BQ25700A Datasheet, PDF (4/82 Pages) Texas Instruments – SMBus Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

bq25700A
SLUSCQ8 – MAY 2017
6 Pin Configuration and Functions
RSN Package
32-Pin WQFN
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VBUS
1
ACN
2
ACP
3
CHRG_OK
4
EN_OTG
5
ILIM_HIZ
6
VDDA
7
IADPT
8
Thermal
Pad
24
HIDRV2
23
SW2
22
VSYS
21
BATDRV
20
SRP
19
SRN
18
CELL_BATPRESZ
17
COMP2
PIN
NAME
NUMBER
ACN
2
ACP
3
BATDRV
21
BTST1
30
BTST2
25
CELL_BATPRESZ
18
I/O
PWR
PWR
O
PWR
PWR
I
Pin Functions
DESCRIPTION
Input current sense resistor negative input. The leakage on ACP and ACN are matched. The
series resistors on the ACP and ACN pins are placed between sense resistor and filter cap.
Refer to Application and Implementation for ACP/ACN filter design.
Input current sense resistor positive input. The leakage on ACP and ACN are matched. The
series resistors on the ACP and ACN pins are placed between sense resistor and filter cap.
Refer to Application and Implementation for ACP/ACN filter design.
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 supplement mode.
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.
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.
Battery cell selection pin for 1–4 cell battery setting. CELL_BATPRESZ pin is biased from
VDDA. CELL_BATPRESZ pin also sets SYSOVP threshold to 5 V for 1-cell, 12 V for 2-cell ,
18.5 V for 3-cell, and 19.5 for 4-cell. CELL_BATPRESZ pin is pulled below
V_{CELL_BATPRESZ_FALL} to indicate battery removal. The device exits LEARN mode, and
disables charge. REG0x15() goes back to default.
4
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