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? 2006 microchip technology inc. ds21984b-page 1 MCP73831/2 features: ? linear charge management controller: - integrated pass transistor - integrated current sense - reverse discharge protection ? high accuracy preset voltage regulation: + 0.75% ? four voltage regulation options: - 4.20v, 4.35v, 4.40v, 4.50v ? programmable charge current ? selectable preconditioning ? selectable end-of-charge control ? charge status output - tri-state output - MCP73831 - open-drain output - mcp73832 ? automatic power-down ? thermal regulation ? temperature range: -40c to +85c ? packaging: - 8-lead, 2 mm x 3 mm dfn - 5-lead, sot23 applications: ? lithium-ion/lithium-polymer battery chargers ? personal data assistants ? cellular telephones ?digital cameras ? mp3 players ? bluetooth headsets ? usb chargers typical application description: the MCP73831/2 devices are highly advanced linear charge management controllers for use in space-lim- ited, cost-sensitive applications. the MCP73831/2 are available in an 8-lead, 2 mm x 3 mm dfn package or a 5-lead, sot23 package. along with their small physical size, the low number of external components required make the MCP73831/2 ideally suited for por- table applications. for applications charging from a usb port, the MCP73831/2 adhere to all the specifications governing the usb power bus. the MCP73831/2 employ a constant-current/constant- voltage charge algorithm with selectable precondition- ing and charge termination. the constant voltage regulation is fixed with four available options: 4.20v, 4.35v, 4.40v or 4.50v, to accommodate new, emerg- ing battery charging requirements. the constant cur- rent value is set with one external resistor. the MCP73831/2 devices limit the charge current based on die temperature during high power or high ambient conditions. this thermal regulation optimizes the charge cycle time while maintaining device reliability. several options are available for the preconditioning threshold, preconditioning current value, charge termi- nation value and automatic recharge threshold. the preconditioning value and charge termination value are set as a ratio, or percentage, of the programmed constant current value. preconditioning can be dis- abled. refer to section 1.0 ?electrical characteris- tics? for available options and the ?product identification system? for standard options. the MCP73831/2 devices are fully specified over the ambient temperature range of -40c to +85c. package types stat v dd v ss prog v bat + - single li-ion cell 4 MCP73831 5 3 1 500 ma li-ion battery charger 2 v in 4.7 f 470 2k 4.7 f sot23-5 v bat v ss v dd 1 2 3 5 4 prog stat 8-lead dfn 1 2 3 4 8 7 6 5 v dd v bat v bat v dd nc prog v ss stat (2 mm x 3 mm) miniature single-cell, fully integrated li-ion, li-polymer charge management controllers
MCP73831/2 ds21984b-page 2 ? 2006 microchip technology inc. functional block diagram + - reference generator v ref (1.22v) v bat v dd stat prog v bat g=0.001 v ss direction control 477 k 255 k uvlo + - + - shdn direction control 0.5 ma precondition 6ma 6ma + - termination + - 43.6 k + - ca 3.9 k 111 k 190 k 7k 15 k 182.3 k 111 k charge + - + - va 89 k 361 k 100 k 0.5 ma v dd MCP73831 only
? 2006 microchip technology inc. ds21984b-page 3 MCP73831/2 1.0 electrical characteristics absolute maximum ratings? v dd ...................................................................................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) .............400v ? 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 specification 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 (typ.) + 0.3v] to 6v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typ.) + 1.0v] parameters sym. min. typ. max. units conditions supply input supply voltage v dd 3.75 ? 6 v supply current i ss ? 510 1500 a charging ? 53 200 a charge complete, no battery ?2550 a prog floating ?1 5 av dd < (v bat - 50 mv) ?0.1 2 av dd < v stop uvlo start threshold v start 3.3 3.45 3.6 v v dd low-to-high uvlo stop threshold v stop 3.2 3.38 3.5 v v dd high-to-low uvlo hysteresis v hys ?70?mv voltage regulation (constant-voltage mode) regulated output voltage v reg 4.168 4.20 4.232 v mcp7383x-2 4.317 4.35 4.383 v mcp7383x-3 4.367 4.40 4.433 v mcp7383x-4 4.466 4.50 4.534 v mcp7383x-5 v dd = [v reg (typ)+1v] i out = 10 ma t a = -5c to +55c line regulation |( v bat /v bat )/ v dd | ? 0.09 0.30 %/v v dd = [v reg (typ)+1v] to 6v i out = 10 ma load regulation | v bat /v bat | ? 0.05 0.30 % i out = 10 ma to 50 ma v dd = [v reg (typ)+1v] supply ripple attenuation psrr ? 52 ?- db i out =10 ma, 10hz to 1 khz ?47?dbi out =10 ma, 10hz to 10 khz ?22?dbi out =10 ma, 10hz to 1 mhz current regulation (fast charge constant-current mode) fast charge current regulation i reg 90 100 110 ma prog = 10 k 450 505 550 ma prog = 2.0 k , note 1 t a = -5c to +55c note 1: not production tested. ensured by design.
