hz to 1 khz 5 2 d b i out = 10 ma, 10hz to 10 khz 2 3d b i out = 10 ma, 10hz to 1 mhz current regulation (fast charge constant-current mode) ac adapter fast charge current i reg 95 105 115 ma prog1 = 10 k ? 900 1000 1100 ma prog1 = 1 k ??? ( 2 ) t a = -5c to +55c note 1: the supply voltage (v dd ) = v ac when input power source is from ac adapter and the supply voltage (v dd ) = v usb when input power source is from the usb port. 2: the value is guaranteed by design and not production tested. 3: the current is based on the ratio of selected current regulation (i reg ). the maximum charge impedance has to be less than shutdown impedance for normal operation. downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 5 mcp73837/8 usb port fast charge current i reg 80 90 100 ma prog2 = low 400 450 500 ma prog2 = high t a = -5c to +55c maximum output current limit i max 1200 ma prog1 < 833 ? precondition current regulation (trickle charge constant-current mode ) precondition current ratio i preg /i reg 7.5 10 12.5 % ( 3 ) 1 52 02 5% t a = -5c to +55c 30 40 50 % 100 % precondition current threshold ratio v pth /v reg 64 66.5 69 % v bat low to high 69 71.5 74 % precondition hysteresis v phys 120 mv v bat high to low charge termination charge termination current ratio i term /i reg 3.75 5 6.25 % prog1 = 1 k ?? to 10 k ? 5.6 7.5 9.4 % t a = -5c to +55c 7.5 10 12.5 % ( 3 ) 15 20 25 % automatic recharge recharge voltage threshold ratio v rth /v reg 92 94.0 96 % v bat high to low 9 59 79 9% t a = -5c to +55c pass transistor on-resistance on-resistance r dson 350 m ? v dd = 4.5v, t j = +105c battery discharge current output reverse leakage current i discharge 0.1 2 a standby (prog1 or prog2 floating) 0.55 2 a shutdown (v dd v bat -100 mv or v dd < v stop ) -6 -15 a charge complete status indicators C stat1, stat2, pg (mcp73837) sink current i sink 1 63 5m a low output voltage v ol 0 . 31v i sink = 4 ma input leakage current i lk 0.03 1 a high impedance, v dd on pin prog1 input (prog1) charge impedance range r prog 1k ? ( 4 ) shutdown impedance r prog 70 200 k ? minimum impedance for shutdown prog2 inputs (prog2) input high voltage level v ih 0.8v dd % input low voltage level v il 0.2v dd % shutdown voltage level v sd 0.2v dd 0 . 8 v dd % input leakage current i lk 71 5 a v prog2 = v dd dc characteristics (continued) electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typical) + 0.3v] to 6v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typical) + 1.0v]. parameters sym. min. typ. max. units conditions note 1: the supply voltage (v dd ) = v ac when input power source is from ac adapter and the supply voltage (v dd ) = v usb when input power source is from the usb port. 2: the value is guaranteed by design and not production tested. 3: the current is based on the ratio of selected current regulation (i reg ). the maximum charge impedance has to be less than shutdown impedance for normal operation. downloaded from: http:///
mcp73837/8 ds20002071c-page 6 ? 2007-2015 microchip technology inc. timer enable (te) input high voltage level v ih 2v input low voltage level v il 0 . 8v input leakage current ilk 0 . 0 11 a v te = v dd thermistor bias thermistor current source i therm 47 50 53 a 2 k ? < r therm < 50 k ? thermistor comparator upper trip threshold v t1 1.20 1.23 1.26 v v t1 low to high upper trip point hysteresis v t1hys - 4 0m v lower trip threshold v t2 0.235 0.250 0.265 v v t2 high to low lower trip point hysteresis v t2hys 4 0m v system test (ldo) mode input high voltage level v ih v dd C 0.1 v therm input sink current i sink 3 5.5 20 a stand-by or system test mode bypass capacitance c bat 1 4.7 f f i out < 250 ma i out > 250 ma automatic power down (sleep comparator, direction control) automatic power down entry threshold v pd v bat + 10 mv v bat + 100 mv v2 . 3 v v bat v reg v dd falling automatic power down exit threshold v pdexit v bat + 150 mv v bat + 250 mv v2.3v v bat v reg v dd rising thermal shutdown die temperature t sd 150 ? c die temperature hysteresis t sdhys 1 0 ? c dc characteristics (continued) electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typical) + 0.3v] to 6v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typical) + 1.0v]. parameters sym. min. typ. max. units conditions note 1: the supply voltage (v dd ) = v ac when input power source is from ac adapter and the supply voltage (v dd ) = v usb when input power source is from the usb port. 2: the value is guaranteed by design and not production tested. 3: the current is based on the ratio of selected current regulation (i reg ). the maximum charge impedance has to be less than shutdown impedance for normal operation. downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 7 mcp73837/8 ac characteristics temperature specifications electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typical) + 0.3v] to 6v. typical values are at +25c, v dd = [v reg (typical) + 1.0v] . parameters sym. min. typ. max. units conditions uvlo start delay t start 5 m sv dd low to high current regulation transition time out of precondition t delay 1 0 m sv bat < v pth to v bat > v pth current rise time out of precondition t rise 1 0 m si out rising to 90% of i reg precondition comparator filter time t precon 0.4 1.3 3.2 ms average v bat rise/fall termination comparator filter time t term 0.4 1.3 3.2 ms average i out falling charge comparator filter time t charge 0.4 1.3 3.2 ms average v bat falling thermistor comparator filter time t therm 0.4 1.3 3.2 ms average therm rise/fall elapsed timer elapsed timer period t elapsed 0 0 0 hours timer disabled 3.6 4.0 4.4 hours 5.4 6.0 6.6 hours 7.2 8.0 8.8 hours status indicators status output turn-off t off 500 s i sink = 1ma to 0ma status output turn-on t on 500 s i sink = 0ma to 1ma electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ.) + 0.3v] to 6v. typical values are at +25c, v dd = [v reg (typ.) + 1.0v] . parameters sym. min. typ. max. units conditions temperature ranges specified temperature range t a -40 +85 c operating temperature range t j -40 +125 c storage temperature range t a -65 +150 c thermal package resistances thermal resistance, 10-lead msop ? ja 113 c/w 4-layer jc51-7 standard board, natural convection ( 1 ) thermal resistance, 10-lead 3 x 3 dfn ? ja 41 c/w 4-layer jc51-7 standard board, natural convection note 1: this represents the minimum copper condi tion on the printed circuit board (pcb). downloaded from: http:///
