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this is information on a product in full production. november 2013 docid024974 rev 3 1/30 30 pm6613n 2 to 4-cell li-ion, li-fepo 4 battery charger with smbus interface, n-channel rbfet and batfet mosfet selectors datasheet - production data features ? synchronous buck converter with n-channel high-side, low-side power mosfet integrated drivers ? 350 khz or 700 khz switching frequency, selectable with smbus ? ac adapter input voltage range 9 v - 24 v ? 5 v bias input voltage supply ? battery charge voltage range 2.5 v -18 v ? 1.53% charge voltage accuracy ? 0.1% cell charge voltage resolution ? 3% charge current accuracy ? 3% input current accuracy ? overvoltage, overcurrent protections ? battery, inductor, power mosfet short-circuit protection ? internal loop compensation network ? integrated soft-start ? selector ? n-channel acfet/rbfet mosfet driver ? n-channel batfet mosfet driver ? system ? 1 ma quiescent supply current ? 17 a - 35 a sleep mode current (batfet charge pump off - on) ? thermal shutdown list applications ? mobile pc: ? umpc/mid and tablets ? netbook and notebook computers description the pm6613n is a high efficiency battery charger with smbus communication interface. it includes a synchronous switching dc-dc converter with n-channel high-side and low-side power mosfet drivers. the possibility to set the switching frequency with smbus by choosing one of the two preset values of 350 khz or 700 khz assures the best trade-off between power conversion efficiency and pcb cost and size. integrated loop compensation network and soft- start allow the reduction of the number of external components. the pm6613n integrates 2 charge pumps to drive n-channel acfet/rbfet and batfet mosfets. the smbus communication interface is used to set the battery charge current and voltage. the pm6613n charges 2 to 4 series li-ion or lifepo 4 cells, for mobile pc applications. it is available in a compact vfqfpn 3x3 mm package. vfqfpn 3x3 20l table 1. device summary order code package packing PM6613NTR vfqfpn 3x3 20l tape and reel www.st.com
contents pm6613n 2/30 docid024974 rev 3 contents 1 device pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3 recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 operating description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1 smbus communication interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 acfet/rbfet and batfet system power selectors . . . . . . . . . . . . . . . 17 4.3 adapter detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.4 internal charge pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.5 switching frequency selection and emi adjustments . . . . . . . . . . . . . . . . 18 4.6 charge settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.7 adapter constant power function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.8 input current limit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.9 thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.10 battery protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.11 adapter insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.12 adapter removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 the pm6613n registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.1 charge option register (chrg_opt) . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.2 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.3 charge current register (chrg_amp) . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.4 charge voltage register (chrg_volt) . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.5 input current register (input_amp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
docid024974 rev 3 3/30 pm6613n list of tables list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 3. voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4. thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 5. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 7. recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 8. smbus communication timing values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 9. low power smbus dc specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 10. smbus command summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 11. valid battery charge voltage ranges for li-ion battery cells . . . . . . . . . . . . . . . . . . . . . . . . 19 table 12. valid battery charge voltage ranges for lifepo4 battery cells. . . . . . . . . . . . . . . . . . . . . . 19 table 13. battery overvoltage detection ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 14. adapter insertion sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 15. adapter removal sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 16. chrg_opt 0x12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 17. status 0x13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 18. chrg_amp 0x14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 19. chrg_volt 0x15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 20. input_amp 0x3f . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 21. vfqfpn 3x3x1.0 20 l pitch 0.4 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 22. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
device pinout pm6613n 4/30 docid024974 rev 3 1 device pinout figure 1. the pm6613n pinout pm6613n ph 1 high 2 btst 3 low 4 gnd 5 dcin 6 srp 7 srn 8 batfet 9 acn 10 acp 11 acdrv 12 b2b 13 acdiv 14 ilim 15 acok 16 iout 17 alarm# 18 scl 19 sda 20 am16597v1
docid024974 rev 3 5/30 pm6613n pin description 2 pin description table 2. pin description pin name description 1ph high-side power nmos driver source. connection to the high-side nmos source pin and low-side nmos drain pin. 2high high-side power nmos driver output. connection to the high-side nmos gate pin. in critical application conditions, a series resistor can be used to increase the nmos turn-on/off time and to limit the phase ringing, r = 4.7 . 3btst high-side power nmos driver power supply. connection to 5 v power supply voltage through a schottky diode, and to the phase net through a filtering capacitor. 4low low-side power nmos driver output. connection to the low-side nmos gate pin. in critical application conditions, a series resistor can be used to increase the nmos turn-on/off time and to limit the phase ringing, r = 4.7 . 5 gnd device analog and power ground reference. 6dcin 5 v input power supply. it is used to bias the internal logic and to supply the internal power drivers. an rc filter is used to limit inrush current and voltage spikes, typical value r=1 , c=10 f. 7 srp battery charge current sense resistor positive pin. 8 srn battery charge current sense resistor negative pin. 9batfet nmos driver output. connection to the batfet nmos gate pin, through a series resistor used to limit the inrush current. 10 acn input current sense resistor negative input. system power connection. 11 acp input current sense resistor positive input. rbfet nnmos drain pin connection. 12 acdrv nmos driver output. connection to the acfet and rbfet nmos gate pin, through a series resistor used to limit the inrush current. 13 b2b output driven by ac adapter back-to-back mos switches. connection to the acfet and rbfet nmos source pins. 14 acdiv adapter detection pin. adapter resistor divider connection. 15 ilim battery charge current limit setting pin. 16 acok ac adapter detection status pin. open-drain pin. it pulls high, when a valid adapter voltage is detected: 2 v < acdiv < 2.625 v. it pulls low when acdiv > 2.625 v or acdiv < 2 v. 17 iout adapter/battery charge current output pin, selectable using smbus command. i out voltage is 20 times the differential voltage across sense resistor. 18 alarm# open-drain output pin. low when a fault condition is detected, to trigger the system microcontroller interrupt.
