BQ25708 datasheet(31/94 Pages) TI2

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battery configuration will change with CELL pin voltage. When SYSOVP happens, the device latches off the

converter. REG0x20[4] is set to 1. The user can clear latch-off by either writing 0 to the SYSOVP bit or removing

and plugging in the adapter again. After latch-off is cleared, the converter starts again.

9.3.10.5 Battery Overvoltage Protection (BATOVP)

Battery over-voltage may happen when battery is removed during charging or the user plugs in a wrong battery.

The BATOVP threshold is 104% (1 s) or 102% (2 s to 4 s) of regulation voltage set in REG0x05/04().

9.3.10.6 Battery Short

If BAT voltage falls below SYSMIN during charging, the maximum current is limited to 384 mA.

9.3.10.7 System Short Hiccup Mode

VSYS pin is monitoring the system voltage, when Vsys is lower than 2.4V, after 2ms deglitch time, the charger

will be shut down for 500ms. The charger will restart for 10ms and measure Vsys again, if it is still lower than

2.4V, the charger will be shut down again. This hiccup mode will be tried continuously, if the charger restart is

failed for 7 times in 90 second, the charger will be latched off. REG0x20[3] will be set to 1 to report a system

short fault. The charger only can be enabled again once the host writes REG0x20[3]= 0.

The charger system short hiccup mode can be disabled by writing REG0x00[6]= 1.

9.3.10.8 Thermal Shutdown (TSHUT)

The WQFN package has low thermal impedance, which provides good thermal conduction from the silicon to

the ambient, to keep junction temperatures low. As added level of protection, the charger converter turns off for

self-protection whenever the junction temperature exceeds the 155°C. The charger stays off until the junction

temperature falls below 135°C. During thermal shut down, the LDO current limit is reduced to 16 mA and REGN

LDO stays off. When the temperature falls below 135°C, charge can be resumed with soft start.

9.4 Device Functional Modes

9.4.1 Forward Mode

When input source is connected to VBUS, BQ25713/BQ25713B is in forward mode to regulate system and

charge battery.

9.4.1.1 System Voltage Regulation with Narrow VDC Architecture

BQ25713/BQ25713B employs Narrow VDC architecture (NVDC) with BATFET separating system from battery.

The minimum system voltage is set by MinSystemVoltage(). Even with a deeply depleted battery, the system is

regulated above the minimum system voltage.

When the battery is below minimum system voltage setting, the BATFET operates in linear mode (LDO mode).

As the battery voltage rises above the minimum system voltage, BATFET is fully on when charging or in

supplement mode and the voltage difference between the system and battery is the VDS of BATFET. System

voltage is regulated 160 mV above battery voltage when BATFET is off (no charging or no supplement current).

The BATDRV pin is only able to drive a battery MOSFET with Ciss lower than 5nF. The Ciss in the range of

1nF~3nF is recommended.

See Section 9.6.5.1 for details on system voltage regulation and register programming.

9.4.1.2 Battery Charging

BQ25713/BQ25713B charges 1-4 cell battery in constant current (CC), and constant voltage (CV) mode.

Based on CELL_BATPREZ pin setting, the charger sets default battery voltage 4.2V/cell to ChargeVoltage(), or

REG0x05/04(). According to battery capacity, the host programs appropriate charge current to ChargeCurrent(),

or REG0x03/02(). When battery is full or battery is not in good condition to charge, host terminates charge by

setting REG0x00[0] to 1, or setting ChargeCurrent() to zero.

See Section 9.3 for details on register programming.

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BQ25713, BQ25713B

SLUSD83C – JUNE 2018 – REVISED MAY 2023

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