BQ24050

具有自动 AC/USB 检测功能的 800mA 单输入单节锂离子电池充电器。| 线性

The bq2405x series of devices are highly integrated Li-Ion and Li-Pol 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 bq2405x 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.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The precharge current and termination current threshold are programmed through an external resistor. The fast charge current value is also programmable through an external resistor.

.

Charging

.

1% Charge Voltage Accuracy

.

10% Charge Current Accuracy

.

Pin Selectable USB 100-mA and 500-mA

Maximum Input Current Limit

.

Programmable Termination and Precharge

Threshold

.

Protection

.

30-V Input Rating; With 6.6-V Input

Overvoltage Protection

.

Input Voltage Dynamic Power Management

.

125°C Thermal Regulation; 150°C

Thermal Shutdown Protection

.

OUT Short-Circuit Protection and ISETShort

Detection

.

Operation Over JEITA Range Through Battery

NTC – \xBD Fast-Charge-Current at Cold,

4.06 V at Hot

.

Fixed 10-Hour Safety Timer

.

System

.

Auto Input Source Detection D+, D– Pins

No Device Transceiver Required USB Friendly

.

Automatic Termination and Timer Disable Mode

TTDM for Absent Battery Pack With Thermistor

.

Status Indication – Charging/Done

.

Available in Small 2-mm × 2-mm or

2-mm × 3-mm Package

.

APPLICA ONS

.

Smart Phones

.

PDAs

.

MP3 Players

.

Low-Power Handheld Devices

All other trademarks are the property of their respective owners