LP3947ISD-09

• Support USB charging plan
• Transistors are integrated inside
• Precharge the near-depleted battery
• Monitor battery temperature
• Built-in 5.6-hour timer
• Undervoltage and overvoltage lockout
• Charging status indicator
• Charge current monitor output analog
• Operation in LDO mode can output 1 amp
• Continuous overcurrent/overtemperature protection

illustrate

While the LP3947 chip is a complete charging management system, security fee and maintenance of lithium-ion batteries regardless of whether from USB or AC power adapters. In USB mode, the LP3947 chip also supports charging in low or high power mode. In addition, the LP3947 chip can also be charged from an AC adapter. In both modes of USB and AC adapters, the charging current, the regulated voltage of the battery, and the charging (EOC) end point can be selected via the I2C interface. The LP3947 chip can also be operated by default at the factory pre-programmed value. The TS foot for battery temperature monitoring is constantly preventing harmful charging conditions. The charger also has undervoltage and overvoltage protection and an internal 5.6-hour timer to protect the battery. Both the transistor and the charge current sensing resistor are integrated into the LP3947 chip inside.

The LP3947 chip also has four operating modes: prequalification, constant current, constant voltage and maintenance mode. There are two states that indicate the open-drain output. The internal amplifier easily converts into a voltage of charge current. In addition, the charger can provide a maximum load of 1.2 amps in one LDO mode.

Key specifications:

• 1％的充电器电压精度在0 ° C J
• 4.3V to 6.0V input voltage range
• 100 mA to 750 mAh charge current range, charging mode
• Charging current range from 100mA to 500mA, in USB mode
• LLP package power consumption: 2.7W at T A = 25°C

apply

• Cellular phones
• handheld computer
• Digital camera
• USB-powered devices
• Programmable current source