pin description pm6613n 6/30 docid024974 rev 3 19 scl smbus clock pin. connection to the smbus clock line. open-drain pin, a pull-up resistor r = 10 k is used. 20 sda smbus data pin. connection to the smbus data line. open-drain pin, a pull-up resistor r = 10 k is used. table 2. pin description (continued) pin name description
docid024974 rev 3 7/30 pm6613n pin description figure 2. typical application circuit cbt1 1uf low d1 bat54jfilm btst +5v +5v +5v b2bc +5v riout 10kr sys ciout 100nf +5v acn rsb 10mr iout cadp1 22uf racdvr 3.9kr acdrv +5v c5v 10uf rbatfet 3.9kr batfetg rilu 1mr rill nm d2 bat54jfilm wake rwake 110kr +5v ralarmu 10kr cadp0 2.2uf; 25v rflt1 3.9r srp acok racdivl 56kr + cout2 10uf ph rbt 0r wake cin05 2.2uf; 10v rflt2 3.9r alarm racdivu 430kr +5v rsclu 10kr racoku 1mr scl d3 stps2l30a lsg nmos rbfet stl56n3llh5 1 2 3 4 5 6 7 8 high rsdau 10kr nmos ls stl56n3llh5 1 2 3 4 5 6 7 8 sys nmos hs stl56n3llh5 1 2 3 4 5 6 7 8 srn gnd batfet acdiv ilimext b2b rbfetg acp nmos batfet stl56n3llh5 1 2 3 4 5 6 7 8 batt sys batt scl sda iout_flt alarm# sda acok ilim l1 4.7uh cdc 10uf rdc 1r rsa 10mr cout1 10uf cin1 22uf pm6613n thp 21 ph 1 high 2 btst 3 low 4 gnd 5 dcin 6 srp 7 srn 8 batfet 9 acn 10 acp 11 acdrv 12 b2b 13 acdiv 14 ilim 15 acok 16 iout 17 alarm# 18 scl 19 sda 20 cbt 220nf adp ph nmos acfet stl56n3llh5 1 2 3 4 5 6 7 8 adp am16596v1
electrical characteristics pm6613n 8/30 docid024974 rev 3 3 electrical characteristics 3.1 absolute maximum ratings stresses beyond those listed in "absolute maximum ratings" may cause permanent damage to the device. exposure to absolute maximum rated conditions for extended periods may affect device reliability. table 3. voltage characteristics pins values unit batfet, acdrv, btst, high to gnd -0.3 to 36 v srp, srn, b2b, acp, acn to gnd -0.3 to 30 low, dcin, acdiv, ilim to gnd -0.3 to 6 ph to gnd -2 to 30 btst to ph -0.3 to 6 acok, iout, alarm#, scl, sda to gnd -0.3 to 6 srp to srn, acp to acn -0.5 to 0.5 acdrv to b2b -0.3 to 7 batfet to srn -0.3 to 7 table 4. thermal characteristics symbol parameters values unit r th(ja) thermal resistance junction-to-ambient 45 c/w t j junction operating temperature range -40 to 125 c t a ambient operating temperature range -40 to 85 t stg storage temperature range -50 to 150
docid024974 rev 3 9/30 pm6613n electrical characteristics table 5. electrical characteristics symbol parameters test conditions min. typ. max. unit supply current i slp total current (dcin, srn, srp, acp, acn, ph) consumption in sleep mode acdiv < acdiv slp batfet on 40 60 ua acdiv < acdiv slp batfet off 18 35 i op total quiescent supply current charge disabled 1.25 2.1 ma supply voltage dcin uvlo dcin uvlo rising threshold 3.8 4 4.2 v dcin uvlo falling threshold 3.65 3.85 4.05 acok comparator acdiv th acdiv rising voltage threshold to assert acok 1.87 2 2.13 v acdiv hys acdiv voltage threshold hysteresis 52035mv acdiv slp acdiv voltage threshold to enable internal bias 0.55 0.65 0.75 v acdiv ov acdiv rising threshold voltage to determine an ov condition that let acok go low 2.55 2.625 2.70 v acdiv ov_h acdiv overvoltage hysteresis 35 65 95 mv t r_acok rising edge deglitch time ad bit cleared 230 250 270 ms switching frequency f sw buck converter switching frequency bse bit cleared 600 700 800 khz bse bit set 300 350 400 charging voltage v batt_err charge voltage accuracy -1.53 1.53 % charging current i chg_err charge current accuracy v srn = 12 v i chg = 0.128 a r sense = 10 m -50 50 % i chg = 8.192 a r sense = 10 m -3 +3 adapter current sense amplifier i adp_g current sense amplifier gain 18 20 22 i adp_g_err current sense amplifier gain error -10 10 %
electrical characteristics pm6613n 10/30 docid024974 rev 3 i adp_src i acp + i acn source current v sense = = acp- acn = 0 52545ma battery current sense amplifier i batt_g current sense amplifier gain 18 20 22 i batt_g_err current sense amplifier gain error -10 +10 % i batt_src i srp + i srn source current v sense = = srp- srn = 0 52550ma light load comparator i ll light load average current falling threshold for asynchronous working mode. low-side mosfet turned on only when i chg > i ll am[1:0]=0x0 0.25 0.45 0.65 a am[1:0]=0x1 0.70 0.90 1.10 am[1:0]=0x2 1.10 1.30 1.50 am[1:0]=0x3 1.50 1.70 1.90 i ll_hys i ll hysteresis 255 280 305 ma b2b i b2b b2b pull-down current acok = ?0? dcin = 5 v 1.9 2.3 2.7 ma v b2b_low b2b rising threshold to enable charge 4.4 5 5.6 v v b2b_low_h v b2b_low hysteresis 300 450 600 mv i lim comparator v ilim_fall i lim falling threshold for disabling charge 55 75 95 mv v ilim_rise i lim rising threshold for enabling charge 75 95 115 battery fault comparators v batt_low battery voltage rising threshold for enabling charge 2.45 2.55 2.65 v v batt_low_his t v batt_low comparator hysteresis 85 100 115 mv v batt_ov battery overvoltage rising threshold as difference between srn voltage and chrg_volt register value li- ion 120 170 220 mv/cell lifepo 4 100 140 170 table 5. electrical characteristics (continued) symbol parameters test conditions min. typ. max. unit
