Datasheet

0-V/Precharge FER in Stand-Alone Mode
I-QC
I-QC:Quick-ChargeCurrent
CV
Charger
CHG
PACK
GPOD
PMS
REG
DSG
bq77PL900
Battery
BAT
DSG-FET CHG-FET
PCHG-FET
R
(PCHG)
S0354-01
PACK+
CC
bq77PL900
www.ti.com ...................................................................................................................................................... SLUS844B – JUNE 2008 – REVISED JANUARY 2009
The circuit configuration is the same as 0-V/precharge FET in host-control mode, although in stand-alone mode
the bq77PL900 automatically turns on the GPOD output. When the battery voltage reaches 0 V, the charger
disable voltage (= PMS disable voltage), the GPOD output is turned OFF, and then the DSG and CHG FETs are
controlled by an internal UV comparator function. To activate this mode, set OCDELAY register [ZVC].
Figure 32. 0-V/Precharge FET Circuit Diagram In Stand-Alone Mode
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