MCP73831/2 ds21984b-page 4 ? 2006 microchip technology inc. preconditioning current regulation (trickle charge constant-current mode) precondition current ratio i preg / i reg 7.5 10 12.5 % prog = 2.0 k to 10 k 15 20 25 % prog = 2.0 k to 10 k 30 40 50 % prog = 2.0 k to 10 k ? 100 ? % no preconditioning t a = -5c to +55c precondition voltage threshold ratio v pth / v reg 64 66.5 69 % v bat low-to-high 69 71.5 74 % v bat low-to-high precondition hysteresis v phys ?110?mvv bat high-to-low charge termination charge termination current ratio i term / i reg 3.75 5 6.25 % prog = 2.0 k to 10 k 5.6 7.5 9.4 % prog = 2.0 k to 10 k 7.5 10 12.5 % prog = 2.0 k to 10 k 15 20 25 % prog = 2.0 k to 10 k t a = -5c to +55c automatic recharge recharge voltage threshold ratio v rth / v reg 91.5 94.0 96.5 % v bat high-to-low 94 96.5 99 % v bat high-to-low pass transistor on-resistance on-resistance r dson ?350?m v dd = 3.75v, t j = 105c battery discharge current output reverse leakage current i discharge ?0.15 2 a prog floating ?0.25 2 av dd floating ?0.15 2 av dd < v stop ? -5.5 -15 a charge complete status indicator ? stat sink current i sink ??25ma low output voltage v ol ?0.4 1vi sink = 4 ma source current i source ??35ma high output voltage v oh ?v dd -0.4 v dd - 1 v i source = 4 ma (MCP73831) input leakage current i lk ?0.03 1 a high-impedance prog input charge impedance range r prog 2?20k minimum shutdown impedance r prog 70 ? 200 k automatic power down automatic power down entry threshold v pdenter v dd <(v bat +20mv) v dd <(v bat +50mv) ?3.5v v bat v reg v dd falling automatic power down exit threshold v pdexit ?v dd <(v bat +150mv) v dd <(v bat +200mv) 3.5v v bat v reg v dd rising thermal shutdown die temperature t sd ?150? c die temperature hysteresis t sdhys ?10? c dc characteristics (continued) electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ.) + 0.3v] to 6v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typ.) + 1.0v] parameters sym. min. typ. max. units conditions note 1: not production tested. ensured by design.