docid024974 rev 3 11/30 pm6613n electrical characteristics v batt_ov_h v batt_ov overvoltage hysteresis li- ion 75 90 105 mv/cell lifepo 4 55 75 85 v batt_ov_pd pull down current on srn pin during overvoltage condition 3.5 5 6.5 ma i batt_oc battery overcurrent threshold as difference with chrg_amp register value 1.7 2 2.3 a i batt_oc_h battery overcurrent hysteresis 300 400 510 ma adapter fault comparators i adp_oc adapter input overcurrent threshold as difference with input_amp register value 1.7 2 2.3 a i adp_oc_h i adp_oc overcurrent hysteresis 250 400 550 ma batfet driver v batfet_drv batfet gate driving voltage respect to srn pin batfet-srn 5.3 6 6.6 v i batfet_short batfet driver max. current batfet shorted to srn 35 60 80 ma acdrv driver v acdrv_drv rbfet gate driving voltage respect to b2b pin acdrv-b2b 5.3 6 6.6 v i acdrv_short batfet driver max. current batfet shorted to srn 35 55 75 ma table 5. electrical characteristics (continued) symbol parameters test conditions min. typ. max. unit
electrical characteristics pm6613n 12/30 docid024974 rev 3 3.2 operating characteristics table 6. typical operating characteristics symbol parameters test conditions min. typ. max. unit charging voltage v cell_res cell voltage resolution 4 mv/cell charging current i chg_res charge current control resolution r sense = 10 m 64 ma a2b adapter to battery comparator t r_a2b rising edge deglitch time 3 ms adapter current sense amplifier i adp_vos current sense amplifier offset referred to input 1 mv battery current sense amplifier i batt_vos current sense amplifier offset referred to input 1 mv hs short detection (1) 1. guaranteed by design v hs_short phase to gnd threshold for high-side short detection when low-side is on 200 mv t hs_short mask time on hs_short from low-side turn-on time 300 ns batfet driver r batfet_drv batfet driver output impedance i batfet < 20 a42 k r batfet_off charge pump off resistance 5 k acdrv driver r acdrv_drv rbfet driver output impedance i acdrv < 20 a 42 k r acdrv_off charge pump off resistance 5 k hs driver (1) hs ron high-side driver turn-on resistance v btst -v ph = 5 v 3.6 hs roff high-side driver turn-off resistance 0.7 ls driver (1) ls ron low-side driver turn-on resistance 3.2 ls roff low-side driver turn-off resistance 0.8
docid024974 rev 3 13/30 pm6613n electrical characteristics 3.3 recommended operating conditions (dcin = 5 v, t j = 25 c unless otherwise specified) table 7. recommended operating conditions symbol parameters test conditions min. typ. max. unit supply voltage dcin op dcin input voltage operating range 4.5 5.5 v v adp adapter maximum voltage 24 v charging voltage v cell cell charge voltage li-ion 4 4.508 v/cell lifepo4 3.4 3.908 v batt charge voltage range 6.8 18.032 v charging current i chg buck converter regulated charge current range r sense = 10 m 0.128 16.320 a a2b adapter to battery comparator a2b th a2b rising threshold 0.35 0.45 0.55 v i a2b a2b sink current from b2b pin 12 14 16 a adapter current sense amplifier i adp_cm iadp input common mode minimum voltage 2.5 v battery current sense amplifier i batt_cm ibatt input common mode minimum voltage 2.5 v thermal protection t shut temperature rising threshold for disabling charge 160 c t shut_h thermal shutdown temperature hysteresis 10 c
