BQ24085_17 Datasheet, PDF (1/42 Pages) Texas Instruments – 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC With Thermal Regulation

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bq24085, bq24086, bq24087, bq24088
SLUS784E – DECEMBER 2007 – REVISED DECEMBER 2015
bq2408x 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC
With Thermal Regulation
1 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
3 Description
The bq2408x series are highly integrated Li-Ion and
Li-Pol linear chargers, targeted at space-limited
portable applications. The bq2408x series offers a
variety of protection 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
protection feature for charge termination and is
dynamically adjusted during the thermal regulation
phase. The bq2408x 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 bq2408x in cradle chargers
or in the end equipment, while using low cost or high-
end AC adapters.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq2408x
VSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2 Applications
• PDA, MP3 Players, Digital Cameras
• Internet Appliances and Handheld Devices
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
RSET
1.13 kW
Li-Ion or Li-Pol
Battery Pack
Pack+
C2
1 mF
+
Pack-
Charge Enable
and Power Good
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.