mcp73837/8 ds20002071c-page 8 ? 2007-2015 microchip technology inc. 2.0 typical performance curves note: unless otherwise indicated, v dd = [v reg (typical) + 1v], i out = 30 ma, and t a = +25c, constant-voltage mode. figure 2-1: battery regulation voltage (v bat ) vs. supply voltage (v dd ). figure 2-2: battery regulation voltage (v bat ) vs. ambient temperature (t a ). figure 2-3: output leakage current (i discharge ) vs. battery regulation voltage (v bat ). figure 2-4: output leakage current (i discharge ) vs. ambient temperature (t a ). figure 2-5: output leakage current (i discharge ) vs. battery voltage (v bat ). figure 2-6: charge current (i out ) vs. programming resistor (r prog ). note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance characteristics listed herein are not tested or guaranteed. in some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 4.160 4.165 4.170 4.175 4.180 4.185 4.190 4.195 4.200 4.205 4.210 4.5 4.8 5.0 5.3 5.5 5.8 6.0 supply voltage (v) battery regulation voltage (v) temp = 25c i out = 10 ma i out = 100 ma i out = 500 ma i out = 1000 ma i out = 50 ma 4.170 4.175 4.180 4.185 4.190 4.195 4.200 4.205 4.210 -40-30-20-100 1020304050607080 ambient temperature (c) battery regulation voltage (v) i out = 10 ma v dd = 5.2v i out = 1000 ma i out = 500 ma i out = 100 ma i out = 50 ma 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 battery voltage (v) output leakage current (a) v dd = v bat temp = 25 c 0.0 0.4 0.8 1.2 1.6 2.0 -40-30-20-10 0 1020304050607080 temperature (c) output leakage current (a) v dd = floating v bat = 4.2v 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 battery voltage (v) output leakage current (a) v dd = floating temp = +25c 0 100 200 300 400 500 600 700 800 900 1000 1 6 11 16 21 26 31 36 41 46 51 56 61 r prog (k ? ) i reg (ma) v dd = 5.2v temp = 25c downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 9 mcp73837/8 note: unless otherwise indicated, v dd = [v reg (typical) + 1v], i out = 30 ma and t a = +25c, constant-voltage mode. figure 2-7: charge current (i out ) vs. supply voltage (v dd ). figure 2-8: charge current (i out ) vs. supply voltage (v dd ). figure 2-9: charge current (i out ) vs. ambient temperature (t a ). figure 2-10: charge current (i out ) vs. ambient temperature (t a ). figure 2-11: charge current (i out ) vs. ambient temperature (t a ). figure 2-12: charge current (i out ) vs. junction temperature (t j ). 700 750 800 850 900 950 1000 1050 1100 1150 1200 4.5 4.8 5.0 5.3 5.5 5.8 6.0 supply voltage (v) charge current (ma) r prog = 1 k ? temp = +25c 90 92 94 96 98 100 102 104 4.5 4.8 5.0 5.3 5.5 5.8 6.0 supply voltage (v) charge current (ma) r prog = 10 k ? temp = +25c 700 750 800 850 900 950 1000 1050 1100 -40-30-20-10 0 1020304050607080 ambient temperature (c) charge current (ma) r prog = 1 k ? v dd = 5.2v 90 92 94 96 98 100 102 104 106 108 110 -40-30-20-10 0 1020304050607080 ambient temperature (c) charge current (ma) r prog = 10 k ? v dd = 5.2v 45 46 47 48 49 50 51 52 53 54 55 -40-30-20-10 0 1020304050607080 ambient temperature (c) charge current (ma) r prog = 20 k ? v dd = 5.2v 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 2535 45 55 65 75 85 95 105115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 1 k ? downloaded from: http:///
mcp73837/8 ds20002071c-page 10 ? 2007-2015 microchip technology inc. note: unless otherwise indicated, v dd = [v reg (typical) + 1v], i out = 30 ma and t a = +25c, constant-voltage mode. figure 2-13: charge current (i out ) vs. junction temperature (t j ). figure 2-14: charge current (i out ) vs. junction temperature (t j ). figure 2-15: thermistor current (i therm ) vs. supply voltage (v dd ). figure 2-16: thermistor current (i therm ) vs. ambient temperature (t a ). figure 2-17: power supply ripple rejection (psrr). figure 2-18: power supply ripple rejection (psrr). 0 50 100 150 200 250 300 350 400 450 500 550 600 2535 45 55 65 75 85 95 105 115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 2 k ? 0 10 20 30 40 50 60 70 80 90 100 110 120 2535 45 55 65 75 85 95 105115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 10 k ? 47.0 47.5 48.0 48.5 49.0 49.5 50.0 50.5 51.0 51.5 52.0 4.5 4.8 5.0 5.3 5.5 5.8 6.0 supply voltage (v) thermistor current (ma) temp = +25c 47.0 47.5 48.0 48.5 49.0 49.5 50.0 50.5 51.0 51.5 52.0 -40 -30 -20 -10 0 1020 30 40 50 60 70 80 90 ambient temperature (c) thermistor current (ma) v dd = 5.2v -70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency (khz) attenuation (db) i out = 10 ma c out = 4.7 f -70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency (khz) attenuation (db) i out = 100 ma c out = 4.7 f downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 11 mcp73837/8 note: unless otherwise indicated, v dd = [v reg (typical) + 1v], i out = 30 ma and t a = +25c, constant-voltage mode. figure 2-19: line transient response. figure 2-20: line transient response. figure 2-21: load transient response. figure 2-22: load transient response. figure 2-23: v ac start delay (i out = 1a). figure 2-24: v usb start delay (usb = low). 0 2 4 6 8 10 12 14 16 -200 -100 0 100 200 300 400 500 600 700 time (s) input source (v) -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 output ripple (v) i out = 100 ma v out v in 0 2 4 6 8 10 12 14 16 -200 -100 0 100 200 300 400 500 600 700 800 time (s) input source (v) -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 output ripple (v) i out = 10 ma v out v in -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 -4.0e-04 -2.0e-04 0.0e+00 2.0e-04 4.0e-04 6.0e-04 8.0e-04 1.0e-03 1.2e-03 1.4e-03 1.6e-03 time (minutes) output current (a) -0.12 -0.1 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 output ripple (v) i out = 10 ma i out v out(ac) -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -4.0e-04 -2.0e-04 0.0e+00 2.0e-04 4.0e-04 6.0e-04 8.0e-04 1.0e-03 1.2e-03 1.4e-03 1.6e-03 time (minutes) output current (a) -0.3 -0.25 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 output ripple (v) i out = 100 ma i out v out v in v out v in v out downloaded from: http:///
