1

FEATURES

APPLICATIONS

TYPICAL APPLICATION CIRCUIT

IN

VSS

BAT

DC

GND

Adaptor

bq24230

OUT

EN2

TS

TEMP

PACK+

PACK-

SYSTEM

TD

13

8

15

1

2

3

5

10

11

1mF

4.7mF

1 k

2.94 k

1 k

4.32 k

4.7mF

DESCRIPTION

bq24230

bq24232

USB-FRIENDLY LITHIUM-ION BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

2

• Fully Compliant USB Charger

• Proprietary Start-Up Sequence Limits Inrush

Current

–

Selectable 100-mA and 500-mA Maximum

Input Current

• Status Indication – Charging/Done, Power

Good

–

100-mA Maximum Current Limit Ensures

Compliance to USB-IF Standard

• Small 3 mm × 3 mm 16-Lead QFN Package

–

Input-based Dynamic Power Management

• Bluetooth™ Devices

Sources

• Low-Power Handheld Devices

• 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

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

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.

2

Bluetooth is a trademark of Bluetooth SIG, Inc..

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.