BQ25302 datasheet(17/38 Pages) TI

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8.3.3 Charging Status Indicator (STAT)

The device indicates charging state on the open drain STAT pin. The STAT pin can drive a LED that is pulled up

to REGN rail through a current limit resistor.

Table 8-2. STAT Pin State

CHARGING STATE

STAT INDICATOR

Charging in progress (including recharge)

LOW

Charging complete

HIGH

HiZ mode, sleep mode, charge disable

HIGH

Safety timer expiration with battery voltage above recharge threshold

HIGH

Charge faults:

1. VBUS input over voltage

2. TS cold/hot faults

3. Battery over voltage

4. IC thermal shutdown

5. Safety timer expiration with battery voltage below recharge threshold

6. ICHG pin open or short

BLINKING at 1 Hz

with 50% duty cycle

8.3.4 Protections

8.3.4.1 Voltage and Current Monitoring

The device closely monitors the input voltage and input current for safe operation.

8.3.4.1.1 Input Over-Voltage Protection

This device integrates the functionality of an input over-voltage protection (OVP). The input OVP threshold is V

VBUS_OVP_RISE. During an input over-voltage event, the converter stops switching and safety timer stops counting

as well. The converter resumes switching and the safety timer resumes counting once the VBUS voltage drops

back below (VVBUS_OVP_RISE - VVBUS_OVP_HYS). The REGN LDO remains on during an input over-voltage event.

The STAT pin blinks during an input OVP event.

8.3.4.1.2 Input Voltage Dynamic Power Management (VINDPM)

When the input current of the device exceeds the current capability of the power supply, the charger device

regulates PMID voltage by reducing charge current to avoid crashing the input power supply. VINDPM

dynamically tracks the battery voltage. The actual VINDPM is the higher of V INDPM_MIN and (1.044*VBAT +

125mV).

8.3.4.1.3 Input Current Limit

The device has built-in input current limit. When the input current is over the threshold IINDPM, the converter duty

cycle is reduced to reduce input current.

8.3.4.1.4 Cycle-by-Cycle Current Limit

High-side (HS) FET current is cycle-by-cycle limited. Once the HSFET peak current hits the limit IHSFET_OCP, the

HSFET shuts down until the current is reduced below a threshold.

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BQ25302

SLUSCZ3 – OCTOBER 2020

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