? 2006 microchip technology inc. ds21984b-page 5 MCP73831/2 temperature specifications ac characteristics electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ.) + 0.3v] to 12v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typ.) + 1.0v] parameters sym. min. typ. max. units conditions uvlo start delay t start ?? 5 msv dd low-to-high constant-current regulation transition time out of preconditioning t delay ?? 1 msv bat < v pth to v bat > v pth current rise time out of preconditioning t rise ?? 1 msi out rising to 90% of i reg termination comparator filter t term 0.4 1.3 3.2 ms average i out falling charge comparator filter t charge 0.4 1.3 3.2 ms average v bat status indicator status output turn-off t off ??200 si sink = 1 ma to 0 ma status output turn-on t on ??200 si sink = 0 ma to 1 ma electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ.) + 0.3v] to 12v. 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 5-lead, sot23 ja ? 230 ? c/w 4-layer jc51-7 standard board, natural convection 8-lead, 2 mm x 3 mm, dfn ja ? 76 ? c/w 4-layer jc51-7 standard board, natural convection
MCP73831/2 ds21984b-page 6 ? 2006 microchip technology inc. 2.0 typical performance curves note: unless otherwise indicated, v dd = [v reg (typ.) + 1v], i out = 10 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: charge current (i out ) vs. programming resistor (r prog ). figure 2-5: charge current (i out ) vs. supply voltage (v dd ). figure 2-6: charge current (i out ) vs. supply voltage (v dd ). 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. 4.170 4.175 4.180 4.185 4.190 4.195 4.200 4.205 4.210 4.50 4.75 5.00 5.25 5.50 5.75 6.00 supply voltage (v) battery regulation voltage (v) MCP73831-2 i out = 10 ma i out = 100 ma i out = 450 ma 4.170 4.175 4.180 4.185 4.190 4.195 4.200 4.205 4.210 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 ambient temperature (c) battery regulation voltage (v) MCP73831-2 i out = 10 ma i out = 100 ma i out = 450 ma 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 3.00 3.20 3.40 3.60 3.80 4.00 4.20 battery regulation voltage (v) output leakage current (a) +85c -40c +25c 0 50 100 150 200 250 300 350 400 450 500 550 2 4 6 8 10 12 14 16 18 20 programming resistor (k ? ) charge current (ma) 96 97 98 99 100 101 102 103 104 4.50 4.75 5.00 5.25 5.50 5.75 6.00 supply voltage (v) charge current (ma) r prog = 10 k ? 500 502 504 506 508 510 512 514 516 4.50 4.75 5.00 5.25 5.50 5.75 6.00 supply voltage (v) charge current (ma) r prog = 2 k ?
? 2006 microchip technology inc. ds21984b-page 7 MCP73831/2 typical performance curves (continued) note: unless otherwise indicated, v dd = [v reg (typ.) + 1v], i out = 10 ma and t a = +25c, constant-voltage mode. figure 2-7: charge current (i out ) vs. ambient temperature (t a ). figure 2-8: charge current (i out ) vs. ambient temperature (t a ). figure 2-9: charge current (i out ) vs. junction temperature (t j ). figure 2-10: charge current (i out ) vs. junction temperature (t j ). figure 2-11: power supply ripple rejection (psrr). figure 2-12: power supply ripple rejection (psrr). 96 97 98 99 100 101 102 103 104 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 ambient temperature (c) charge current (ma) r prog = 10 k ? 500 502 504 506 508 510 512 514 516 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 ambient temperature (c) charge current (ma) r prog = 2 k ? 0 15 30 45 60 75 90 105 120 25 35 45 55 65 75 85 95 105 115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 10 k ? 0 75 150 225 300 375 450 525 25 35 45 55 65 75 85 95 105 115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 2 k ? -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency (khz) attenuation (db) v ac = 100 mvp-p i out = 10 ma c out = 4.7 f, x7r ceramic -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency (khz) attenuation (db) v ac = 100 mvp-p i out = 100 ma c out = 4.7 f, x7r ceramic
MCP73831/2 ds21984b-page 8 ? 2006 microchip technology inc. typical performance curves (continued) note: unless otherwise indicated, v dd = [v reg (typ.) + 1v], i out = 10 ma and t a = +25c, constant-voltage mode. figure 2-13: line transient response. figure 2-14: line transient response. figure 2-15: load transient response. figure 2-16: load transient response. figure 2-17: complete charge cycle (180 mah li-ion battery). figure 2-18: complete charge cycle (1000 mah li-ion battery). -2 0 2 4 6 8 10 12 14 0 20 40 60 80 100 120 140 160 180 200 time (s) source voltage (v) -0.30 -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 output ripple (v) i out = 10 ma c out = 4.7 f, x7r ceramic -2 0 2 4 6 8 10 12 14 0 20 40 60 80 100 120 140 160 180 200 time (s) source voltage (v) -0.30 -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 output ripple (v) i out = 100 ma c out = 4.7 f, x7r ceramic -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0 20 40 60 80 100 120 140 160 180 200 time (s) output current (a) -0.12 -0.10 -0.08 -0.06 -0.04 -0.02 0.00 0.02 0.04 output ripple (v) c out = 4.7 f, x7r ceramic -0.20 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 0 20 40 60 80 100 120 140 160 180 200 time (s) output current (a) -0.30 -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 output ripple (v) c out = 4.7 f, x7r ceramic 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0 20 40 60 80 100 120 140 160 180 time (minutes) battery voltage (v) 0 20 40 60 80 100 120 charge current (ma) MCP73831-2ac/iot v dd = 5.2v r prog = 10 k ? 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0 30 60 90 120 150 180 210 240 time (minutes) battery voltage (v) 0 100 200 300 400 500 600 charge current (ma) MCP73831-2ac/iot v dd = 5.2v r prog = 2 k ?
