BQ25700A Datasheet, PDF (6/82 Pages) Texas Instruments – SMBus Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

bq25700A
SLUSCQ8 – 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
REG0x15() and REG0x3E().
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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