electrical characteristics pm6613n 14/30 docid024974 rev 3 table 8. smbus communication timing values symbol parameters min. max. unit f smb smbus operating frequency 10 100 khz t (buf) bus free time between stop and start condition 4.7 s t h(sta) hold time after (repeated) start condition. after this period, the first clock is generated 4 t su(sta) repeated start condition setup time 4.7 t su(stop) stop condition setup time 4 t h(dat) data hold time 300 ns t su(dat) data setup time 250 t timeout detect clock high timeout 50 s t w(l) clock low period 4.7 s t w(h) clock high period 4 50 t r clock/data fall time 300 ns t f clock/data rise time 1000 t por time in which a device must be operational after power-on reset 500 ms table 9. low power smbus dc specifications symbol parameters min. max. unit v il data, clock input low voltage 0.8 v v ih data, clock input high voltage 2.1 vdd v ol data, clock output low voltage 0.4 i leak input leakage 5 a i pullup current through pull-up resistor or current source 100 350 vdd nominal smbus voltage 2.7 5.5 v
docid024974 rev 3 15/30 pm6613n operating description 4 operating description 4.1 smbus communication interface the pm6613n communicates to the system mcu by the smbus interface. the pm6613n is compliant with the system management bus specification v2.0 (please refer to the official website www.smbus.org). the pm6613n uses a simplified command subset, with smbus read-word and write-word protocols to communicate to the system mcu.the pm6613n works in slave mode only; according to the smbus specifications, the slave address is set by using 7 bits, the value is 0b0010010 (0x12). the smbus interface input pins sda (data) and scl (clock) have schmitt-trigger inputs. selecting pull-up resistors by 10 k for both of them to achieve rise times according to the smbus specifications. a watchdog timer adjust function is provided within register 0x12. the charge is suspended if ic does not receive write charge voltage or write charge current command within the watchdog time period and watchdog timer is enabled. the charge is resumed after receiving write charge voltage or write charge current command when watchdog timer expires and charge suspends. figure 3. smbus communication timing waveforms t su(sta) t w(h) t w(l) t f t r t (buf) t h(sta) t h(dat) t su(dat) t h(dat) t su(stop) t r sda scl am16598v1
operating description pm6613n 16/30 docid024974 rev 3 figure 4. smbus write-word and read-word protocols s slave address 7 bits 0010010 w 1b 0 ack 1b 0 command byte (charger register ) 8 bits msb lsb ack 1b 0 low data byte 8 bits msb lsb ack 1b 0 high data byte 8 bits msb lsb ack 1b 0 p write-word format read -word format s slave address 7 bits 0010010 w 1b 0 ack 1b 0 command byte (charger register ) 8 bits msb lsb ack 1b 0 s slave address 7 bits 0010010 r 1b 1 ack 1b 0 low data byte 8 bits msb lsb ack 1b 0 high data byte 8 bits msb lsb n ack 1b 1 p s start condition or repeated start condition ack acknowledge (logic -low) w write bit ( logic -low) p r stop condition n ack read bit (logic -high) not - acknowledge (logic -high) xxxx master to slave xxxx slave to master am16599v1
docid024974 rev 3 17/30 pm6613n operating description the pm6613n supports 7 smbus commands as listed in tab le 10 . 4.2 acfet/rbfet and batfet system power selectors the pm6613n integrates 2 charge pumps to drive nmos selectors for acfet/rbfet and batfet. at reset condition, the pm6613n internal circuitry controls the rbfet turn-on, to avoid inrush current flowing from adp (adapter) to sys (system). the batfet selector connects (disconnects) the battery from the system. at reset condition, the batfet selector is controlled by the internal circuitry. during a charging process, if the adapter is disconnected, the pm6613n stops any charge operation and remains in sleep mode: if the bse is set, the pm6613n connects the battery to the system. if the sovr bit is set, the internal circuitry can be disabled: the nmos selectors can be manually controlled changing the ared and bed bits respectively. table 10. smbus command summary address register 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0x12 chrg_opt ad wd[1:0] bse pf efa ee am[1:0] is sovr bed ared cf r ci reset value01110001000000 1 0x13 status reserved ts hbro rbss aoc ioc bov boc lb aov auv hs reset value 00000000000 0x14 chrg_amp res amp[13:6] reserved reset value 00000000 0x15 chrg_volt r volt[14:1] r reset value 00000000000000 0x3f input_amp res amp[13:7] reserved reset value 1000000 0xfe man_id manufacturer id reset value000000000010000 0xff dev_id device id reset value000000000000000
