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1/18 february 2003 n dedicated i.c. for 1 li-ion cell or 3 ni-mh cells n 5 different operating modes n 150 ma precharge current n very low drop charge switch (130mv @ 800ma) n very low drop reverse switch (130mv @ 800ma) n 5.7v over battery over voltage protection n charger detection mode n (v charge -v batt )detectionmode description this specification describes a dedicated i.c. which allows to charge 1 lilon cell or 3 nimh cells. the principle used to charge the batteries is the pulsed current, the monitoring is operated by the micro-contoller of the application. this ic integrates one power switch and achieves the charge batteries in two different modes charge or precharge. one of this operating mode (charge or precharge) can be selected in a static or pulsed way by one i/ o from a micro-controller. the ic can supply power to accessories controlled by this i.c. in reverse mode. the i.c. is available in the smaller and surface mounted so-8 (exposed pad version) package. st3s01led battery charge i.c. schematic diagram so-8 exposed pad
st3s01led 2/18 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. (*) the i.c. is automatically turned off when v charge reaches typically 14v (v charge rising edge); typical hysteresis is 700mv (v charge falling edge) thermal data ordering codes connection diagram (top view) symbol parameter value unit v batt battery voltage -0.3 to 6 v v charge charge voltage (*) -12 to 16 v v flag (v charge -v batt ) flag control voltage -0.3 to 12 v v charger-ok charger flag control voltage -0.3 to 12 v v cmd-pwm pwm command voltage -0.3 to 5 v v cmd-mode cmd command voltage -0.3 to 5 v v cmd-reverse reverse command voltage -0.3 to 5 v i switch internal switch continuous max current t amb = 85c, r thj-amb = 40c/w 2a t amb = 30c, r thj-amb = 40c/w 3a internal switch peak current t<1ms duty cycle < 1% r thj-amb = 40c/w 8a t stg storage temperature range -55 to +125 c t j operating junction temperature range -40 to +125 c t amb operating ambient temperature range (if an adeguate heatsink is provided) -40 to +85 c symbol parameter so-8 unit r thj-case thermal resistance junction-case 10 c/w type so-8 exposed pad so-8 exposed pad (t&r) st3s01led st3s01led ST3S01LED-TR
st3s01led 3/18 pin description operating mode pin n symbol name and function 1v batt battery pin: input pin when reverse mode is selected; output pin when in charge or precharge mode 2 cmd-reverse reverse command pin: enables the reverse mode when connected to a positive voltage higher than 1.2v. logic pin internally pulled down. 3 cmd-pwm pwm command pin: allows to control the precharge or charge switch in pwm mode (refer to the table 1 for the different operating modes). logic pin internally pulled down. 4 cmd-mode mode command pin: allows to switch between precharge and charge mode (refer to operating modes table). logic pin internally pulled down. 5 gnd gnd pin 6 charger-ok charger-ok output pin; open drain n-channel mosfet that is in high impedance when the v charge voltage drops below 2.5v and cmd-reverse is low. when the reverse function is activated, this open drain have the same information of the (v charge -v batt ) flag. 7 flag flag pin (v charge -v batt ): open drain n-channel mosfet that sinks current when the v charge voltage is higher than the v batt . 8v charge charger supply pin: input pin when charge or precharge mode is selected; output pin when in reverse mode. cmd-pwm cmd-mode operating function selected 0 0 precharge mode (default state) 0 1 charge mode 1 0 charge and precharge switches are open 1 1 charge and precharge switches are open
st3s01led 4/18 i.c. block diagram possible operating modes five different operating modes are allowed: charge, precharge, reverse, charge+reverse and precharge+reverse. these operating modes can be achieved by properly selection of the cmd-reverse cmd-pwm and cmd-mode (see possible operating mode table). precharge mode the precharge function is composed by a switch and a 100ma current source which fully works for v charge higher than 2.5v. when the cmd-mode and the cmd-pwm are not leaded the switch is on, being the input states held by an internal pull down resistor. this is used when the battery is strongly discharged. in this case v batt can be null (battery empty) and all the input pins are not held by any level (because the micro-controller is down), except the v charge pin which is a main supply. the source of current supplies a constant current into the battery till its voltage level reaches the required level allowing to start the micro-controller (typically 3v). the current direction is from v charge to v batt .the reverse leakage current when the swich is on must be null; this is obtained thanks to an internal circuitry that switch off the internal p-mos when the v batt is higher than v charge ,whateverthe status of the cmd-mode. the precharge function is also used to adjust the mean current. when the
