FAN53555BUC09X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555BUC09X is a synchronous step-down switching voltage regulator from onsemi's TinyBuck series. It operates with an input voltage range of 2.5 V to 5.5 V and delivers a programmable output voltage between 0.603 V and 1.41 V. The device supports a maximum output current of 3 A at a fixed switching frequency of 2.4 MHz. It utilizes a 20-WLCSP package (1.96x1.56 mm) for surface mount installation. The component functions within a temperature range of -40°C to +85°C and features digital programming via an I2C interface.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Digitally programmable output voltage controlled through an I2C interface
• Synchronous rectification architecture for high efficiency
• Compact WLCSP-20 footprint suitable for space-constrained designs

Voltage Regulators - DC DC Switching Regulators Applications

• Portable computing systems
• Cloud systems and edge computing hardware
• Digital set-top boxes

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix BUC09X against the manufacturer datasheet to confirm the exact output voltage range and pinout configuration. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Check for obsolescence notices or PCN documentation regarding manufacturing changes. Ensure the ordering quantity matches the reel packaging specifications provided by the supplier.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact, digitally adjustable power solution is required for low-voltage logic cores. The 3 A current capability suits moderate load applications. Verify that the system design can accommodate the 2.4 MHz switching frequency noise profile. Ensure the PCB layout supports the small WLCSP-20 thermal requirements for reliable operation under full load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the FAN53555 family of TinyBuck regulators designed for portable electronics. It replaces older linear regulators to improve efficiency in battery-powered devices. The series integrates control circuitry and power switches into a minimal footprint, reducing external component count compared to discrete solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.