mcp73837/8 ds20002071c-page 12 ? 2007-2015 microchip technology inc. note: unless otherwise indicated, v dd = [v reg (typical) + 1v], i out = 30 ma and t a = +25c, constant-voltage mode. uvlovac figure 2-25: v usb start delay (usb = high) figure 2-26: complete charge cycle (1200 mah li-ion battery). figure 2-27: typical charge profile in thermal regulation (1200 mah li-ion battery). figure 2-28: complete charge cycle (180 mah li-ion battery). figure 2-29: typical charge profile in preconditioning and cc-cv (180 mah li-ion battery). v in v out 0.0 1.0 2.0 3.0 4.0 5.0 0 1020 30 40 50 60 70 80 90 100110 120 130 140 150 time (minutes) battery voltage (v) 0 0.2 0.4 0.6 0.8 1 1.2 charge current (a) v dd = 5.2v r prog = 1 k ? 1200 mah li-ion battery v out i out 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 012345678910 time (minutes) battery voltage (v) 0 0.3 0.6 0.9 1.2 charge current (a) v dd = 5.2v r prog = 1 k ? 1200 mah li-ion battery v out i out 0.0 1.0 2.0 3.0 4.0 5.0 0 20 40 60 80 100 120 140 160 180 time (minutes) battery voltage (v) 0 0.02 0.04 0.06 0.08 0.1 0.12 charge current (a) v dd = 5.2v r prog = usb_low 180 mah li-ion battery v out i out 0.0 1.0 2.0 3.0 4.0 5.0 012345678910 time (minutes) battery voltage (v) 0 0.02 0.04 0.06 0.08 0.1 0.12 charge current (a) v dd = 5.2v r prog = usb_low 180 mah li-ion battery c.c. begins preconditioning c.v. begins v out i out downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 13 mcp73837/8 3.0 pin description the descriptions of the pins are listed in tab l e 3 - 1 . table 3-1: pin function table 3.1 ac adapter supply input (v ac ) a supply voltage of v reg + 0.3v to 6v from the ac/dc wall-adapter is recommended. when both the ac adapter and the usb port supply voltages are present at the same time, the ac adapter dominates the regu- lated charge current with the maximum value of 1a. bypass to v ss , with a minimum of 4.7 f, is recommended. 3.2 usb port supply input (v usb ) a supply voltage of v reg + 0.3v to 6v from the usb port is recommended. when no supply voltage from v ac pin is available, the li-ion battery is charged directly from usb port. bypass to v ss, with a minimum of 1 f, is recommended. 3.3 charge status output 1 (stat1) stat1 is an open-drain logic output for connection to a led for charge status indication. alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. 3.4 charge status output 2 (stat2) stat2 is an open-drain logic output for connection to a led for charge status indication. alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. 3.5 battery management 0v reference (v ss ) connect to the negative terminal of the battery and input supply. 3.6 ac adapter current regulation set (prog1) the ac adapter constant charge current is set by placing a resistor from prog1 to v ss . prog1 is the set point of precondition and termination when the ac adapter is present. prog1 also functions as device charge control enable. the mcp73837/8 is shut down when an impedance value greater than 70 k ? is applied to prog1. when prog1 is floating, the mcp73837/8 enters into stand-by mode. pin number symbol i/o function dfn-10 msop-10 11v ac i ac adapter supply input 22v usb i usb port supply input 3 3 stat1 o charge status output 1 (open-drain) 4 4 stat2 o charge status output 2 (open-drain) 55v ss battery management 0v reference 6 6 prog1 i/o current regulation setting with ac adapter; device charge control enable; precondition set point for ac control 7 7 prog2 i current regulation setting with usb port; precondition set point for usb control. 88 pg o available on mcp73837: power-good status output (open-drain) 88 te i available on mcp73838: timer enable; enables safety timer (active low) 9 9 therm i/o thermistor monitoring input and bias current; system test (ldo) mode input 10 10 v bat i/o battery positive input and output connection 11 ep ep (exposed thermal pad) there is an internal electrical connection between the exposed thermal pad and v ss . the ep must be connected to the same potential as the v ss pin on the pcb. downloaded from: http:///
mcp73837/8 ds20002071c-page 14 ? 2007-2015 microchip technology inc. 3.7 usb port current regulation set (prog2) the mcp73837/8 usb port current regulation set input (prog2) is a digital input selection. a logic low selects a 1 unit load charge current; a logic high selects a 5 unit loads charge current. the precondition and termi- nation current is internally set to the percentage levels selected by the device part number. the current is based on the selected unit load charge current, based on the level of prog2. prog2 also functions as the set point of termination when the usb port is present. when prog2 is float- ing, the mcp73837/8 enters into stand-by mode. 3.8 power good (pg ) power good (pg ) is available only on mcp73837. pg is an open-drain logic output for connection to an led for input power supply indication. alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. 3.9 timer enable (te ) timer enable (te ) is available only on mcp73838. te enables the built-in safety timer when it is pulled low, and disables the built-in safety timer when it is pulled high. 3.10 battery temperature monitor (therm) mcp73837/8 continuously monitors the battery temperature during a charge cycle by measuring the voltage between the therm and v ss pins. an internal 50 a current source provides the bias for the most common 10 k ? negative-temperature coefficient thermistors (ntc). 3.11 battery charge control output (v bat ) connect to the positive terminal of li-ion/li-polymer batteries. bypass to v ss, with a minimum of 1 f, to ensure loop stability when the battery is disconnected. 