operating description pm6613n 18/30 docid024974 rev 3 4.3 adapter detection the acok pin is an open-drain output signal to inform the system mcu that a valid adapter voltage has been detected by the acdiv pin (acdiv > 2 v). at reset condition, for safety reason, a delay is applied to the internal circuitry, in order to avoid false adapter insertions. an adapter insertion is detected when the voltage across acdiv pin is higher than 2.0 v. a voltage divider assures that when the adapter is inserted a voltage between 2.0 v and 2.65 v is applied to acdiv pin. the internal circuitry checks for 250 ms that this voltage is stable, and in this case enables the acfet/rbfet selectors and the acok pin. the delay can be removed clearing the ad bit on the chrg_opt register. 4.4 internal charge pumps some charge pumps allow the pm6613n to supply the internal drivers necessary to drive the acfet/rbfet selectors, the batfet selector and the high-side mosfet. the acfet/rbfet selectors are switched off/on by the acdrv pin. an internal charge pump is used to lift the acdrv voltage using the voltage coming from the b2b pin.the high-side mosfet is controlled by the high pin. a charge pump receives the base voltage from the ph pin, allowing the high pin to be toggled. the batfet selector is driven by the batfet pin whose voltage is bootstrapped using the btst pin. 4.5 switching frequency selection and emi adjustments the pm6613n buck converter switching frequency can be chosen, by setting bit 9 and bit 10 of the chrg_opt register. the choice depends on the compromise among efficiency, inductance, output capacitor, and the pcb area. an additional offset can be applied to the nominal frequency to avoid emi issues, settin g the bit ee of the chrg_opt register. the offset can be set to 15% changing the bit efa of the chrg_opt register. 4.6 charge settings the pm6613n uses 3 smbus registers and the ilim pin to control the charging process. the chrg_volt register sets the voltage limit, ranging from a minimum value of 6800 mv to a maximum value of 18032 mv, with 2 mv step resolution. not all the values are allowed within the above range (see table 11 and table 12 ). any attempt to write a non valid value causes the internal circuitry to clear the register and stop any charging process. the chrg_amp register sets the current limit drained to the battery. the allowable value ranges from a minimum of 128 ma to a maximum of 16320 ma. setting a value outside this range causes the pm6613n to clear the register and terminate any charging process. the charging current is sensed measuring the differential voltage between srp and srn pins where a small resistor value is connected to. a suggested value is 10 m , and not more than 20 m . greater values increase the sensitivity of the current sensing and the regulation accuracy, but cause a higher power loss and could lead to an overcurrent protection latching. the charge current limit can be set forcing a voltage through the ilim pin too. the pm6613n automatically sets the maximum charge current by choosing the minimum value between the i lim voltage value and the chrg_amp register. the relationship between the i lim voltage and the input current limit is reported below:
docid024974 rev 3 19/30 pm6613n operating description equation 1 whereas r sb is the sensing resistor connected between the srp and srn pins and i chg is the charge current limit. the charge is disabled when the i lim voltage decreases below 70 mv and re-enabled when increases over 90 mv. the i lim control can be disabled by pulling it to 5 v. 4.7 adapter constant power function the adapter constant power function manages the amount of input current flowing to the system and to the battery during a charging process. if the input current exceeds the chosen input current limit, the pm6613n keeps the input current at the limit decreasing the charging current. in this manner the system load has the priority. as the system load current increases, the charging current linearly decreases down to 0 a. the input current is sensed measuring the differential voltage between acp and acn pins where a small resistor is connected. a suggested value is 10 m , and eventually not more than 20 m . greater values increase the sensitivity and a finer current limit management, but cause a higher power loss and could lead to an overcurrent protection due to a higher voltage ripple. the input_amp register sets the input current limit through smbus. valid ranges are between 128 ma and 16256 ma. any attempt to write a value outside this range causes the register to be cleared and any charging process to be stopped. table 11. valid battery charge voltage ranges for li-ion battery cells cells chrg_volt charge voltage [mv] min. max. min. max. 2 0x1f40 0x2338 8000 9016 3 0x2ee0 0x34d4 12000 13524 4 0x3e80 0x4670 16000 18032 table 12. valid battery charge voltage ranges for lifepo 4 battery cells cells chrg_volt charge voltage [mv] min. max. min. max. 2 0x1a90 0x1e88 6800 7816 3 0x27d8 0x2dcc 10200 11724 4 0x3520 0x3d10 13600 15632 v ilim r sb i chg 10 0.03125 + ?? =
