AiP4054 – Single-Cell Lithium Battery Linear Charger IC

The AiP4054 is a compact and highly integrated linear charger IC designed for single-cell lithium-ion battery applications. Utilizing a constant-current/constant-voltage (CC/CV) charging algorithm, it features an internal PMOSFET and eliminates the need for external sense resistors or blocking diodes, simplifying circuit design and reducing overall cost. The charging voltage is preset to 4.2V, and the charging current can be easily set up to 500mA via an external resistor. Once the battery voltage reaches 4.2V and the charging current drops to 1/10 of the set value, the AiP4054 automatically terminates charging and enters standby mode with a supply current below 100μA. When the input power is removed, the device enters a low-power sleep mode with battery leakage current less than 1μA. The AiP4054 also integrates undervoltage lockout, automatic recharge, and charge status indication.

Key Features

• Linear charger IC for single-cell lithium-ion batteries

• CC/CV charging algorithm with trickle charge for deeply discharged cells

• Preset battery float voltage: 4.2V ±1%

• Programmable charge current up to 500mA via external resistor

• Charging current termination at C/10

• Charge status indication via open-drain output

• Integrated thermal regulation and over-temperature protection

• Low supply current in standby mode (<100μA)

• Ultra-low battery leakage in sleep mode (<1μA)

• Automatic recharge function

• Compact SOT23-5 package

• Operating temperature range: –40°C to +85°C

Applications

• Power banks

• Bluetooth speakers and wireless headsets

• Wearable devices

• Portable measurement tools

• USB-powered electronics