BQ24232RGTR Texas Instruments 电池管理 USB Friendly 0.5A Li Charger

Features

1• 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

(VIN- 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

2 Applications

• Bluetooth™ Devices

• Low-Power Handheld Devices

3 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-inputvoltage

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 (VIN-DPM) prevents the charger from

crashing poorly designed or incorrectly configured

USB sources.