BQ24230 Datasheet, PDF (1/33 Pages) Texas Instruments – USB-FRIENDLY LITHIUM-ION BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

bq24230
bq24232
www.ti.com .......................................................................................................................................... SLUS821A – OCTOBER 2008 – REVISED DECEMBER 2008
USB-FRIENDLY LITHIUM-ION BATTERY CHARGER AND POWER-PATH MANAGEMENT IC
FEATURES
1
•2 Fully Compliant USB Charger
– Selectable 100-mA and 500-mA Maximum
Input Current
– 100-mA Maximum Current Limit Ensures
Compliance to USB-IF Standard
– Input-based Dynamic Power Management
(V_IN-DPM) for Protection Against Poor USB
Sources
• 28-V Input Rating With Overvoltage Protection
• Integrated Dynamic Power-Path Management
(DPPM) Function Simultaneously and
Independently Powers the System and
Charges the Battery
• Supports up to 500-mA Charge Current With
Current Monitoring Output (ISET)
• Programmable Input Current Limit up to
500 mA for Wall Adapters
• Programmable Termination Current (bq24232)
• Programmable Precharge and Fast-Charge
Safety Timers
• Reverse Current, Short-Circuit, and Thermal
Protection
• NTC Thermistor Input
• Proprietary Start-Up Sequence Limits Inrush
Current
• Status Indication – Charging/Done, Power
Good
• Small 3 mm × 3 mm 16-Lead QFN Package
APPLICATIONS
• Bluetooth™ Devices
• Low-Power Handheld Devices
TYPICAL APPLICATION CIRCUIT
1 kΩ
1 kΩ
Adaptor
DC
1mF
GND
IN
13
8 VSS
bq24230
15 TD
OUT 10
11
EN2 5
BAT 2
3
TS ¹
4.7mF
4.7mF
TEMP
PACK+
SYSTEM
2.94 kΩ 4.32 kΩ
PACK-
DESCRIPTION
The bq2423x series of devices are highly integrated Li-ion linear chargers and system power-path management
devices targeted at space-limited portable applications. The devices operate from either a USB port or ac
adapter and support charge currents between 25 mA and 500 mA. The high-input-voltage range with input
overvoltage protection supports low-cost, unregulated adapters. The USB input current limit accuracy and
start-up sequence allow the bq2423x to meet USB-IF inrush current specification. Additionally, the input dynamic
power management (V_IN-DPM) prevents the charger from crashing poorly designed or incorrectly configured USB
sources.
The bq2423x features dynamic power-path management (DPPM) that powers the system while simultaneously
and independently charging the battery. The DPPM circuit reduces the charge current when the input current
limit causes the system output to fall to the DPPM threshold, thus supplying the system load at all times while
monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on
the battery, allows for proper charge termination, and enables the system to run with a defective or absent
battery pack. Additionally, this enables instant system turn-on even with a totally discharged battery. The
power-path management architecture also permits the battery to supplement the system current requirements
when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.
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.
Bluetooth is a trademark of Bluetooth SIG, Inc..
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 © 2008, Texas Instruments Incorporated