? 2006 microchip technology inc. ds21984b-page 9 MCP73831/2 3.0 pin description the descriptions of the pins are listed in table 3-1. table 3-1: pin function tables 3.1 battery management input supply (v dd ) a supply voltage of [v reg (typ.) + 0.3v] to 6v is recommended. bypass to v ss with a minimum of 4.7 f. 3.2 battery charge control output (v bat ) connect to positive terminal of battery. drain terminal of internal p-channel mosfet pass transistor. bypass to v ss with a minimum of 4.7 f to ensure loop stability when the battery is disconnected. 3.3 charge status output (stat) stat is an output for connection to an led for charge status indication. alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. stat is a tri-state logic output on the MCP73831 and an open-drain output on the mcp73832. 3.4 battery management 0v reference (v ss ) connect to negative terminal of battery and input supply. 3.5 current regulation set (prog) preconditioning, fast charge and termination currents are scaled by placing a resistor from prog to v ss . the charge management controller can be disabled by allowing the prog input to float. pin no. symbol function dfn sot23-5 14 v dd battery management input supply 2? v dd battery management input supply 33 v bat battery charge control output 4? v bat battery charge control output 5 1 stat charge status output 62 v ss battery management 0v reference 7 ? nc no connection 8 5 prog current regulation set and charge control enable
MCP73831/2 ds21984b-page 10 ? 2006 microchip technology inc. 4.0 device overview the MCP73831/2 are highly advanced linear charge management controllers. figure 4-1 depicts the operational flow algorithm from charge initiation to completion and automatic recharge. figure 4-1: flowchart. 4.1 under voltage lockout (uvlo) an internal 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 100 mv. in the event a battery is present when the input power is applied, the input supply must rise 150 mv above the battery voltage before the MCP73831/2 becomes operational. the uvlo circuit places the device in shutdown mode if the input supply falls to within +50 mv of the battery voltage. again, the input supply must rise to a level 150 mv above the battery voltage before the MCP73831/2 become operational. the uvlo circuit is always active. at any time the input supply is below the uvlo threshold or within +50 mv of the voltage at the v bat pin, the MCP73831/2 are placed in a shutdown mode. during any uvlo condition, the battery reverse discharge current shall be less than 2 a. 4.2 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 connected from prog to v ss . if the prog pin is open or floating, the MCP73831/2 are disabled and the battery reverse discharge current is less than 2 a. in this manner, the prog pin acts as a charge enable and can be used as a manual shutdown. 4.3 preconditioning if the voltage at the v bat pin is less than the precondi- tioning threshold, the MCP73831/2 enter a precondi- tioning or trickle charge mode. the preconditioning threshold is factory set. refer to section 1.0 ?electri- cal characteristics? for preconditioning threshold options and the product identification system for standard options. in this mode, the MCP73831/2 supply a percentage of the charge current (established with the value of the resistor connected to the prog pin) to the battery. the percentage or ratio of the current is factory set. refer to section 1.0 ?electrical characteristics? for preconditioning current options and the product identification system for standard options. when the voltage at the v bat pin rises above the preconditioning threshold, the MCP73831/2 enter the constant-current or fast charge mode. 4.4 fast charge constant-current mode during the constant-current mode, the programmed charge current is supplied to the battery or load. the charge current is established using a single resistor from prog to v ss . constant-current mode is maintained until the voltage at the v bat pin reaches the regulation voltage, v reg . shutdown mode v dd < v uvlo v dd < v bat or prog > 200 k stat = hi-z preconditioning mode charge current = i preg stat = low fast charge mode charge current = i reg stat = low constant voltage mode charge voltage = v reg stat = low v bat < v pth v bat > v pth v bat = v reg v bat < v rth v bat > v pth i bat < i term charge complete mode no charge current stat = high (MCP73831) stat = hi-z (mcp73832)
