LP3947 - USB/AC 适配器，单节锂离子电池充电器 IC

LP3947是TI德州仪器公司的一款电池充电器IC产品，LP3947是USB/AC 适配器，单节锂离子电池充电器 IC，本站介绍了LP3947的封装应用图解、特点和优点、功能等，并给出了与LP3947相关的TI元器件型号供参考。

LP3947 - USB/AC 适配器，单节锂离子电池充电器 IC - 电池充电器IC - 电池管理产品 - 德州仪器

产品描述

The LP3947 is a complete charge management system that safely charges and maintains a Li-Ion battery from either USB power source or AC adaptor. In USB mode, the LP3947 supports charging in low power or high power mode. Alternatively, the LP3947 can take charge from AC adaptor. In both USB and AC adaptor modes, charge current, battery regulation voltage, and End of Charge (EOC) point can be selected via I2C interface. The LP3947 can also operate on default values that are pre-programmed in the factory. The battery temperature is monitored continuously at the Ts pin to safeguard against hazardous charging conditions. The charger also has under-voltage and over-voltage protection as well as an internal 5.6 hr timer to protect the battery. The pass transistor and charge current sensing resistor are all integrated inside the LP3947.

The LP3947 operates in four modes: pre-qualification, constant current, constant voltage and maintenance modes. There are two open drain outputs for status indication. An internal amplifier readily converts the charge current into a voltage. Also, the charger can operate in an LDO mode providing a maximum of 1.2 Amp to the load.

产品特性

Supports USB Charging Scheme
Integrated Pass Transistor
Near-Depleted Battery Preconditioning
Monitors Battery Temperature
Built-In 5.6 Hour Timer
Under Voltage and Over Voltage Lockout
Charge Status Indicators
Charge Current Monitor Analog Output
LDO Mode Operation can source 1 Amp
Continuous Over Current/Temperature Protection

Key Specifications

1% Charger Voltage Accuracy Over 0°C ≤ TJ ≤ 85°C
4.3V to 6V Input Voltage Range
100 mA to 750 mA Charge Current Range, in Charger Mode
100 mA to 500 mA Charge Current Range, in USB Mode
WSON Package Power Dissipation: 2.7W at TA = 25°C

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