FAN53555BUC23X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555BUC23X is a digitally programmable synchronous buck switching regulator manufactured by Fairchild Semiconductor, now part of onsemi. It operates within an input voltage range of 2.5 V to 5.5 V and delivers up to 5 A of output current. The device features a fixed switching frequency of 2.4 MHz and supports an adjustable output voltage range from 600 mV to 1.3875 V. Packaged in a compact 20-WLCSP (1.96x1.56 mm) format, it is designed for space-constrained applications requiring high efficiency and precise voltage regulation across temperatures from -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Digitally programmable output voltage via I2C interface for flexible system configuration
• Integrated synchronous rectification with high-efficiency PWM control
• Compact WLCSP package optimized for dense PCB layouts

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring low profile power solutions
• Embedded systems needing precise digital voltage adjustment
• Mobile devices utilizing single-cell lithium-ion battery inputs

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer status as Fairchild Semiconductor was acquired by onsemi. Confirm that the specific suffix indicates the correct output voltage setting and packaging variant. Check for obsolescence notices or lifecycle changes associated with the legacy Fairchild product line before finalizing procurement plans.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 2.4 MHz switching frequency and specific programmable voltage window are required. Ensure the application demands a 5 A continuous load capability within the 2.5 V to 5.5 V input range. Verify that the WLCSP-20 footprint aligns with the target PCB design constraints and thermal management requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the TinyBuck family of highly integrated DC-DC converters. It represents the transition period between Fairchild Semiconductor branding and onsemi manufacturing standards. The device is engineered for portable applications where size and efficiency are critical, serving as a direct replacement for older non-programmable buck regulators in similar form factors.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for onsemi equivalents such as FAN53555 variants with different voltage suffixes if the specific 1.3875 V max limit is insufficient. Verify pin-to-pin compatibility with alternative WLCSP packages from other manufacturers if supply chain issues arise.