? 2006 microchip technology inc. ds21984b-page 11 MCP73831/2 4.5 constant-voltage mode when the voltage at the v bat pin reaches the regula- tion voltage, v reg , constant voltage regulation begins. the regulation voltage is factory set to 4.2v, 4.35v, 4.40v, or 4.50v with a tolerance of 0.75%. 4.6 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 (established with the value of the resistor connected to the prog pin). a 1 ms filter time on the termination comparator ensures that transient load conditions do not result in premature charge cycle termination. the percentage or ratio of the current is factory set. refer to section 1.0 ?electrical characteristics? for charge termination current options and the ?product identification system? for standard options. the charge current is latched off and the MCP73831/2 enter a charge complete mode. 4.7 automatic recharge the MCP73831/2 continuously monitor the voltage at the v bat pin in the charge complete mode. if the volt- age 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 char- acteristics? for recharge threshold options and the product identification system for standard options. 4.8 thermal regulation the MCP73831/2 limit 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 MCP73831/2. figure 4-2: thermal regulation. 4.9 thermal shutdown the MCP73831/2 suspend charge if the die tempera- ture exceeds 150c. charging will resume when the die temperature has cooled by approximately 10c. 0 75 150 225 300 375 450 525 25 35 45 55 65 75 85 95 105 115 125 135 145 155 junction temperature (c) charge current (ma) r prog = 2 k
MCP73831/2 ds21984b-page 12 ? 2006 microchip technology inc. 5.0 detailed description 5.1 analog circuitry 5.1.1 battery management input supply (v dd ) the v dd input is the input supply to the MCP73831/2. the MCP73831/2 automatically enter a power-down mode if the voltage on the v dd input falls below the uvlo voltage (v stop ). this feature prevents draining the battery pack when the v dd supply is not present. 5.1.2 current regulation set (prog) fast charge current regulation can be scaled by plac- ing a programming resistor (r prog ) from the prog input to v ss . the program resistor and the charge current are calculated using the following equation: the preconditioning trickle charge 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 MCP73831/2 provide 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. 5.2 digital circuitry 5.2.1 status indicator (stat) the charge status output of the MCP73831 has three different states: high (h), low (l), and high-imped- ance (hi-z). the charge status output of the mcp73832 is open-drain, and, as such, has two differ- ent states: low (l), and high-impedance (hi-z). the charge charge status output can be used to illuminate 1, 2, or tri-color leds. optionally, the charge status output can be used as an interface to a host microcontroller. table 5-1 summarize the state of the status output during a charge cycle.. 5.2.2 device disable (prog) the current regulation set input pin (prog) can be used to terminate a charge at any time during the charge cycle, as well as to initiate a charge cycle or initiate a recharge cycle. placing a programming resistor from the prog input to v ss enables the device. allowing the prog input to float or by applying a logic-high input signal, disables the device and terminates a charge cycle. when disabled, the device?s supply current is reduced to 25 a, typically. i reg 1000 v r prog ---------------- - = where: r prog =kohms i reg = milliampere table 5-1: status output charge cycle state stat1 MCP73831 mcp73832 shutdown hi-z hi-z no battery present hi-z hi-z preconditioning l l constant-current fast charge ll constant voltage l l charge complete ? standby hhi-z
? 2006 microchip technology inc. ds21984b-page 13 MCP73831/2 6.0 applications the MCP73831/2 are designed to operate in conjunc- tion with a host microcontroller or in a stand-alone application. the MCP73831/2 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 application circuit, while figures 6-2 and 6-3 depict the accompanying charge profile. figure 6-1: typical application circuit. figure 6-2: typical charge profile (180 mah battery). figure 6-3: typical charge profile in thermal regulation (1000 mah battery). 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 transitioned 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 current programming resistor (r prog ) the preferred fast charge current for lithium-ion cells is at the 1c rate, with an absolute maximum current at the 2c rate. for example, a 500 mah battery pack has a preferred fast charge current of 500 ma. charging at this rate provides the shortest charge cycle times without degradation to the battery pack performance or life. stat v dd v ss prog v bat + - single li-ion cell 4 MCP73831 5 3 1 c in li-ion battery charger 2 r prog r led c out regulated wall cube led 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0 20 40 60 80 100 120 140 160 180 time (minutes) battery voltage (v) 0 20 40 60 80 100 120 charge current (ma) MCP73831-2ac/iot v dd = 5.2v r prog = 10 k ? 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0 30 60 90 120 150 180 210 240 time (minutes) battery voltage (v) 0 100 200 300 400 500 600 charge current (ma) MCP73831-2ac/iot v dd = 5.2v r prog = 2 k ?