3.12 exposed thermal pad (ep) the 10-lead 3 x 3 mm dfn package has an exposed metal pad on the bottom of the package. it gives the device better thermal characteristics by providing a good thermal path to a pcb ground plane.there is an internal electrical connection between the ep and the v ss pin; they must be connected to the same potential on the pcb. note: the built-in safety timer is available for both mcp73837 and mcp73838 in the following options: disable, 4 hr, 6 hr, and 8 hr. downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 15 mcp73837/8 4.0 device overview the mcp73837/8 devices are simple, yet fully integrated, linear charge management controllers. figure 4-1 depicts the operational flow algorithm. figure 4-1: operational algorithm. v bat > v pth shutdown mode* v dd ? v bat - 100 mv v dd < v stop stat2 = high z pg = high z preconditioning mode charge current = i preg stat1 = low stat2 = high z pg = low timer reset fast charge mode charge current = i reg stat1 = low stat2 = high z pg = low timer enabled constant voltage mode charge voltage = v reg stat1 = low stat2 = high z pg = low charge complete mode no charge current stat1 = high z stat2 = low pg = low timer expired standby mode * v dd > (v reg + 100 mv) prog > 200 k ? stat1 = high z stat2 = high z pg = low * continuously monitored temperature fault no charge current stat1 = high z stat2 = high z pg = low timer suspended system test (ldo) mode v therm > (v dd -100 mv) stat1 = low stat2 = low pg = low timer suspended timer fault no charge current stat1 = high z stat2 = high z pg = low timer suspended timer expired stat1 = high z v bat < v pth v bat > v pth v bat = v reg v bat < v rth i bat < i term downloaded from: http:///
mcp73837/8 ds20002071c-page 16 ? 2007-2015 microchip technology inc. 4.1 undervoltage lockout (uvlo) an internal undervoltage lockout (uvlo) circuit monitors the input voltage and keeps the charger in shutdown mode until the input supply rises above the uvlo threshold. the uvlo circuitry has a built-in hysteresis of 75 mv for the usb port and 55 mv for the ac adapter. in the event a battery is present when the input power is applied, the input supply must rise 100 mv above the battery voltage before mcp73837/8 becomes operational. the uvlo circuit places the device in shutdown mode if the input supply falls to within +100 mv of the battery voltage. the uvlo circuit is always active. if, at any time, the input supply is below the uvlo threshold or within +100 mv of the voltage at the v bat pin, the mcp73837/8 is placed in a shutdown mode. during any uvlo condition, the battery reverse discharge current is less than 2 a. 4.2 autonomous power source selection the mcp73837/8 devices are designed to select the usb port or ac adapter as the power source automatically. if the ac adapter input is not present, the usb port is selected. if both inputs are available, the ac adapter has first priority. 4.3 charge qualification for a charge cycle to begin, all uvlo conditions must be met and a battery or output load must be present. a charge current programming resistor must be con- nected from prog1 to v ss . if the prog1 or prog2 pin are open or floating, the mcp73837/8 is disabled and the battery reverse discharge current is less than 2 a. in this manner, the prog1 pin acts as a charge enable and can be used as a manual shutdown. 4.4 preconditioning if the voltage at the v bat pin is less than the preconditioning threshold, the mcp73837/8 enters a preconditioning mode. the preconditioning threshold is factory set. refer to section 1.0 electrical characteristics for pre- conditioning threshold options. in this mode, the mcp73837/8 supplies a percentage of the charge current (established with the value of the resistor connected to the prog1 pin for ac mode, established by prog2 level for usb mode) to the bat- tery. the percentage or ratio of the current is factory set. refer to section 1.0 electrical characteristics for preconditioning current options. when the voltage at the v bat pin rises above the preconditioning threshold, the mcp73837/8 enters the constant current or fast charge mode. 4.5 constant current mode C fast charge during constant current mode, the programmed (ac adapter) or selected (usb port) charge current is sup- plied to the battery or load. for ac adapter, the charge current is established using a single resistor from prog1 to v ss . the program resistor and the charge current are calculated using the equation 4-1 . equation 4-1: when charging from a usb port, the host microcontroller has the option of selecting either a one-unit-load or a five-unit-loads charge rate based on the prog2 input. a logic low selects a one-unit-load charge rate, a high selects a five-unit-loads charge rate, and high impedance input suspends or disables charging. constant current mode is maintained until the voltage at the v bat pin reaches the regulation voltage, v reg . when constant current mode is invoked, the internal timer is reset. note: if the input power is switched during a charge cycle, the power path switch-over will be a break-before-make connection. as a result, the charge current can momentarily go to zero. the charge cycle timer will remain continuous. note: usb specification rev. 2.0 defines the maximum absolute current for one unit load is 100 ma. this value is not an average over time and cannot be exceeded. i reg 1000v r prog -------------------- = where: r prog = kilohm (k ?? i reg = milliampere (ma) downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 17 mcp73837/8 4.5.1 timer expired during constant current C fast charge mode if the internal timer expires before the recharge voltage threshold is reached, a timer fault is indicated and the charge cycle terminates. the mcp73837/8 remains in this condition until the battery is removed, the input battery is removed or the prog1/2 pin is opened. if the battery is removed or the prog1/2 pin is opened, the mcp73837/8 enters the stand-by mode where it remains until a battery is reinserted or the prog1/2 pin is reconnected. if the input power is removed, the mcp73837/8 is in shutdown. when the input power is reapplied, a normal start-up sequence begins. 