FAN5404UCX

Battery Chargers Overview

The FAN5404UCX is a single-cell Li-Ion and Li-Polymer battery charger manufactured by Fairchild Semiconductor. It integrates a synchronous buck PWM controller with an I2C interface for programmable charge parameters. The device supports USB OTG boost operation and includes power path management to ensure system startup with a dead battery. Key electrical specifications include a maximum charge current of 1.55 A, a float voltage accuracy of ±0.5% at 25°C, and a 3 MHz switching frequency. It operates within a 6 V maximum input voltage range and features thermal regulation and shutdown capabilities.

Battery Chargers Feature Summary

• Integrates a high-efficiency synchronous buck charger with power path circuitry for seamless system operation during charging.
• Supports USB On-The-Go (OTG) boost mode to provide power to peripheral devices when connected to a host.
• Features a fully programmable I2C interface allowing control over input current, charge current, and termination settings.
• Includes safety mechanisms such as thermal regulation, shutdown, and a safety timer with reset control.

Battery Chargers Applications

• Cell phones and smart phones
• Tablets and portable media players
• PDAs and gaming devices

Battery Chargers Procurement Notes

Verify the manufacturer designation on the component marking, as Fairchild Semiconductor's semiconductor division was acquired by ON Semiconductor. Ensure the datasheet referenced corresponds to the specific revision required for your design. Confirm that the WLCSP package type matches your PCB footprint requirements before finalizing procurement.

Battery Chargers Selection Notes

Select this component for applications requiring a compact solution for single-cell lithium batteries with integrated power path management. The I2C programmability allows for customization of charge profiles to meet specific JEITA compliance or fast-charge requirements. Consider the small external inductor requirement and the 3 MHz switching frequency when designing the layout to minimize electromagnetic interference.

Battery Chargers Part Context

The FAN5404UCX belongs to the FAN5404X family of USB-compliant switch-mode chargers. This series is designed for portable consumer electronics where space efficiency and charging speed are critical. The UCX suffix typically denotes the WLCSP package variant, distinguishing it from other packaging options within the same functional family.

Battery Chargers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with alternative chargers from the same manufacturer family, ensuring pinout and electrical specifications match.

Battery Chargers FAQ

Does the FAN5404UCX support USB OTG functionality?

Yes, the device supports USB OTG boost operation, allowing it to provide power to peripheral devices when connected to a host.

How is the charge current regulated in the FAN5404UCX?

The charge current is programmable via a high-speed I2C interface, allowing for precise control over the fast-charge and termination currents.