FAN53555UC03X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC03X is a synchronous step-down DC-DC converter from the TinyBuck series, manufactured by onsemi. It provides a programmable output voltage ranging from 0.6 V to 1.23 V with a maximum continuous output current of 5 A. The device operates within an input voltage range of 2.5 V to 5.5 V and utilizes a fixed switching frequency of 2.4 MHz. It is housed in a 20-WLCSP package measuring 1.96 mm by 1.56 mm. The component supports negative temperature coefficient operation for load line adjustment.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates high-side and low-side power MOSFETs with a synchronous rectification architecture for high efficiency.
• Features digitally programmable output voltage via I2C-compatible interface for dynamic voltage scaling.
• Includes built-in soft-start circuitry to limit inrush current during startup sequences.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable computing devices such as netbooks and ultra-mobile PCs
• Smartphones and mobile communication modules
• Embedded systems requiring stable core voltage for processors

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity through authorized distribution channels due to end-of-life status. Confirm RoHS compliance and REACH declaration requirements for specific manufacturing regions. Validate package marking codes against official datasheets to prevent counterfeit substitution. Ensure storage conditions meet moisture sensitivity level specifications prior to reflow soldering.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for high-current applications. The WLCSP footprint minimizes board space compared to traditional packages. Verify that the target application supports I2C configuration for optimal voltage tuning. Consider thermal dissipation capabilities given the 5 A output capability in a small form factor.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the FAN5355 family of TinyBuck regulators designed for portable electronics. It succeeds earlier generations by offering higher current density and improved transient response. The device is optimized for applications demanding high efficiency and minimal external component count.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The FAN53555BUC79X is listed as a parameter-equivalent replacement option available from onsemi. Verify pinout compatibility and electrical specifications before substituting.