st3s01led 5/18 battery is fully charged the current into the battery has not to be more than c/25 (nimh battery). in order to perform finely this, the cmd-pwm pin must be driven with pwm function (in the same time, the cmd-mode must be kept low). the duty cycle allows to adjust the mean current needed. charge mode thecmd-modepin,whenhigh(andcmd-pwm low), handles the switch in charge mode. this switch allows the battery charge with a strong current. the drop of this internal p-channel mos is very low (200mv @ 800ma) in order to optimize the efficiency of the charge. the switch is not internally protected against short circuit or overcurrent condition. when the switch is on (cmd-mode high and cmd-pwm low), the current direction into the chip is from v charge to v batt . the reverse current when the switch is on must be null; this is obtained by mean of an internal circuitry that switch off the internal p-mos when the v batt is higher than v charge , whatever the status of the cmd-mode. when the cmd-mode pin is low or in high impedance the switch is off, while it is on when the signal on that pin is high. reverse mode when the reverse function is selected by cdm-reverse pin, the switch allows to supply the accessories with a strong current. the drop of the internal p-channel mos is very low (200mv @ 800ma) and the switch properly work for v batt higher than 2.5v. this allows to supply energy on the v charge pin. when the switch is on (cmd-reverse high) the current direction into thechipisfromv batt to v charge . the reverse current (from v charge to v batt ) when the switch is on must be null; this is obtained by mean of an internal circuitry that switch off the internal p-mos when the v charge is higher than v batt , whatever the status of the cmd-reverse. when the level of cmd-reverse pin is low or in high imp edance, the switch is off, while it is on when the signal on cmd-reverse pin is high. overvoltage protection this function allows to held the switches off when the voltage level on v batt is higher than a maximum voltage whatever are the values of cmd-pwm, cmd-mode and cmd-reverse. this maximum voltage is shown in the electrical characteristic (typical threshold 5.7v). from the moment in which the o.v.protection is activated, it will be possible to turm on again the switch only when the v charge value decreases down to 2.5v typically, it doesn't matter which operation mode is selected. the protection works only when the battery is in charge or precharge mode, i.e. v charge >v batt . this represents, in fact, the typical application condition where the battery could increase its value, i.e. when charge or precharge mode are used. charger detection mode this function allows to generate a digital signal (charger-ok) to indicate if the v charge voltage is higher than 2.5v and the reverse function is inactive. this functionality allows to determine if the charger is present or not; if the v charge is lower than the 2.5v, the charger-ok goes into high impedance (open drain). when the reverse function is active, this open drain have the v charge -v batt information. this circuitry is directly supplied from v charge pin and works only for v charge higher than 2.2v. v charge -v batt detection mode this function allows to generate a digital signal (v charge -v batt )flagtoindicateifthev charge voltage is higher than v batt ;ifthev charge is lower than the v batt , this open drain goes into high impedance state. this circuitry is directly supplied from v charge pin and works only for v charge higher than 2.2v. thermal protection an internal thermal shutdown circuitry will switch off the p_mos, only in precharge or in charge mode, when the junction temperature reaches typically 180c. this has been implemented in order to protect the device from overburning. 20c of thermal hysteresis will avoid a thermal oscillation. this circuitry is supplied from v charge and, so, acts only on the precharge and charge switches. esd protection both v charge and v batt pins are protected against electrostatic discharge up to 4kv (hbm, mil std 833d. charge voltage v charge functional operating range is from 2.5v to12v.atv charge =14v typically the i.c. is automatically turned off and remains off up to 16v. a v charge voltage higher than 16v can damage the ic.