4.6 constant voltage mode when the voltage at the v bat pin reaches the regulation voltage, v reg , constant voltage regulation begins. the regulation voltage is factory set to 4.20v, 4.35v, 4.40v, or 4.5v, with a tolerance of 0.5%. 4.7 charge termination the charge cycle is terminated when, during constant voltage mode, the average charge current diminishes below a percentage of the programmed charge current, or the internal timer has expired. a 1 ms filter time on the termination comparator ensures that transient load conditions do not result in premature charge cycle ter- mination. the percentage or ratio of the current is fac- tory set. the timer period is factory set and can be disabled. refer to section 1.0 electrical characteris- tics for charge termination current ratio and timer period options. the charge current is latched off and the mcp73837/8 enters a charge complete mode. 4.8 automatic recharge the mcp73837/8 continuously monitors the voltage at the v bat pin in the charge complete mode. if the voltage drops below the recharge threshold, another charge cycle begins and current is once again supplied to the battery or load. the recharge threshold is factory set. refer to section 1.0 electrical characteristics for recharge threshold options. 4.9 thermal regulation the mcp73837/8 limits the charge current based on the die temperature. the thermal regulation optimizes the charge cycle time while maintaining device reliability. figure 4-2 depicts the thermal regulation for the mcp73837/8. refer to section 1.0 electrical characteristics for thermal package resistances and section 6.1.1.3 thermal considerations for calculating power dissipation. . figure 4-2: thermal regulation. 4.10 thermal shutdown the mcp73837/8 suspends charge if the die temperature exceeds +150c. charging will resume when the die temperature has cooled by approximately +10c. the thermal shutdown is a secondary safety feature in the event that there is a failure within the thermal regulation circuitry. note: charge termination and automatic recharge features avoid constantly charging a li-ion battery in order to pro- long its life, while keeping its capacity at a healthy level. 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 25 35 45 55 65 75 85 95 105 115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 1 k ? downloaded from: http:///
mcp73837/8 ds20002071c-page 18 ? 2007-2015 microchip technology inc. 5.0 detailed description analog circuitry digital circuitry 5.1 analog circuitry 5.1.1 battery management input supply (v dd ) the v dd input is the input supply to the mcp73837/8. the mcp73837/8 can be supplied by either ac adapter (v ac ) or usb port (v usb ) with autonomous source selection. the mcp73837/8 automatically enters a power-down mode if the voltage on the v dd input falls to within +100 mv of the battery voltage or below the uvlo voltage (v stop ). this feature prevents draining the battery pack when both the v ac and v usb supplies are not present. 5.1.2 ac adapter current regulation set (prog1) for the mcp73837/8, the charge current regulation can be scaled by placing a programming resistor (r prog ) from the prog1 input to v ss . the program resistor and the charge current are calculated using the following equation: equation 5-1: the preconditioning current and the charge termination current are ratiometric to the fast charge current based on the selected device options. 5.1.3 battery charge control output (v bat ) the battery charge control output is the drain terminal of an internal p-channel mosfet. the mcp73837/8 provides constant current and voltage regulation to the battery pack by controlling this mosfet in the linear region. the battery charge control output should be connected to the positive terminal of the battery pack. 5.1.4 temperature qualification (therm) the mcp73837/8 continuously monitors battery temperature during a charge cycle by measuring the voltage between the therm and the v ss pins. an internal 50 a current source provides the bias for the most common 10 k ? negative-temperature coefficient (ntc) or positive-temperature coefficient (ptc) thermistors. the current source is controlled, avoiding measurement sensitivity to fluctuations in the supply voltage (v dd ). the mcp73837/8 compares the voltage at the therm pin to factory set thresholds of 1.20v and 0.25v, typically. if a voltage that is outside the thresholds is detected during a charge cycle, the mcp73837/8 immediately suspends the charge cycle. the mcp73837/8 suspends charge by turning off the pass transistor and holding the timer value. the charge cycle resumes when the voltage at the therm pin returns to the normal range. if temperature monitoring is not required, place a standard 10 k ? resistor from therm to v ss . 5.1.5 system test (ldo) mode the mcp73837/8 can be placed in a system test mode. in this mode, the mcp73837/8 operates as a low dropout (ldo) linear regulator. the output voltage is regulated to the factory set voltage regulation option. the available output current is limited to the pro- grammed fast charge current. for stability, the v bat output must be bypassed to v ss with a minimum capacitance of 1 f for output currents up to 250 ma. a minimum capacitance of 4.7 f is required for output currents above 250 ma. the system test mode is entered by driving the therm input greater than (v dd C 100 mv) with no battery connected to the output. in this mode, the mcp73837/8 can be used to power the system without a battery being present. i reg 1000v r prog ---------------- - = where: r prog = kilohm (k ?? i reg = milliampere (ma ? note 1: i therm is disabled during shutdown, stand-by, and system test modes. 2: a pull-down current source on the therm input is active only in stand-by and system test modes. 3: during system test mode, the prog input sets the available output current limit. 