FAN53555UC04X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN53555UC04X is a digitally programmable synchronous buck regulator from onsemi's TinyBuck series. It accepts an input voltage range of 2.5 V to 5.5 V and delivers up to 5 A output current. The device operates at a fixed switching frequency of 2.4 MHz, enabling the use of small external components such as 330 nH inductors and 20 µF capacitors. It provides a programmable output voltage range of 600 mV to 1.3875 V with a typical quiescent current of 55 µA. Packaged in a compact WLCSP-20 (1.6x2 mm) format, it supports operation across a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Digitally programmable output voltage via I2C interface for flexible system design
• Synchronous rectification architecture maintains high efficiency at light loads down to 10 mA
• High-frequency 2.4 MHz switching allows for minimal external passive component footprint
• Compact WLCSP-20 package optimizes board space utilization

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management
• Embedded systems with strict size constraints
• Battery-powered devices needing extended runtime through high efficiency
• Digital signal processing circuits requiring stable programmable voltage rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix UC04X against official onsemi documentation to confirm the exact output voltage configuration and pinout compatibility. Ensure that the procurement source provides valid RoHS compliance certificates and material declarations. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Confirm that the supply chain supports the required packaging quantities and handling standards for WLCSP devices.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator when a compact solution is needed for converting 2.5 V to 5.5 V inputs into precise lower voltages. It is suitable for applications where digital control of the output voltage is preferred over resistive dividers. Consider the 5 A current capability and 2.4 MHz frequency for balancing size and performance. Evaluate thermal requirements based on the load current and ambient temperature conditions within the specified operating range.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the TinyBuck family of synchronous buck regulators designed by onsemi. The series focuses on providing high efficiency and small form factors for portable applications. The FAN53555 variant specifically targets higher current demands compared to earlier generations while maintaining the digitally programmable feature set. It represents a transition toward more integrated power solutions in mobile and embedded markets.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for direct substitutes like FAN53555UC01X or FAN53555UC05X if different fixed or programmable voltage ranges are acceptable. Verify pin-to-pin compatibility and electrical parameter alignment before substitution.