www.ti.com
...............................................................................................................................................................
SLUS943A – MAY 2009 – REVISED JUNE 2009
Over-Voltage and Over-Current Charger Front-end
Protection IC With Integrated Charging FET
1
FEATURES
•
Robust Protection
– Input Over-Voltage Protection
– Input Over-Current Protection
– Accurate Battery Over-Voltage Protection
– Thermal Shutdown
– Output Short-Circuit Protection
•
Integrated Charging FET
•
LDO Mode Operation
•
Current Limited Power Supply for Host
Controller
2
•
•
•
•
•
•
•
Soft-Start to Prevent Inrush Currents
Soft-Stop to Prevent Voltage Spikes
30V Maximum Input Voltage
Supports Up to 1A Load Current
Small 2mm × 2mm 8pin SON Package
APPLICATIONS
Mobile Phones
Low-Power Handheld Devices
DESCRIPTION
The bq24350/2 is a highly integrated circuit designed to provide protection to Li-ion batteries from failures of the
charging circuit. The IC continuously monitors the input voltage and the battery voltage. In case of an input
over-voltage condition, the IC will turn off the internal power FET after a blanking time. If the battery voltage rises
to unsafe levels during charging process, power is removed from the system. If the input current exceeds the
over current threshold for a limited time, the IC will turn off the output power. The integrated charging FET can
regulate the charge voltage and current according to the control from the host. The device can also provide a
voltage source with over voltage and over current protection for host controller.
WHITE SPACE
WHITE SPACE
WHITE SPACE
TYPICAL APPLICATION CIRCUIT
WHITE SPACE
PIN ASSIGNMENT
WHITE SPACE
bq24350 /2
ACIN
AC
C
ACIN
1
mF
Q2
GATDRV
Q1
C
CHGIN
1
mF
CHG IN
BB
ACIN
1
8
OUT
OUT
CHGIN
GATDRV
CHGIN
ACIN
GND
2
7
3
6
GATDRV
OUT
0 .2
W
R
BAT
200 kW
VBAT
PACK+
PACK-
VBAT
4
5
ISENS
GND
VBAT
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
Copyright © 2009, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
