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bq24351 Datasheet Preview

bq24351 Datasheet

Over-Voltage and Over-Current Charger Protection IC

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bq24351
www.ti.com
SLUSA62A – OCTOBER 2010 – REVISED NOVEMBER 2010
Over-Voltage and Over-Current Charger
Protection IC With Integrated Charging FET and LDO Mode
Check for Samples: bq24351
FEATURES
1
2 Robust Protection
– Input Over-Voltage Protection
– Input Over-Current Protection
– Accurate Battery Over-Voltage Protection
– Thermal Shutdown
– Output Short-Circuit Protection
• Integrated Charging FET
• 10.5V Over-Voltage Protection
• LDO Mode Operation
– 6.38V Output Voltage Regulation
• Current Limited Power Supply for Host
Controller
• 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 bq24351 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
AC
CACIN
1 mF
TYPICAL APPLICATION CIRCUIT
WHITE SPACE
ACIN
bq24351
Q1
Q2
GND
CHG IN
GATDRV
OUT
VBAT
CCHGIN
1 mF
Analog
Base Band
Chip
CHGIN
GATDRV
0.2 W
R BAT
200 kW
ISENS
VBAT
PACK+
PACK-
PIN ASSIGNMENT
WHITE SPACE
ACIN 1
ACIN 2
GND 3
VBAT 4
8 OUT
7 OUT
6 CHGIN
5 GATDRV
1
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.
2
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.
Copyright © 2010, Texas Instruments Incorporated




etcTI

bq24351 Datasheet Preview

bq24351 Datasheet

Over-Voltage and Over-Current Charger Protection IC

No Preview Available !

bq24351
SLUSA62A – OCTOBER 2010 – REVISED NOVEMBER 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
ACIN
GND
VBAT
VACIN
VACIN
VUVLO
+
-
VACIN
VOVP
VACIN
V OUT
V BAT
BVOVP
VBAT
+
-
+
-
+
-
INPUT UVLO
t BLK ( CHGIN )
INPUT OVP
t DGL(OVP )
SLEEP
Battery OVP
t DGL (BOVP )
Q1
Protection &
Gate Control
Control
L ogic
Thermal
Shutdown
Q2
IIN
+
-
IO(OCP)
VCHGIN
+
- VOREG
CHGIN Discharge
Protection
Control
V OUT
500 W
OUT
CHGIN
GATDRV
PIN
NAME
ACIN
NO.
1,2
OUT
VBAT
7,8
4
GATDRV
CHGIN
5
6
GND
3
Thermal PAD
PIN FUNCTIONS
I/O DESCRIPTION
I Power Supply Input, connect to an external DC supply. Connect an external 1-mF ceramic capacitor
(minimum) to GND.
O Output terminal to the charging system.
I Battery voltage sense input. Connected to pack positive terminal through a resistor. Connected to ground if
battery OVP function is not used.
I P-FET gate drive input , connected to gate drive pin of the host charger controller
O Output power pin for power input of host charger controller. Connect an external ceramic bypass capacitor
(1.0-mF minimum) to GND.
– Ground terminal
There is an internal electrical connection between the exposed thermal pad and the GND pin of the device.
The thermal pad must be connected to the same potential as the GND pin on the printed circuit board. Do not
use the thermal pad as the primary ground input for the device. GND pin must be connected to ground at all
times.
PART NUMBER
bq24351DSGR
bq24351DSGT
MARKING
QUO
QUO
ORDERING INFORMATION(1)
MEDIUM
QUANTITY
Tape and Reel
Tape and Reel
3000
250
PACKAGE
2mm × 2mm SON
2mm × 2mm SON
INPUT OVP
THRESHOLD
10.5 V
10.5 V
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
2 Submit Documentation Feedback
Product Folder Link(s): bq24351
Copyright © 2010, Texas Instruments Incorporated


Part Number bq24351
Description Over-Voltage and Over-Current Charger Protection IC
Maker etcTI
Total Page 19 Pages
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