st3s01led 6/18 possible operating mode electrical characteristics of reverse switch (t a = -40 to 85c, unless otherwise specified.) cmd-pwm cmd-mode cmd-reverse operating function selected 0 0 0 precharge 0 0 1 precharge + reverse 0 1 0 charge 0 1 1 charge + reverse 1 0 0 switch open 1 0 1 reverse 1 1 0 switch open 1 1 1 reverse symbol parameter test conditions min. typ. max. unit v batt reverse block operating input voltage 2.5 6 v v drop dropout voltage v batt =3v i reverse =800ma v cmd-reverse =1.9v, v cmd-pwm =1.9v v cmd-mode =1.9v 130 200 mv i leakage reverse leakage current (from v charge to v batt , tested on v batt pin) v batt =0v v charge =9v v cmd-reverse =1.9v, v cmd-pwm =1.9v v cmd-mode =1.9v 01 m a v ih cmd-reverse logic high (switch on) v batt =3v i reverse =10ma v cmd-pwm =1.9v v cmd-mode =1.9v 1.2 v v il cmd-reverse logic low (switch off) v batt =3v i reverse =10ma v cmd-pwm =1.9v v cmd-mode =1.9v 0.4 v v th cmd-reverse logic typical threshold v batt =3v i reverse =10ma v cmd-pwm =1.9v v cmd-mode =1.9v 0.75 v i cmd-rev cmd-rev input current v batt =3v i reverse =10ma v cmd-reverse =1.9v, v cmd-pwm =1.9v v cmd-mode =1.9v 1 1.9 3 m a v batt =5v i reverse =10ma v cmd-reverse =1.9v, v cmd-pwm =1.9v v cmd-mode =1.9v 10 m a t on-off response time 100 m s
st3s01led 7/18 electrical characteristics of precharge switch (t a = -40 to 85c, unless otherwise specified.) symbol parameter test conditions min. typ. max. unit v charge precharge block operating input voltage 2.5 12 v v drop dropout voltage v charge = 2.5v to 9v i precharge =100ma v cmd-reverse =0v or floating v cmd-pwm =0v or floating v cmd-mode =0v or floating 0.13 1.2 v i precharge precharge current limit (from v charge to v batt ) v charge = 2.5v to 5vv batt =0v v cmd-reverse =0v or floating v cmd-pwm =0v or floating v cmd-mode =0v or floating 100 170 ma v charge = 2.5v to 9vv batt =0v v cmd-reverse =0v or floating v cmd-pwm =0v or floating v cmd-mode =0v or floating 100 200 i leakage precharge leakage current limit (from v batt to v charge , tested on v charge pin) v charge =0v v batt = 5.5v v cmd-reverse =0v or floating v cmd-pwm =0v or floating v cmd-mode =0v or floating 1 m a f mode precharge switch minimum frequency v charge = 2.5v to 9v v batt =0vtov charge v cmd-reverse =0v or floating v cmd-pwm =0v or floating v cmd-mode =0v to 1.9v at f mode 100 hz t on-off response time 100 m s t off-on response time 100 m s
st3s01led 8/18 electrical characteristics of charge switch (t a = -40 to 85c, unless otherwise specified.) electrical characteristics of cmd-pwm logic pin (t a =-40to85c,v charge = 2.5 to 9v unless otherwise specified.) symbol parameter test conditions min. typ. max. unit v charge charge block operating input voltage 2.5 12 v v drop dropout voltage v charge = 2.5v to 5v i charge =800ma v cmd-reverse =0v v cmd-pwm =0v v cmd-mode =1.9v 0.13 0.2 v i leakage precharge leakage current limit (from v batt to v charge , tested on v charge pin) v charge =0v v batt = 5.5v v cmd-reverse =0v v cmd-pwm =0v v cmd-mode =1.9v 1 m a v ih cmd-mode logic high (charge mode on) v charge = 2.5v to 5v i charge =10ma v cmd-reverse =0v v cmd-pwm =0v 1.2 v v il cmd-mode logic low (charge mode off) v charge = 2.5v to 5v i charge =10ma v cmd-reverse =0v v cmd-pwm =0v 0.4 v v th cmd-mode logic typical threshold v charge = 2.5v to 5v i charge =10ma v cmd-reverse =0v v cmd-pwm =0v 0.75 v i cmd-rev cmd-mode input current v charge =3vto5v i charge =10ma v cmd-reverse =0v v cmd-pwm =0v v cmd-mode =1.9v 130 m a f mode precharge switch minimum frequency v charge = 2.5v to 5v i charge =10ma v cmd-reverse =0v v cmd-pwm =0v v cmd-mode =0v to 1.9v at f mode 100 hz t on-off response time 100 m s symbol parameter test conditions min. typ. max. unit v ih cmd-pwm logic high (switch off) i precharge =10ma v cmd-reverse =0v v cmd-mode =0v 1.2 v v il cmd-pwm logic high (switch on) i precharge =10ma v cmd-reverse =0v v cmd-mode =0v 0.4 v v th cmd-pwm logic typical threshold i precharge =10ma v cmd-reverse =0v v cmd-mode =0v 0.75 v i cmd-pwm cmd-pwm input current i precharge =10ma v cmd-reverse =0v v cmd-mode =0v v cmd-mode =1.9v 130 m a