operating description pm6613n 20/30 docid024974 rev 3 4.8 input current limit protection an input current limit protection is integrated into the pm6613n. when the input current, sensed by acp and acn pins, reaches 2 a more than the value stored on input_amp, the internal circuit stops any charging process and sets the aoc bit of the status register. when the fault condition is not more present for 2.5 ms, the charging process is recovered by a soft-start. 4.9 thermal shutdown a thermal protection feature is integrated in the pm6613n. if the junction temperature (t j ) exceeds 165 c, the internal circuitry stops any charging process and the bit ts of status register is set. when t j falls below 145 c, the charger exits from the fault condition and after 2.5 ms the charging process resumes by a soft-start. 4.10 battery protection several protection features disable the charging process if the battery condition falls in one of the following conditions: ? battery undervoltage ? battery overvoltage ? battery overcurrent a voltage fault is detected sensing the battery voltage on srn pin. a battery undervoltage condition occurs when the srn voltage is below 2.5 v: the lb bit of the status register is set. a battery overvoltage occurs when srn voltage exceeds the charging voltage according to the ta ble 13 : battery current is sensed by the current flowing through a small resistor connected between srp and srn pins. an overcurrent condition occurs when the battery average current exceeds the value set in the chrg_amp regist er by 2 a: the boc bit of the status register is set. 4.11 adapter insertion when the acdiv pin has a voltage under the acdiv slp (see table 14 ), the pm6613n is in sleep mode. if bse of chrg_opt register is set, the batfet selector is kept closed, allowing the battery to supply the system. when the adapter is inserted, the acdiv pin voltage rises, and when it reaches a 0.65 v threshold, the pm6613n goes out of the sleep mode. when the acdiv pin reaches 2 v threshold, an internal comparator monitors this condition for a programmable deglitch time, set to 250 ms at power-on reset. if the condition is stable after this time, the acok pin goes high. this time can be reduced setting the ad bit table 13. battery overvoltage detection ranges battery type overvoltage threshold li-ion chrg_volt[mv]+170 mv* cells li-fepo 4 chrg_volt[mv]+144 mv* cells
docid024974 rev 3 21/30 pm6613n operating description of chrg_opt register. when acok is high, the acfet selector has to be switched on, in order to supply the b2b pin. this pin is used to provide the offset for the charge pump that supplies the acfet/rbfet selectors. once b2b reaches the 2.5 v threshold, the batfet selector is switched off and the battery is disconnected from the system: in this case the current flows to the system through the body diode of the selector. when the b2b pin crosses the battery voltage (sensed by srn pin) by 255 mv, the rbfet is switched on. from now on the system is supplied by the adapter. the described sequence is summarized in the below table: 4.12 adapter removal when the adapter is unplugged, a disconnection sequence occurs, bringing the charger into a sleep mode. when the acdiv pin goes below 1.95 v, the acok pin goes immediately low: there's no deglitch time in this case. any charging process is interrupted and the b2b pin is internally discharged. the b2b pin is used to sense the system voltage through the acfet/rbfet selectors. when the b2b pin goes below the value of the battery plus 225 mv, the acfet/rbfet selectors are opened if sovr bit of chrg_opt is set, and the batfet selector is closed if the bse bit of chrg_opt is set, allowing the battery to supply the system. as the system voltage is much closer to the battery voltage, any inrush current caused by system capacitors is avoided. when the acdiv voltage goes below 0.6 v the pm6613n is in sleep mode. the sequence is summarized in tab le 15 table 14. adapter insertion sequence condition action adapter insertion acdiv voltage rises acdiv > 0.65 v pm6613n goes out of sleep mode b2b pin forces a low voltage acdiv > 2 v acok pin goes high after 250 ms b2b pin stops forcing voltage acfet is turned on b2b voltage rises b2b > 2.5 v batfet is off b2b > srn+225 mv acfet/rbfet is on table 15. adapter removal sequence condition action adapter unplugged acdiv voltage decreases acdiv < 1.95 v acok goes low b2b pin forces a low voltage internal circuitry disables any charging process b2b < srn+ 225 mv acfet/rbfet selectors opened batfet selector closed acdiv < 0.6 v the pm6613n is in sleep mode
