FAN54120UC420X

Battery Chargers Overview

The FAN54120UC420X is a single-cell linear battery charger designed for USB-compatible applications. It supports lithium-ion and lithium-polymer batteries with a 500mA charge current and a 4.2V float voltage. The device operates within an input voltage range of 2.5V to 4.5V and features power back capability for small battery and IoT applications. It is housed in a WLCSP-20 package, suitable for surface mount installation, and functions across a temperature range of -40°C to +85°C.

Battery Chargers Feature Summary

• Integrates power back capability to allow system operation from the battery when the primary source is unavailable.
• Provides USB-compatible charging profiles for simplified integration into portable devices.
• Includes comprehensive protection mechanisms against over-temperature, over-voltage, and short circuit conditions.

Battery Chargers Applications

• Small battery powered IoT devices
• USB-powered portable electronics
• Single-cell lithium-ion or lithium-polymer battery management systems

Battery Chargers Procurement Notes

Verify component status as this part number is listed as obsolete and no longer manufactured by onsemi. Confirm availability of parametric equivalents such as the FAN54120UC425X if replacement is required. Ensure all technical specifications match the new component before finalizing procurement decisions.

Battery Chargers Selection Notes

Select this component for designs requiring a compact solution for single-cell Li-Ion or Li-Po batteries. The integrated power back feature is critical for applications needing seamless power source switching. Ensure the PCB layout accommodates the WLCSP-20 package dimensions and thermal requirements for reliable operation.

Battery Chargers Part Context

This component belongs to the FAN54120 series of battery chargers from onsemi. It is categorized under Battery Management ICs within the Power Management (PMIC) family. The device is specifically engineered for low-cost, space-constrained applications where USB compatibility and power back functionality are essential design parameters.

Battery Chargers Replacement Considerations

The FAN54120UC425X is identified as a parametric equivalent substitute. Verify pinout compatibility and electrical characteristics before substitution. No other official substitutes are confirmed in public documentation.