PQ25181DLHT datasheet(13/43 Pages) TI

13 / 43 page

Termination is only enabled when the charger CV loop is active in fast charge operation. Termination is disabled

if the charge current reaches ITERM while the VINDPM, DPPM, or thermal regulation loops are active. The

charger will only go into the termination when the current drops to ITERM due to the battery reaching the target

voltage and not due to the charge current limitation imposed by the previously mentioned controlled loops.

Post termination, the battery FET is disabled and the voltage on BAT pin is monitored to check if it has dropped

to the VRCH threshold. If it does, a new charge cycle is established. The safety timers are reset. During charging

or even when charge is done, a higher SYS load will be supported through the supplement operation.

The following figure illustrates the charging process flow.

VBAT < VLOWV

VBAT > VBATSC

Start Precharge

Connect VIN

Precharge safety timer

expired?

Stop Charging and

interrupt

Charging or VIN toggled

VBAT > VLOWV

Start FastCharge

Icharge set by I2C

IBAT < ITERM

Fast Charge

safety timer

expired?

Charge Done (Set

bit, interrupt, and

disconnect

BATFET)

VBAT < VRCH

Yes

Figure 8-2. Charger Flow Diagram

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BQ25181

SLUSEH3 – APRIL 2022

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PQ25181DLHT Datasheet(PDF) 13 Page - Texas Instruments