4: system test mode shall be exited by releasing the therm input or cycling input power. downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 19 mcp73837/8 5.2 digital circuitry 5.2.1 status indicators and power good (pg ) option the charge status outputs have two different states: low (l), and high impedance (hi-z). the charge status outputs can be used to illuminate leds. optionally, the charge status outputs can be used as an interface to a host microcontroller. tab le 5 - 1 summarizes the state of the status outputs during a charge cycle. 5.2.2 usb port current regulation select (prog2) for the mcp73837/8, driving the prog2 input to a logic low selects the low charge current setting (maximum 100 ma). driving the prog2 input to a logic high selects the high charge current setting (maximum 500 ma). the precondition current and termination current are percentages of the charge current selected by the prog2 level. the percentage is based on the selected part number of the device. 5.2.3 power good (pg ) option the power good (pg ) option is a pseudo open-drain output. it is only available on the mcp73837. the pg output can sink current, but not source current. how- ever, there is a diode path back to the input, and as such, the output should be pulled up only to the input. the pg output is low whenever the input to the mcp73837 is above the uvlo threshold and greater than the battery voltage. if the supply voltage is above the uvlo, but below v reg (typical)+0.3v, the mcp73837 will pulse the pg output as the device determines if a battery is present. 5.2.4 timer enable (te ) option the timer enable (te ) input option is used to enable or disable the internal timer. it is only available on the mcp73838. a low signal on this pin enables the inter- nal timer and a high signal disables the internal timer. the te input can be used to disable the timer when the charger is supplying current to charge the battery and power the system load. the te input is compatible with 1.8v logic. 5.2.5 device disable (prog1/2) the current regulation set input pin (prog1/2) can be used to terminate a charge at any time during the charge cycle, as well as to initiate a charge cycle or to initiate a recharge cycle. placing a programming resistor from the prog1/2 input to v ss enables the device. allowing the prog1/2 input to float or applying a logic-high input signal to prog1 disables the device and terminates a charge cycle. when disabled, the devices supply current is reduced to 75 a, typically. table 5-1: status outputs charge cycle state stat1 stat2 pg shutdown high z high z high-z standby high-z high z l preconditioning l high z l constant current l high z l constant voltage l high z l charge complete C standby high z l l temperature fault high z high z l timer fault high z high z l system test mode l l l downloaded from: http:///
mcp73837/8 ds20002071c-page 20 ? 2007-2015 microchip technology inc. 6.0 applications the mcp73837/8 devices are designed to operate in conjunction with a host microcontroller or in stand-alone applications. the mcp73837/8 devices provide the preferred charge algorithm for lithium-ion and lithium-polymer cells, constant-current followed by constant-voltage. figure 6-1 depicts a typical stand-alone mcp73837 application circuit, while figure 6-2 and figure 6-3 depict the accompanying charge profile. figure 6-1: mcp73837 typical stand-alone application circuit. figure 6-2: typical charge profile (1200 mah li-ion battery). figure 6-3: typical charge profile in thermal regulation (1200 mah li-ion battery). stat1 v ac v ss /pg v bat single li-ion cell 4 mcp73837 5 3 1 2 stat2 therm v usb prog1 prog2 usb port 6 7 hi low thermistor r prog 8 9 10 1 ?? 1 ?? 1 ?? regulated wall cube c in1 c in2 c out 0.0 1.0 2.0 3.0 4.0 5.0 0 1020 30 40 50 60 70 80 90 100110 120 130 140 150 time (minutes) battery voltage (v) 0 0.2 0.4 0.6 0.8 1 1.2 charge current (a) v dd = 5.2v r prog = 1 k ? 1200 mah li-ion battery i out v out 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 012345678910 time (minutes) battery voltage (v) 0 0.3 0.6 0.9 1.2 charge current (a) v dd = 5.2v r prog = 1 k ? 1200 mah li-ion battery v out i out downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 21 mcp73837/8 6.1 application circuit design due to the low efficiency of linear charging, the most important factors are thermal design and cost , which are a direct function of the input voltage, output current, and thermal impedance between the battery charger and the ambient cooling air. the worst-case situation is when the device has transi- tioned from the preconditioning mode to the constant current mode. in this situation, the battery charger has to dissipate the maximum power. a trade-off must be made between the charge current, cost, and thermal requirements of the charger. 6.1.1 component selection selection of the external components in figure 6-1 is crucial to the integrity and reliability of the charging system. the following discussion is intended as a guide for the component selection process. 6.1.1.1 charge current the preferred fast charge current for lithium-ion cells should always follow references and guidance from battery manufacturers. for example, programming 700 ma fast charge current for a 1000 mah li-ion battery pack if its preferred fast charge rate is 0.7c. this will result in the shortest charge cycle time without degradation of a battery's life and performance. 6.1.1.2 input over-voltage protection input over-voltage protection must be used when the input power source is hot-pluggable. this includes usb cables and wall-type power supplies. the cabling of these supplies acts as an inductor. when the supplies are connected/ disconnected from the system, large voltage transients are created which may damage the system circuitry. these transients should be snubbed out. a transzorb ? diode (unidirectional or bidirec- tional), connected from the v ac and v usb inputs to 0v ground reference, will snub the transients. an example of this can be shown in figure 6-4 . figure 6-4: input over-voltage protection example. stat1 v ac v ss /pg v bat single li-ion cell 4 mcp73837 5 3 1 2 stat2 therm v usb prog1 prog2 usb port 6 7 hi lo thermistor r prog 8 9 10 1 1 1 regulated 5v wall cube c in1 c in2 c out smaj5.0a/ac smaj5.0a/ac downloaded from: http:///
