BQ25708 datasheet(6/77 Pages) TI2

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bq25708

SLUSCU2 – NOVEMBER 2017

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Pin Functions (continued)

I/O

DESCRIPTION

NAME

NUMBER

SRP

PWR

Charge current sense resistor positive input. Connect 0.1-μF ceramic capacitor from SRP to

SRN to provide differential mode filtering. The leakage current on SRP and SRN are

matched. For reverse battery plug-in protection, 10-Ω series resistors are placed on SRP and

SRN. Connect SRP pin with optional 0.1-uF ceramic capacitor to GND for common-mode

filtering.

SW1

PWR

Buck mode high side power MOSFET driver source. Connect to the source of the high side

n-channel MOSFET.

SW2

PWR

Boost mode high side power MOSFET driver source. Connect to the source of the high side

n-channel MOSFET.

VBUS

PWR

Charger input voltage. An input low pass filter of 1 Ω and 0.47 µF (minimum) is

recommended.

VDDA

PWR

Internal reference bias pin. Connect a 10-Ω resistor from REGN to VDDA and a 1-μF

ceramic capacitor from VDDA to power ground.

VSYS

PWR

Charger system voltage sensing. The system voltage regulation limit is programmed in

REG0x15() and REG0x3E().

Thermal pad

–

Exposed pad beneath the IC. Analog ground and power ground star-connected near the IC's

ground. Always solder thermal pad to the board, and have vias on the thermal pad plane

connecting to power ground planes. It also serves as a thermal pad to dissipate the heat.

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