MCP73831/2 ds21984b-page 14 ? 2006 microchip technology inc. 6.1.1.2 thermal considerations the worst-case power dissipation in the battery charger 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: power dissipation with a 5v, 10% input voltage source is: this power dissipation with the battery charger in the sot23-5 package will cause thermal regulation to be entered as depicted in figure 6-3. alternatively, the 2mm x 3mm dfn package could be utilized to reduce charge cycle times. 6.1.1.3 external capacitors the MCP73831/2 are stable with or without a battery load. in order to maintain good ac stability in the con- stant-voltage mode, a minimum capacitance of 4.7 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 elements are in the control feedback loop during constant-voltage mode. therefore, the bypass capac- itance 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 capacitor?s minimum effective series resistance (esr) value. the actual value of the capacitor (and its associated esr) depends on the output load current. a 4.7 f ceramic, tantalum or aluminum electrolytic capacitor at the output is usually sufficient to ensure stability for output currents up to a 500 ma. 6.1.1.4 reverse-blocking protection the MCP73831/2 provide 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. 6.1.1.5 charge inhibit the current regulation set input pin (prog) can be used to terminate a charge at any time during the charge cycle, as well as to initiate a charge cycle or initiate a recharge cycle. placing a programming resistor from the prog input to v ss enables the device. allowing the prog input to float or by applying a logic-high input signal, disables the device and terminates a charge cycle. when disabled, the device?s supply current is reduced to 25 a, typically. 6.1.1.6 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 for a summary of the state of the status output during a charge cycle. 6.2 pcb layout issues for optimum voltage regulation, place the battery pack as close as possible to the device?s 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 heatsink, adding many vias in the heatsink pad can help conduct more heat to the backplane of the pcb, thus reducing the maximum junction temperature. figures 6-4 and 6-5 depict a typical layout with pcb heatsinking. figure 6-4: typical layout (top). figure 6-5: typical layout (bottom). 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 5.5 v 2.7 v ? () 550 ma 1.54 w == c out led r prog c in MCP73831 r led v bat v dd v ss v bat v ss v dd
? 2006 microchip technology inc. ds21984b-page 15 MCP73831/2 7.0 packaging information 7.1 package marking information 5-lead sot-23 example: xxnn kd25 8-lead dfn (2 mm x 3 mm) example: xxx yww nn aae 610 25 device code MCP73831t-2aci/mc aae MCP73831t-2ati/mc aaf MCP73831t-2dci/mc aag MCP73831t-3aci/mc aah MCP73831t-4adi/mc aaj MCP73831t-5aci/mc aak mcp73832t-2aci/mc aal mcp73832t-2ati/mc aam mcp73832t-2dci/mc aap mcp73832t-3aci/mc aaq mcp73832t-4adi/mc aar mcp73832t-5aci/mc aas note: applies to 8-lead dfn device code MCP73831t-2aci/ot kdnn MCP73831t-2ati/ot kenn MCP73831t-2dci/ot kfnn MCP73831t-3aci/ot kgnn MCP73831t-4adi/ot khnn MCP73831t-5aci/ot kjnn mcp73832t-2aci/ot kknn mcp73832t-2ati/ot klnn mcp73832t-2dci/ot kmnn mcp73832t-3aci/ot kpnn mcp73832t-4adi/ot kqnn mcp73832t-5aci/ot krnn note: applies to 5-lead sot-23 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
