BQ25120A Datasheet, PDF (4/67 Pages) Texas Instruments – Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT

bq25120A
SLUSD08 – MAY 2017
7 Pin Configuration and Functions
YFP Package
25-Pin (DSBGA)
Top View
1
2
3
4
5
A
GND
IN
PMID
SW
PGND
B
BAT
BAT
PMID
VINLS
SYS
C
ISET
ILIM
TS
VINLS
LS/LDO
D
IPRETE
RM
INT
RESET
/PG
GND
E
/MR
/CD
LSCTRL
SDA
SCL
www.ti.com
NAME
IN
PIN
NO.
A2
PMID
GND
PGND
A3, B3
A1, D5
A5
CD
E2
SDA
E4
SCL
E5
ILIM
C2
LSCTRL
E3
ISET
C1
Pin Functions
I/O
DESCRIPTION
I
DC Input Power Supply. IN is connected to the external DC supply. Bypass IN to GND with
at least 1 µF of capacitance using a ceramic capacitor.
High Side Bypass Connection. Connect at least 3µF of ceramic capacitance with DC bias
I/O
derating from PMID to GND as close to the PMID and GND pins as possible. When entering
Ship Mode, PMID is discharged by a 20-kΩ internal discharge resistor.
Ground connection. Connect to the ground plane of the circuit.
Power ground connection. Connect to the ground plane of the circuit. Connect the output
filter cap from the buck converter to this ground as shown in the layout example.
Chip Disable. Drive CD low to place the part in High-Z mode with battery only present, or
I
enable charging when V_IN is valid. Drive CD high for Active Battery mode when battery only
is present, and disable charge when V_IN is present. CD is pulled low internally with 900 kΩ.
I/O
I²C Interface Data. Connect SDA to the logic rail through a 10-kΩ resistor.
I
I²C Interface Clock. Connect SCL to the logic rail through a 10-kΩ resistor.
Adjustable Input Current Limit Programming. Connect a resistor from ILIM to GND to
I
program the input current limit. The input current includes the system load and the battery
charge current. Connect ILIM to GND to set the input current limit to the internal default
threshold. ILIM can also be updated through I²C.
I
Load Switch and LDO Control Input. Pull high to enable the LS/LDO output, pull low to
disable the LS/LDO output.
Fast-Charge Current Programming Input. Connect a resistor from ISET to GND to program
the fast-charge current level. Connect a resistor from ISET to GND to set the charge current
I
to the internal default. ISET can also be updated through I²C. While charging, the voltage at
ISET reflects the actual charging current and can be used to monitor charge current if an
ISET resistor is present and the device is not in host mode.
4
Submit Documentation Feedback
Product Folder Links: bq25120A
Copyright © 2017, Texas Instruments Incorporated