BQ24040 Datasheet, PDF (1/31 Pages) Texas Instruments – 800mA Single-Input Single Cell Li-Ion Battery Charger With Auto Start

bq24040
bq24041
www.ti.com.................................................................................................................................... SLUS941A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009
800mA, Single-Input, Single Cell Li-Ion Battery Charger With Auto Start
Check for Samples: bq24040 bq24041
FEATURES
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• CHARGING
– 1% Charge Voltage Accuracy
– 10% Charge Current Accuracy
– Pin Selectable USB 100mA and 500mA
Maximum Input Current Limit
– Programmable Termination and Precharge
Threshold, bq24040
• PROTECTION
– 30V Input Rating; with 6.6V or 7.1V Input
Overvoltage Protection
– Input Voltage Dynamic Power Management
– 125°C Thermal Regulation; 150°C Thermal
Shutdown Protection
– OUT Short-Circuit Protection and ISET
short detection
– Operation over JEITA Range via Battery
NTC – 1/2 Fast-Charge-Current at Cold,
4.06V at Hot, bq24040
– Fixed 10 Hour Safety Timer
• SYSTEM
– Automatic Termination and Timer Disable
Mode (TTDM) for Absent Battery Pack With
Thermistor, bq24040
– Status Indication – Charging/Done
– Available in Small 2×2mm² DFN-10 Package
– Integrated Auto Start Function for
Production Line Testing, bq24041
APPLICATIONS
• Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
DESCRIPTION
The bq2404x series of devices are highly integrated Li-ion linear chargers devices targeted at space-limited
portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range
with input overvoltage protection supports low-cost unregulated adapters.
The bq2404x has a single power output that charges the battery. A system load can be placed in parallel with the
battery as long as the average system load does not keep the battery from charging fully during the 10 hour
safety timer.
The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases,
an internal control loop monitors the IC junction temperature and reduces the charge current if an internal
temperature threshold is exceeded.
1.5kW
Adaptor
DC+
GND
OR
USB Port
VBUS
GND
D+
D-
1kW
1mF
2kW
bq24040
1 IN
2 ISET
3 VSS
OUT 10
1.5kW
TS 9
CHG 8
Battery Pack
++
4 PRETERM ISET2 7
5 PG
NC 6
Disconnect after Detection
System Load
1mF
VDD
TTDM/BAT_EN
ISET/100/500mA
GND
D+
D-
Host
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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 © 2009, Texas Instruments Incorporated