the pm6613n registers pm6613n 22/30 docid024974 rev 3 5 the pm6613n registers 5.1 charge option register (chrg_opt) address: 0x12 reset value: 0x7101 ? bit 15 ad: acok deglitch ? set by software to enable a delay for the adapter insertion ? 0: the pm6613n waits for 250 ms for adapter voltage detection ? 1: the pm6613n waits for a time < 50 s for adapter voltage detection ? bit [14:13] wd: watchdog ? set by software to enable and select the timeout of the pm6613n watchdog ? 00: watchdog disabled ? 01: enabled, timeout at 44 sec. ? 10: enabled, timeout at 88 sec. ? 11: enabled, timeout at 175 sec. ? bit 12 bse: batfet sleep enabled ? set by software to control the batfet selector behavior, when the pm6613n is in sleep mode ? 0: batfet disabled during sleep mode ? 1: batfet enabled during sleep mode ? bit 11 pf: pwm frequency ? set by software to select the working pwm frequency of the buck converter ? 0: pwm frequency set to 700 khz ? 1: pwm frequency set to 350 khz ? bit 10 efa: emi frequency adjustments ? set by software in order to increase or decrease by 15% the pwm frequency of the buck converter when ee bit is enabled ? 0: pwm frequency decreased by 15% ? 1: pwm frequency increased by 15% table 16. chrg_opt 0x12 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ad wd[1:0] bse pf efa ee am[1:0] is sovr bed ared cf res ci rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
docid024974 rev 3 23/30 pm6613n the pm6613n registers ? bit 9 ee: emi enabled ? set by software to enable the emi reduction function ? 0: emi disabled ? 1: emi enabled ? bit 8:7 am: asynchronous mode ? set by software to choose the average charging current limit for passive recirculation condition ? 00: 375 ma ? 01: 750 ma ? 10: 1125 ma ? 11: 1500 ma ? bit 6 is: iout selection ? set by software to choose which current has to be monitored through the iout pin ? 0: adapter current ? 1: battery current ? bit 5 sovr: selector override ? set by software to enable the external control of the rbfet/batfet selectors. once set, rbfet/batfet can be controlled by bits 3 and 4 ? 0: override enabled ? 1: override disabled ? bit 4 bed: batfet external driver ? set by software to control the external selector batfet. ovr bit has to be set, in order to control batfet ? 0: open batfet ? 1: close batfet ? bit 3 ared: acfet/rbfet external driver ? set by software to control the external selectors acfet/rbfet. ovr bit has to be set, in order to control acfet/rbfet ? 0: open acfet/rbfet selectors ? 1: close acfet/rbfet selectors ? bit 2 cf: clear fault ? set by software to clear the status register. the bit is cleared once the process has been executed ? 0: status register unchanged ? 1: clear status register ? bit 1 reserved, read as 0 ? bit 0 ci: charge inhibited ? set by software to inhibit the charging process ? 0: charge enabled ? 1: charge inhibited
the pm6613n registers pm6613n 24/30 docid024974 rev 3 5.2 status register address: 0x13 reset value: 0x0000 ? bit 15:11 reserved, read as 0 ? bit 10 ts: thermal shutdown ? set by hardware to indicate that thermal shutdown condition occurred on the pm6613n. thermal shutdown occurs when the junction temperature (t j ) is higher than 165 c. it's cleared by hardware when t j drops below 145 c. ? bit 9 hbro: hs btst rbfet open ? bit 8 rbss: rbfet selector short ? set by hardware to indicate a short on rbfet between drain and source ? 0: no short detected ? 1: short detected ? bit 7 aoc: adapter overcurrent ? set by hardware to indicate that the adapter current is 2 a higher than the value ? bit 6 oc: i lim overcurrent ? set by hardware when input current crosses the input limit set by input_amp register and ilim pin ? 0: no input overcurrent detected ? 1: input overcurrent detected ? bit 5 bov: battery overvoltage ? set by hardware when the pm6613n detects a battery voltage (srn pin) higher than the value reported on ta ble 13 ? 0: no battery overvoltage detected ? 1: battery overvoltage detected ? bit 4 boc: battery overcurrent ? set by hardware when the pm6613n detects a current flowing through the battery, 2 a higher than the value set on chrg_amp register ? 0: no battery overcurrent detected ? 1: battery overcurrent detected ? bit 3 lb: low battery ? set by hardware when the pm6613n detects a battery voltage (srn pin) lower than 2.5 v ? 0: no low battery condition detected ? 1: low battery condition detected table 17. status 0x13 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 reserved ts hbro rbss aoc ioc bov boc lb aov auv hs rr rrrrrrrrr
