Datasheet

PACK
PMS
CHG
REG2
3.3V
ChargeCurrent
0-VandPrechgCurrent
Quick-ChargeCurrent
BatteryVoltage
DSG
0 A
0V
0V
0V
OVChargeand
PrechargeMode
Quick-
Charge
Mode
0V
L
0V
L
OperatingVoltage
0VChargeDisableVoltage
CHG=L by0VChargeControl
DSG=L by0VChargeControl
T0381-01
8.22.2 0-V/Precharge FET in Host Control Mode
bq77PL900
SLUS844B – JUNE 2008 – REVISED JANUARY 2009 ...................................................................................................................................................... www.ti.com
Figure 28. Signal Timing of Pins During 0-V/Precharging
In this configuration, the charger does not have a requirement to support a precharge function. Thus, the host
controller and bq77PL900 must limit the fast charging current to a suitable 0-V/precharge level.
The PMS pin is connected to GND and a 0-V/precharge current flows through a dedicated 0-V/precharge FET
(PCHG FET).
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