MCP73831/2 ds21984b-page 16 ? 2006 microchip technology inc. 8-lead plastic dual-flat, no-lead package (mc) 2x3x0.9 mm body (dfn) ? saw singulated l e2 a3 a1 a top view d e exposed pad metal d2 bottom view 2 1 bp n ( note 3 ) exposed tie bar pin 1 ( note 1 ) id index area ( note 2 ) configuration contact alternate detail k 3. package may have one or more exposed tie bars at ends. bsc: basic dimension. theoretically exact value shown without tolerances. ref: reference dimension, usually without tolerance, for information purposes only. jedec equivalent mo-229 vced-2 see asme y14.5m see asme y14.5m millimeters * 0.50 bsc 2.00 bsc 0.20 ref. 3.00 bsc 1. pin 1 visual index feature may vary, but must be located within the hatched area. .039 .035 .031 0.80 a overall height 2. exposed pad may vary according to die attach paddle size. * controlling parameter contact length notes: contact width standoff overall width overall length contact thickness exposed pad width exposed pad length .010 .008 l b .012 0.20 .001 .008 ref. .079 bsc ? ? .118 bsc d .051 .059 d2 e2 e .000 a3 a1 .069 .075 1.30 ** 1.50 ** .002 0.00 dimension limits pitch number of pins inches .020 bsc min n e nom units 8 max min 1.00 0.90 0.25 0.30 ? ? 1.75 1.90 0.02 0.05 8 nom max contact-to-exposed pad .012 k .016 0.40 .020 0.30 0.50 ** not within jedec parameters significant characteristic .008 ? ? 0.20 ? ? dwg no. c04-123 revised 09-12-05
? 2006 microchip technology inc. ds21984b-page 17 MCP73831/2 5-lead plastic small outline transistor (ot) (sot-23) 1 p d b n e e1 l c a2 a a1 p1 10 5 0 10 5 0 b mold draft angle bottom 10 5 0 10 5 0 a mold draft angle top 0.50 0.43 0.35 .020 .017 .014 b lead width 0.20 0.15 0.09 .008 .006 .004 c lead thickness 10 5 0 10 5 0 f foot angle 0.55 0.45 0.35 .022 .018 .014 l foot length 3.10 2.95 2.80 .122 .116 .110 d overall length 1.75 1.63 1.50 .069 .064 .059 e1 molded package width 3.00 2.80 2.60 .118 .110 .102 e overall width 0.15 0.08 0.00 .006 .003 .000 a1 standoff 1.30 1.10 0.90 .051 .043 .035 a2 molded package thickness 1.45 1.18 0.90 .057 .046 .035 a overall height 1.90 .075 p1 outside lead pitch (basic) 0.95 .038 p pitch 5 5 n number of pins max nom min max nom min dimension limits millimeters inches * units dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed .005" (0.127mm) per s ide. notes: eiaj equivalent: sc-74a drawing no. c04-091 * controlling parameter revised 09-12-05
MCP73831/2 ds21984b-page 18 ? 2006 microchip technology inc. notes:
? 2006 microchip technology inc. ds21984b-page 19 MCP73831/2 appendix a: revision history revision b (march 2006) ? added mcp73832 through document. revision a (november 2005) ? original release of this document.
