FAN53600AUC28X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53600AUC28X is a fixed-output synchronous buck regulator from Fairchild Semiconductor, now part of onsemi. It operates with an input voltage range of 2.5 V to 5.5 V and provides a fixed 2.8 V output at up to 600 mA. The device features a 3 MHz switching frequency and integrates synchronous rectification for improved efficiency. Packaged in a compact 6-ball WLCSP (0.86 x 1.16 mm), it supports surface-mount installation. Operating temperatures range from -40 °C to +85 °C, with a typical quiescent current of 1 µA.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous step-down topology for high efficiency
• Fixed 2.8 V output configuration
• Compact 6-ball WLCSP footprint
• Low standby current consumption

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics power management
• Battery-powered mobile devices
• Embedded systems requiring stable low-voltage rails
• IoT sensor nodes and wearables

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation carefully, as Fairchild Semiconductor products are now managed by onsemi. Confirm that the 'AUC28X' suffix corresponds to the specific 2.8 V fixed output variant. Ensure the package type matches the required 6-ball WLCSP form factor for PCB layout compatibility. Check for any updated ordering codes due to corporate integration changes.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 2.8 V rail is needed from a single-cell lithium battery or similar 2.5–5.5 V source. The 600 mA current limit suits moderate-load applications. The 3 MHz frequency allows for smaller external passive components compared to lower-frequency regulators. Consider thermal performance within the small WLCSP package under continuous load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the FAN53600/FAN53610 family of synchronous buck regulators. The FAN53600 series offers 600 mA output capability, while the FAN53610 provides 1 A. Both share similar architectures but differ in current handling and sometimes pinout configurations. The FAN53600AUC28X specifically denotes the 600 mA version with a fixed 2.8 V output in WLCSP packaging.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other parts from the same FAN53600 family with compatible output voltages, such as FAN53600AUC33X for 3.3 V. Cross-reference with onsemi’s current portfolio for equivalent functionality. Verify pin-to-pin compatibility if replacing in existing designs.