BQ25703A Datasheet, PDF (6/81 Pages) Texas Instruments – I2C Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

bq25703A
SLUSCU1 – MAY 2017
PIN
NAME
NUMBER
SRN
19
SRP
20
SW1
32
SW2
23
VBUS
1
VDDA
7
VSYS
22
Thermal pad
–
I/O
PWR
PWR
PWR
PWR
PWR
PWR
PWR
–
Pin Functions (continued)
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DESCRIPTION
Charge current sense resistor negative input. SRN pin is for battery voltage sensing as well.
Connect SRN pin with optional 0.1-μF ceramic capacitor to GND for common-mode filtering.
Connect a 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.
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.
Buck mode high side power MOSFET driver source. Connect to the source of the high side
n-channel MOSFET.
Boost mode high side power MOSFET driver source. Connect to the source of the high side
n-channel MOSFET.
Charger input voltage. An input low pass filter of 1Ω and 0.47 µF (minimum) is
recommended.
Internal reference bias pin. Connect a 10-Ω resistor from REGN to VDDA and a 1-μF
ceramic capacitor from VDDA to power ground.
Charger system voltage sensing. The system voltage regulation limit is programmed in
REG0x05/04() and REG0X0D/0C().
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.
6
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