MCP73831/2 ds21984b-page 20 ? 2006 microchip technology inc. notes:
? 2006 microchip technology inc. ds21984b-page 21 MCP73831/2 product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . device: MCP73831: single-cell charge controller MCP73831t: single-cell charge controller (tape and reel) mcp73832 single-cell charge controller mcp73832t: single-cell charge controller (tape and reel) regulation voltage: code v reg 2= 3= 4= 5= 4.20v 4.35v 4.40v 4.50v options: * code i preg /i reg v pth /v reg i term /i reg v rth /v reg ac ad at dc 10 10 10 100 66.5 66.5 71.5 x 7.5 7.5 20 7.5 96.5 94 94 96.5 * consult factory for alternative device options temperature range: i= -40 c to +85 c (industrial) package: mc = dual-flat, no-lead (2x3 mm body), 8-lead ot = small outline transistor (sot23), 5-lead examples: * a) MCP73831-2aci/ot: 4.20v v reg , options ac, 5ld sot23 pkg b) MCP73831t-2aci/ot: tape and reel, 4.20v v reg , options ac, 5ld sot23 pkg c) mcp73832-2aci/mc: 4.20v v reg , options ac, 8ld dfn package d) mcp73832t-2aci/mc: tape and reel, 4.20v v reg , options ac, 8ld dfn package a) MCP73831-2ati/ot: 4.20v v reg , options at, 5ld sot23 pkg b) MCP73831t-2ati/ot: tape and reel, 4.20v v reg , options at, 5ld sot23 pkg c) mcp73832-2ati/mc: 4.20v v reg , options at, 8ld dfn package d) mcp73832t-2ati/mc: tape and reel, 4.20v v reg , options at, 8ld dfn package a) MCP73831-2dci/ot: 4.20v v reg , options dc, 5ld sot23 pkg b) MCP73831t-2dci/ot: tape and reel, 4.20v v reg , options dc, 5ld sot23 pkg c) mcp73832-2dci/mc: 4.20v v reg , options dc, 8ld dfn package d) mcp73832t-2dci/mc: tape and reel, 4.20v v reg , options dc, 8ld dfn package a) MCP73831-3aci/ot: 4.35v v reg , options ac, 5ld sot23 pkg b) MCP73831t-3aci/ot: tape and reel, 4.35v v reg , options ac, 5ld sot23 pkg c) mcp73832-3aci/mc: 4.35v v reg , options ac, 8ld dfn package d) mcp73832t-3aci/mc: tape and reel, 4.35v v reg , options ac, 8ld dfn package a) MCP73831-4adi/ot: 4.40v v reg , options ad, 5ld sot23 pkg b) MCP73831t-4adi/ot: tape and reel, 4.40v v reg , options ad, 5ld sot23 pkg c) mcp73832-4adi/mc: 4.40v v reg , options ad, 8ld dfn package d) mcp73832t-4adi/mc: tape and reel, 4.40v v reg , options ad, 8ld dfn package a) MCP73831-5aci/ot: 4.50v v reg , options ac, 5ld sot23 pkg b) MCP73831t-5aci/ot: tape and reel, 4.50v v reg , options ac, 5ld sot23 pkg c) mcp73832-5aci/mc: 4.50v v reg , options ac, 8ld dfn package d) mcp73832t-5aci/mc: tape and reel, 4.50v v reg , options ac, 8ld dfn package * consult factory for alternate device options part no. device x v reg /xx package xx options x temperature range ?
MCP73831/2 ds21984b-page 22 ? 2006 microchip technology inc. notes:
? 2006 microchip technology inc. ds21984b-page 23 information contained in this publication regarding device applications and the like is prov ided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application m eets with your specifications. microchip makes no representations or war- ranties 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 buyer?s 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. trademarks the microchip name and logo, the microchip logo, accuron, dspic, k ee l oq , micro id , mplab, pic, picmicro, picstart, pro mate, powersmart, rfpic, and smartshunt are registered trademarks of micr ochip technology incorporated in the u.s.a. and other countries. amplab, filterlab, migratable memory, mxdev, mxlab, seeval, smartsensor and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, app lication maestro, dspicdem, dspicdem.net, dspicworks, ecan, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, linear active thermistor, mpasm, mplib, mplink, mpsim, pickit, picdem, picdem.net, piclab, pictail, powercal, powerinfo, powermate, powertool, real ice, rflab, rfpicdem, select mode, smart serial, smarttel, total endurance, uni/o, wiperlock and zena are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of mi crochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2006, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. 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 the intended 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 produc ts in a manner outside the operating specif ications contained in microchip?s 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 microchip?s 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-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona and mountain view, california in october 2003. the company?s quality system processes and procedures are for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
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