EXT9502 linear li - ion battery charger e - cmos corp. (ww w .e c mo s . c om.tw) 8 b0 7 n - rev. f001 1 / 6 general description e xt9502 series is a double lithium battery charge management chip. the chip includes a charge state detection, the charging process, temperature detection and so on . the chip also integrates a high - precision reference voltage module in it. it uses the sop - 8 package. e xt9502 charge contains three modes: pre - charge, constant current charging, constant voltage charging. constant current charging current is five times the pre - charge current; when the voltage is lower than 6.5v into the pre - charge mode; when the voltage is above 6.5v into the conatant cu rrent charge mode, the charging current is five times as the pre - charge, the charging current is dertermined by an external resistor. features double lithium battery charge management only need a few external compenents pre - charge, constant current charging, constant voltage charging mode temperature detection two charging status sop 8 package applications digital camera pdas the phone lithium battery ordering /marking informa tion EXT9502 xx x x x r tape & reel voltage accuracy a 1% b 2% voltage package 78=7.8v m1 sop8 80=8.0v 82=8.2v 84=8.4v 86=8.6v 88=8.8v part number package marking EXT9502xxm1r sop8
EXT9502 linear li - ion battery charger e - cmos corp. (ww w .e c mo s . c om.tw) 8 b0 7 n - rev. f001 2 / 6 ?? represents the batt central voltage value represents the v oltage accuracy xxxx represents the production batch pin assignment symbol voltage product name 780 7.80v e xt9502 78 m1xr 800 8.00v e xt950280 m1xr 820 8.20v e xt950282 m1xr 840 8.40v e xt950284 m1xr 860 8.60v e xt9502 86 m1xr 880 8.80v e xt9502 88 m1xr symbol voltage accuracy product name a 1% EXT9502xxm1ar b 2% EXT9502xxm1br pin number pin name function description 1 cs overcharge detection pin 2 done charge status pin1 3 chrg charge status pin2 4 vdd power input 5 drc external mos or pnp control pin 6 gnd ground 7 vt battery temperature detection pin 8 batt battery voltage detection
EXT9502 linear li - ion battery charger e - cmos corp. (ww w .e c mo s . c om.tw) 8 b0 7 n - rev. f001 3 / 6 block diagram absolute maximum ratings caution: the absolute maximum ratings are rated values exceeding which the product could suffer physical da mage. these values must therefore not be exceeded under any conditions. parameter symbol maximum rating unit input supply voltage v dd vss - 0.3 vss+18 v drc pin voltage vdrc vss - 0.3 vcc+18 bat pin voltage vbat vss - 0.3 12 cs pin voltage vcs vss - 0.3~6 chag pin voltage vchrg vss - 0.3 18 done pin voltage v done vss - 0.3~18 ntc pin voltage vntc vss - 0.3~6 operating ambient temperature topa - 40 +85 c storage temperature tstr - 65 +125
EXT9502 linear li - ion battery charger e - cmos corp. (ww w .e c mo s . c om.tw) 8 b0 7 n - rev. f001 4 / 6 electrical characteristics (ta=25 unless specified) typical application circuit note: d1 is a schot tky; rs has been suggested that high - precision ( 1% ) in order to ensure cur rent accuracy, r1 and r2 is not required precision. parameter symbol condition min typ max unit operating current 1 i dd
EXT9502 linear li - ion battery charger e - cmos corp. (ww w .e c mo s . c om.tw) 8 b0 7 n - rev. f001 5 / 6 typical performance characteristics function description when the input voltage vdd is below the uvlo lev el, the chip will enter into the sleep mode, the chip power consumption will down to 20a; when the vdd pin voltage rises above the uvlo voltage or more, the chip will into the chrg the mode, a charge cycle begins, early in the charge cycle, if the battery voltage is lower than the trickle charge threshold voltage (6.5v) the charger goes into trickle charge mode. the trickle charge current is internally set to 20% of the maximum charging current. when the battery voltage exceeds the trickle charge thres hold, the charger enters constant current charging mode, the charging current from the internal 100mv baseline and the external sense resistor to a decision. the chip also with battery temperature detection function, this function through the vt side, and in vt termination of a negative temperature coefficient 10k thermistor (dale nths1206n02), as the temperature rises to 80 degrees, the pin voltage is 50mv for low temperature to reach - 30 degrees, the point voltage of 2v, only there voltage in the range of the two voltage values, the chip in order to work properly, otherwise the charge is stopped, the led is not lit, this pin can be directly connected to shield of the temperature detection. charging status display in the t able below: no - load trickle charge high current charging fully charged ntc is not in the scope of state done green flicker off off on off charge red off on on off off
EXT9502 linear li - ion battery charger e - cmos corp. (ww w .e c mo s . c om.tw) 8 b0 7 n - rev. f001 6 / 6 package information sop8
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