mcp73837/8 ds20002071c-page 22 ? 2007-2015 microchip technology inc. 6.1.1.3 thermal considerations the worst-case power dissipation in the battery char- ger occurs when the input voltage is at the maximum and the device has transitioned from the preconditioning mode to the constant-current mode. in this case, the power dissipation is: equation 6-1: for example, power dissipation with a 5v, 10% input voltage source, and a 500 ma, 10% fast charge current is calculated in the following example: example 6-1: this power dissipation with the battery charger in the msop-10 package will cause thermal regulation to be entered as depicted in figure 6-3 . alternatively, the 3 mm x 3 mm dfn package could be utilized to reduce the charge cycle times. 6.1.1.4 external capacitors the mcp73837/8 is stable with or without a battery load. in order to maintain good ac stability in the con- stant voltage mode, a minimum capacitance of 1 f is recommended to bypass the v bat pin to v ss . this capacitance provides compensation when there is no battery load. in addition, the battery and interconnec- tions appear inductive at high frequencies. these ele- ments are in the control feedback loop during constant voltage mode. therefore, the bypass capacitance may be necessary to compensate for the inductive nature of the battery pack. virtually any good quality output filter capacitor can be used, independent of the capacitors minimum effec- tive series resistance (esr) value. the actual value of the capacitor (and its associated esr) depends on the output load current. a 1 f ceramic, tantalum, or alumi- num electrolytic capacitor at the output is usually suffi- cient to ensure stability for output currents up to 500 ma. 6.1.1.5 reverse-blocking protection the mcp73837/8 provides protection from a faulted or shorted input. without the protection, a faulted or shorted input would discharge the battery pack through the body diode of the internal pass transistor. 6.1.1.6 charge inhibit the current regulation set input pin (prog1/2) can be used to terminate a charge at any time during the charge cycle, as well as to initiate a charge cycle or a recharge cycle. placing a programming resistor from the prog1 input to v ss or driving prog2 to logic high or low enables the device. allowing either the prog1/2 input to float disables the device and terminates a charge cycle. when disabled, the devices supply current is reduced to 75 a, typically. 6.1.1.7 temperature monitoring the charge temperature window can be set by placing fixed value resistors in series-parallel with a thermistor. the resistance values of r t1 and r t2 can be calculated with the following equations in order to set the temperature window of interest. for ntc thermistors, see equation 6-2 . equation 6-2: for example, by utilizing a 10 k ? at +25c ntc thermistor with a sensitivity index, ? , of 3892, the charge temperature range can be set to 0c C +50c by placing a 1.54 k ? resistor in series (r t1 ), and a 69.8 k ? resistor in parallel (r t2 ) with the thermistor. 6.1.1.8 charge status interface a status output provides information on the state of charge. the output can be used to illuminate external leds or interface to a host microcontroller. refer to table 5-1 or figure 4-1 for information on the state of the status output during a charge cycle. powerdissipation v ddmax v pthmin ? ?? i regmax ? = where: v ddmax = the maximum input voltage i regmax = the maximum fast charge current v pthmin = the minimum transition threshold voltage powerdissipation 5.5v 2.7v ? ?? 550 ma ? 1.54w == 24k ? r t1 r t2 r cold ? r t2 r+ cold --------------------------------- + = 5k ? r t1 r t2 r hot ? r t2 r+ hot ----------------------------- - + = where: r t1 = the fixed series resistance r t2 = the fixed parallel resistance r cold = the thermistor resistance at the lower temperature of interest r hot = the thermistor resistance at the upper temperature of interest downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 23 mcp73837/8 6.2 pcb layout issues for optimum voltage regulation, place the battery pack as close as possible to the devices v bat and v ss pins. this is recommended to minimize voltage drops along the high-current-carrying pcb traces. if the pcb layout is used as a heat sink, adding many vias in the heatsink pad can help conduct more heat to the backplane of the pcb, thus reducing the maximum junction temperature. downloaded from: http:///
mcp73837/8 ds20002071c-page 24 ? 2007-2015 microchip technology inc. 7.0 packaging information 7.1 package marking information 10-lead dfn 10-lead msop example: example: legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week 01) nnn alphanumeric traceability code pb-free jedec designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e part number ( 1 ) marking code part number ( 1 ) marking code mcp73837-fci/mf baba mcp73837t-fci/mf baba mcp73837-fji/mf babb mcp73837t-fji/mf babb mcp73837-nvi/mf babc mcp73837t-nvi/mf babc mcp73838-fci/mf baca mcp73838t-fci/mf baca mcp73838-fji/mf bacb mcp73838t-fji/mf bacb mcp73838-nvi/mf bacc mcp73838t-nvi/mf bacc part number ( 1 ) marking code part number ( 1 ) marking code mcp73837-fci/un 837fci mcp73837t-fci/un 837fci mcp73837-fji/un 837fji mcp73837t-fji/un 837fji mcp73837-nvi/un 837nvi mcp73837t-nvi/un 837nvi mcp73838-fci/un 838fci mcp73838t-fci/un 838fci mcp73838-fji/un 838fji mcp73838t-fjii/un 838fji mcp73838-nvi/un 838nvi mcp73838t-nvi/un 838nvi mcp73838-ami/un 838ami mcp73838t-ami/un 838ami baba 1539 256 837fci 539256 note 1: consult factory for alternative device options. 2: consult factory for msop package availability. ( 2 ) downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 25 mcp73837/8 note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
mcp73837/8 ds20002071c-page 26 ? 2007-2015 microchip technology inc. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 27 mcp73837/8 note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
