BQ25708 datasheet(6/94 Pages) TI2

6 / 94 page

7 Pin Configuration and Functions

VBUS

HIDRV2

ACN

SW2

ACP

VSYS

CHRG_OK

BATDRV

OTG/VAP

SRP

ILIM_HIZ

SRN

VDDA

CELL_BATPRESZ

IADPT

COMP2

Thermal

Pad

Figure 7-1. RSN Package 32-Pin WQFN Top View

Table 7-1. Pin Functions

I/O

DESCRIPTION

NAME

NO.

ACN

PWR

Input current sense resistor negative input. The leakage on ACP and ACN are matched. A

R-C low-pass filter is required to be placed between the sense resistor and the ACN pin

to suppress the high frequency noise in the input current signal. Refer to Section 10 for

ACP/ACN filter design.

ACP

PWR

Input current sense resistor positive input. The leakage on ACP and ACN are matched. A

R-C low-pass filter is required to be placed between the sense resistor and the ACP pin

to suppress the high frequency noise in the input current signal. Refer to Section 10 for

ACP/ACN filter design.

BATDRV

P-channel battery FET (BATFET) gate driver output. It is shorted to VSYS to turn off the

BATFET. It goes 10 V below VSYS to fully turn on BATFET. BATFET is in linear mode to

regulate VSYS at minimum system voltage when battery is depleted. BATFET is fully on

during fast charge and works as an ideal-diode in supplement mode.

BTST1

PWR

Buck mode high side power MOSFET driver power supply. Connect a 0.047-µF capacitor

between SW1 and BTST1. The bootstrap diode between REGN and BTST1 is integrated.

BTST2

PWR

Boost mode high side power MOSFET driver power supply. Connect a 0.047-μF capacitor

between SW2 and BTST2. The bootstrap diode between REGN and BTST2 is integrated.

CELL_BATPRESZ

Battery cell selection pin for 1–4 cell battery setting. CELL_BATPRESZ pin is biased from

VDDA. CELL_BATPRESZ pin also sets SYSOVP thresholds to 5 V for 1-cell, 12 V for 2-cell,

and 19.5 V for 3-cell/4-cell. CELL_BATPRESZ pin is pulled below VCELL_BATPRESZ_FALL to

indicate battery removal. The device exits LEARN mode, and disables charge. The charge

voltage register REG0x05/04() goes back to default.

BQ25713, BQ25713B

SLUSD83C – JUNE 2018 – REVISED MAY 2023

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