bq2406x
www.ti.com
SLUS689A – JUNE 2006 – REVISED OCTOBER 2006
1A SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC
WITH THERMAL REGULATION
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
DESCRIPTION
Ideal for Low-Dropout Designs for Single-Cell
Li-Ion or Li-Pol Packs in Space Limited
Applications
Integrated Power FET and Current Sensor for
up to 1-A Charge Applications
Reverse Leakage Protection Prevents Battery
Drainage
±0.5% Voltage Regulation Accuracy
Thermal Regulation Maximizes Charge Rate
Charge Termination by Minimum Current and
Time
Precharge Conditioning With Safety Timer
Status Outputs for LED or System Interface
Indicate Charge, Fault, and Power Good
Outputs
Short-Circuit and Thermal Protection
Automatic Sleep Mode for Low Power
Consumption
Small 3×3 mm MLP Package
Selectable Battery Insertion and Battery
Absent Detection
Input Overvoltage Protection
– 6.5 V and 10.5 V Options
The bq2406x series are highly integrated Li-Ion and
Li-Pol linear chargers, targeted at space-limited
portable applications. The bq2406x series offers a
variety of safety features and functional options,
while still implementing a complete charging system
in a small package. The battery is charged in three
phases: conditioning, constant or thermally regulated
current, and constant voltage. Charge is terminated
based
on
minimum
current.
An
internal
programmable charge timer provides a backup
safety feature for charge termination and is
dynamically adjusted during the thermal regulation
phase. The bq2406x automatically re-starts the
charge if the battery voltage falls below an internal
threshold; sleep mode is set when the external input
supply is removed. Multiple versions of this device
family enable easy design of the bq2406x in cradle
chargers or in the end equipment, while using low
cost or high-end AC adapters.
Pin Out
(Top View)
bq24061
IN
1
10
OUT
TMR
2
9
BAT
STAT1
3
8
CE
STAT2
4
7
PG
VSS
5
6
ISET
APPLICATIONS
•
•
PDA, MP3 Players, Digital Cameras
Internet Appliances and Handheld Devices
TYPICAL APPLICATION CIRCUIT
Li-lon or Li-Pol
Battery Pack
bq24061
Input Power
1
RTMR
4.7 mF
1.5 kW
1.5 kW
2
IN
OUT
TMR
BAT
49.9 kW
3
4
5
STAT1
CE
STAT2
PG
VSS
ISET
Pack+
10
4.7 mF
9
+
Pack-
8
7
6
RSET
1.13 kW
Typical Application for Charging Between 350 mA and 1 A.
Charge Enable and
Input Power Status
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.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated