BQ24085 Datasheet, PDF (1/34 Pages) Texas Instruments – 750 mA SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC WITH THERMAL REGULATION

bq24085, bq24086
bq24087, bq24088
www.ti.com .................................................................................................................................................... SLUS784B – DECEMBER 2007 – REVISED MAY 2008
750 mA SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC
WITH THERMAL REGULATION
FEATURES
1
• 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 750-mA 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
APPLICATIONS
• PDA, MP3 Players, Digital Cameras
• Internet Appliances and Handheld Devices
DESCRIPTION
The bq24085/6/7/8 series are highly integrated Li-Ion
and Li-Pol linear chargers, targeted at space-limited
portable applications. The bq24085/6/7/8 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
bq24085/6/7/8 automatically restarts 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 bq24085/6/7/8 in cradle
chargers or in the end equipment, while using low
cost or high-end AC adapters.
Pin Out
(Top View)
bq24085
IN ¹
TMR ²
STAT1 3
STAT2 4
V_SS 5
10 OUT
9 _BAT
8 _CE
7 _PG
6 _ISET
TYPICAL APPLICATION CIRCUIT
bq24085
Input Power
C3
4.7 mF
R1
1.5 kW
R2
1.5 kW
RED
1
RTMR
2
49.9 kW
3
IN
TMR
STAT 1
OUT ¹⁰
9
BAT
8
CE
GREEN
4
STAT 2
5
Vss
7
PG
ISET ⁶
Li-Ion or Li-Pol
Battery Pack
Pack+
C2
1 mF
+
Pack-
RSET
1.13 kW
Charge Enable
and Power Good
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.
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 © 2007–2008, Texas Instruments Incorporated