st3s01led 9/18 electrical characteristics of charger detection block (t a = -40 to 85c, v charge =2.2to9v,v cmd-reverse = 0v or floating unless otherwise specified.) electrical characteristics of flag detection block (t a =-40 to 85c, v charge =2.2 to 9v unless otherwise specified.) electrical characteristics of overload protection (t a =-40 to 85c, v charge >3v, v charge >v batt ,v cmd-reverse =0v, v cmd-pwm =0v, v cmd-mode =0v to 1.9v, unless otherwise specified.) symbol parameter test conditions min. typ. max. unit v charge charger detection block operating input voltage 2.2 v v charge-th low voltage threshold with falling edge 2.425 2.5 2.575 v v charge-hys low voltage hysteresis with rising edge, t a =25c 100 mv v charger-ok charger-ok output voltage low v charge =3v i charger-ok =1ma 0.2 0.4 v v charger-ok charger-ok output voltage low v flag = 0.2v i charger-ok =1ma v cmd-reverse =1.9v 0.2 0.4 v i charger-ok charger-ok output leakage current v charge = 2.2v v charger-ok =10v 0 1 m a i charger-ok charger-ok output leakage current v flag = 0.2v v charger-ok =10v v cmd-reverse =1.9v 01 m a symbol parameter test conditions min. typ. max. unit v charge flag detection block operating input voltage 2.2 v v vcharge- vbatt flag (v charge -v batt ) voltage low v flag = 0.2v i flag =1ma 0.2 0.45 v i vcharge- vbatt flag (v charge -v batt ) leakage current v flag = 0.2v i flag =10ma 1 a v vcharge- vbatt flag* (v charge -v batt ) voltage low i charge =20ma i flag =1ma 0.2 0.45 v i vcharge- vbatt flag* (v charge -v batt ) leakage current v batt =v charge v flag = 10v 1 m a * guaranteed by design symbol parameter test conditions min. typ. max. unit v batt battery input threshold with rising edge 5.4 5.6 5.9 v t on-off response time switches on to off, t a = 25c 100 m s
st3s01led 10/18 i.c. consumption (t a =-40 to 85c, v charge st3s01led 11/18 figure 3 : current consumption vs temperature figure 4 : precharge drop voltage vs temperature figure 5 : reverse drop voltage vs temperature figure 6 : v batt leakage current vs temperature figure 7 : reverse current consumption vs temperature figure 8 : cmd-mode logic threshold vs temperature
st3s01led 12/18 figure 9 : command pwm logic threshold vs temperature figure 10 : cmd-mode input current vs temperature figure 11 : command reverse logic vs temperature figure 12 : cmd-reverse input current vs temperature figure 13 : cmd-pwm input current vs temperature figure 14 : charger ok voltage vs temperature
st3s01led 13/18 figure 15 : charger ok voltage vs temperature figure 16 : charger ok voltage thresold vs temperature figure 17 : flag voltage low vs temperature figure 18 : minimum battery current vs temperature figure 19 : minimum battery current vs temperature figure 20 : overvoltage protection vs temperature
st3s01led 14/18 figure 21 : dynamic precharge mode
st3s01led 15/18 dim. mm. inch min. typ max. min. typ. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 d1 according to pad size e 3.80 4.00 0.150 0.157 e1 according to pad size e 1.27 0.050 h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k ? (max.) ddd 0.1 0.04 so-8 (exposed pad) mechanical data 7195016/b 8
st3s01led 16/18 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 8.1 8.5 0.319 0.335 bo 5.5 5.9 0.216 0.232 ko 2.1 2.3 0.082 0.090 po 3.9 4.1 0.153 0.161 p 7.9 8.1 0.311 0.319 tape & reel so-8 mechanical data
st3s01led 17/18 o rmation furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the n sequences of use of such information nor for any infringement of patents or other rights of third parties which may result from use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications e ntioned in this publication are subject to change without notice. this publication supersedes and replaces all information e viously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or s tems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies ustralia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom - united states. ? http://www.st.com
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