docid024974 rev 3 25/30 pm6613n the pm6613n registers ? bit 2 aov: acdiv overvoltage ? set by hardware when the pm6613n detects an acdiv pin voltage higher than 2.625 v ? 0: no acdiv overvoltage detected ? 1: acdiv overvoltage detected ? bit 1 auv: acdiv undervoltage ? set by hardware when the pm6613n detects an acdiv pin voltage lower than 2 v ? 0: no acdiv undervoltage detected ? 1: acdiv undervoltage detected ? bit 0 hs: high-side short ? set by hardware when a short condition is detected between drain and source of the high-side mos ? 0: no short detected on high-side mos ? 1: short detected on high-side mos 5.3 charge current register (chrg_amp) address: 0x14 reset value: 0x0000 ? bits 13:6 amp[13:6]: charge current configuration bits ? these bits are written by software and fix the amount of current to be delivered when battery is charging. values are in ma. the range goes from 64 ma when amp[13:6] = 0x0040 to 16320 ma when amp[13:6] = 0x3fc0. minimum step is 64 ma. table 18. chrg_amp 0x14 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 reserved amp[13:6] reserved rw rw rw rw rw rw rw rw
the pm6613n registers pm6613n 26/30 docid024974 rev 3 5.4 charge voltage register (chrg_volt) address: 0x15 reset value: 0x0000 ? bits 14:1 volt[14:1]: charge voltage configuration bits ? these bits are written by software and fix the voltage to apply to the battery when it is charging. values are in mv and set according to the following formula: equation 2 not all the values are allowed. see tab le 11 and ta ble 12 for allowable ranges. 5.5 input current register (input_amp) address: 0x3f reset value: 0x2000 ? bits 13:7 amp[13:7]: charge current configuration bits ? these bits are written by software and fix the current limit delivered by the adapter. the range goes from 128 ma when amp[13:6] = 0x0080 to 16256 ma when amp[13:6] = 0x3f80. minimum step is 128 ma. table 19. chrg_volt 0x15 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 res volt[14:1] res rw rw rw rw rw rw rw rw rw rw rw rw rw rw v bat 22 volt 14 1 [] ? () mv = table 20. input_amp 0x3f 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 reserved amp[13:7] reserved rw rw rw rw rw rw rw
docid024974 rev 3 27/30 pm6613n package mechanical data 6 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. table 21. vfqfpn 3x3x1.0 20 l pitch 0.4 package dimensions ref. min. typ. max. a 0.8 0.90 1.00 a1 0.02 0.05 a2 0.65 1.00 a3 0.20 b 0.15 0.20 0.25 d 2.85 3.00 3.15 d1 1.60 d2 1.50 1.60 1.70 e 2.85 3.00 3.15 e1 1.60 e2 1.50 1.60 1.70 e 0.35 0.40 0.45 l 0.30 0.40 0.50 ddd 0.07
package mechanical data pm6613n 28/30 docid024974 rev 3 figure 5. vfqfpn 3x3x1.0 20 l pitch 0.4 mechanical data drawings b5(9b$
docid024974 rev 3 29/30 pm6613n revision history 7 revision history table 22. document revision history date revision changes 23-jul-2013 1 initial release. 25-sep-2013 2 updated, in table 5: electrical characteristics , the following parameters: i op , acdiv th , v batt_err , i chg_err , i adp_g_err , i batt_g_err and i batt_src . datasheet status promoted from preliminary to production data. 27-nov-2013 3 changed the value of charge voltage accuracy from 0.5% to 1.53% in the features. updated light load comparator, battery fault comparators, t r_acok and f sw test conditions in table 5: electrical characteristics . updated i batt_oc and i adp_oc parameters in table 5: electrical characteristics . updated table 7: recommended operating conditions . changed the title of table 16 , table 17 , table 18 , table 19 and table 20 .
pm6613n 30/30 docid024974 rev 3 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statem ents and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2013 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - swed en - switzerland - united kingdom - united states of america www.st.com

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