mcp73837/8 ds20002071c-page 28 ? 2007-2015 microchip technology inc. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging un downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-page 29 mcp73837/8 note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging un downloaded from: http:///
mcp73837/8 ds20002071c-page 30 ? 2007-2015 microchip technology inc. 10-lead plastic micro small outline package (un) [msop] note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-p age 3 1 mcp73837/8 appendix a: revision history revision c (november 2015) the following is the list of modifications: 1. added section 6.1.1.2 input over-voltage protection . 2. added figure 6-4 . 3. added cn output option to operational out- put options table in product identification system . 4. minor typographical errors. revision b (december 2011) the following is the list of modifications: 1. updated the functional block diagram on page 3. 2. added labels on the charts throughout section 2.0 typical performance curves . 3. updated text in section 3.7 usb port current regulation set (prog2) . 4. updated text in section 4.4 precondition- ing . 5. updated text in section 5.2.2 usb port current regulation select (prog2) . 6. added labels in figure 6-2 and figure 6-3 . revision a (november 2007) original release of this document. downloaded from: http:///
mcp73837/8 ds20002071c-page 3 2 ? 2007-2015 microchip technology inc. notes: downloaded from: http:///
? 2007-2015 microchip technology inc. ds20002071c-p age 3 3 mcp73837/8 product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . operational output options output options v reg i preg /i reg v pth /v reg i term /i reg v rth /v reg timer period am 4.20v 10% 71.5% 7.5% 96.5% 0 hours bz 4.20v 100% n/a 7.5% 96.5% 0 hours fc 4.20v 10% 71.5% 7.5% 96.5% 6 hours gp 4.20v 100% n/a 7.5% 96.5% 6 hours g8 4.20v 10% 71.5% 7.5% 96.5% 8 hours nv 4.35v 10% 71.5% 7.5% 96.5% 6 hours ya 4.40v 10% 71.5% 7.5% 96.5% 6 hours 6s 4.50v 10% 71.5% 7.5% 96.5% 6 hours b6 4.20v 10% 66.5% 5.0% 96.5% 4 hours cn 4.20v 10% 71.5% 20% 94% 4 hours fj 4.20v 10% 71.5% 20% 94% 6 hours device: mcp73837: 1a fully integrated charger, pg function on pin 8 mcp73837t: 1a fully integrated charger, pg function on pin 8 (tape and reel) mcp73838: 1a fully integrated charger, te function on pin 8 mcp73838t: 1a fully integrated charger, te function on pin 8 (tape and reel) output options ( 1 ) refer to operational output options table for different operational output options. temperature: i = -40 ? c to +85 ? c package type: mf = 10-lead plastic dual flat, no lead package 3x3x0.9mm body, dfn un = 10-lead plastic micro small outline package, msop ( 2 ) part no. xx output device options* x/ temp. xx package examples ( 1 ) : a) mcp73837-fci/mf: 10-lead dfn package b) mcp73837-fji/mf: 10-lead dfn package c) mcp73837-nvi/mf: 10-lead dfn package d) mcp73837t-fci/mf: 10-lead dfn package, tape and reel e) mcp73837t-fji/mf: 10-lead dfn package, tape and reel f) mcp73837t-nvi/mf: 10-lead dfn package, tape and reel g) mcp73837-fci/un: 10-lead msop package h) mcp73837-fji/un: 10-lead msop package i) mcp73837-nvi/un: 10-lead msop package j) mcp73837t-fci/un: 10-lead msop package tape and reel k) mcp73837t-fji/un: 10-lead msop package tape and reel l) mcp73837t-nvi/un: 10-lead msop package tape and reel a) mcp73838-fci/mf: 10-lead dfn package b) mcp73838-fji/mf: 10-lead dfn package c) mcp73838-nvi/mf: 10-lead dfn package d) mcp73838t-fci/mf: 10-lead dfn package tape and reel e) mcp73838t-fji/mf: 10-lead dfn package tape and reel f) mcp73838t-nvi/mf: 10-lead dfn package tape and reel g) mcp73838-ami/un: 10-lead msop package h) mcp73838-fci/un: 10-lead msop package i) mcp73838-fji/un: 10-lead msop package j) mcp73838-nvi/un: 10-lead msop package k) mcp73838t-ami/un: 10-lead msop package tape and reel l) mcp73838t-fci/un: 10-lead msop package tape and reel m) mcp73838t-fji/un: 10-lead msop package tape and reel n) mcp73838t-fci/un: 10-lead msop package tape and reel note 1: consult the factory for alternative device options. 2: consult the factory for msop package availability. downloaded from: http:///
mcp73837/8 ds20002071c-page 3 4 ? 2007-2015 microchip technology inc. notes: downloaded from: http:///
? 2011-2015 microchip technology inc. ds20002071c-p age 3 5 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyers risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights unless otherwise stated. trademarks the microchip name and logo, the microchip logo, dspic, flashflex, flexpwr, jukeblox, k ee l oq , k ee l oq logo, kleer, lancheck, medialb, most, most logo, mplab, optolyzer, pic, picstart, pic 32 logo, righttouch, spynic, sst, sst logo, superflash and uni/o are registered trademarks of microchip tec hnology incorporated in the u.s.a. and other countries. the embedded control solutions company and mtouch are registered trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, ecan, in-circuit serial programming, icsp, inter-chip connectivity, kleernet, kleernet logo, miwi, motorbench, mpasm, mpf, mplab certified logo, mplib, mplink, multitrak, netdetach, omniscient code generation, picdem, picdem.net, pickit, pictail, righttouch logo, real ice, sqi, serial quad i/o, total endurance, tsharc, usbcheck, varisense, viewspan, wiperlock, wireless dna, and zena are trademarks of microchip tec hnology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. gestic is a registered trademark of microchip technology germany ii gmbh & co. kg, a subsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2011-2015, microchip technology incorporated, printed in the u.s.a., all rights reserved. isbn: 978-1-63277-879-6 note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n th e i ntended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specif ications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchips code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory an d analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified. quality management s ystem certified by dnv == iso/ts 16949 == downloaded from: http:///
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