4054H-MS

The 4054H-MS is a 500mA single-cell Li-ion linear battery charger with input voltage tolerance up to 32V and power overvoltage protection, operating in CC/CV charging mode. It employs an internal PMOSFET architecture with integrated reverse-current protection, eliminating the need for an external blocking diode. A thermal feedback mechanism adaptively reduces charging current to limit die temperature during high-power operation or elevated ambient temperature conditions. The final float voltage is 4.2V (4.35V available upon request). Charging current is set via an external resistor. When the charging current drops to 1/10 of the programmed value after reaching the final float voltage, the device automatically terminates the charging cycle. When input power is removed, the device automatically enters a low-current state, reducing battery leakage current to below 0.1µA. Additional features include undervoltage lockout, automatic recharge, and two LED status pins for indicating charge status and end-of-charge status. The device is available in a SOT23-5 package with a bottom-side thermal pad. Suitable for USB power supplies and adapter power supplies.

Applications

• E-cigarettes
• Lithium battery charging products
• Portable devices
• Various chargers
• Bluetooth devices
• Wearable devices

Key features

• Input power port withstands up to 32V.
• Overvoltage protection activates at 6.5V input supply voltage.
• Programmable charge current up to 500mA.
• CC/CV operation with temperature-adaptive function for maximized charge rate.
• Preset charge voltage accuracy of 1±1%.
• Automatic recharge function.
• Dual charge status output with battery absent and fault indication.
• Charge termination at one-tenth of the set current.
• 2.9V trickle charging at 40% of the set current.
• Soft-start function limits inrush current.
• Reverse battery protection.
• SOT23-5 package.