FAN5355UC08X

Voltage Regulators - DC DC Switching Regulators Overview

The FAN5355UC08X is a synchronous step-down DC-DC converter from the TinyBuck family, manufactured by Fairchild Semiconductor. It delivers up to 1A output current with a fixed 0.8V output voltage. The device operates within a 2.7V to 5.5V input range and features a 3MHz switching frequency. Packaged in a compact 12-bump CSP (WLCSP), it supports I2C-compatible digital programming for voltage adjustment. Key electrical parameters include a minimum on-time of 35ns, load regulation of -0.1%/A, and an operating temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous rectification architecture ensures high efficiency across varying load conditions.
• Digital programmability via I2C interface allows precise voltage control and system optimization.
• Integrated PFM mode at light loads minimizes quiescent current consumption.
• Smooth transition between PWM and PFM modes prevents audible noise.

Voltage Regulators - DC DC Switching Regulators Applications

• SmartReflex-compliant power supply systems
• Split supply DSPs and microprocessor solutions
• Cell phones, smart phones, and PDAs
• Portable media players and digital cameras

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and REACH material declarations prior to integration. Check for specific package markings and lot codes to ensure traceability. Validate that the received units match the exact part number suffixes to avoid functional discrepancies due to minor manufacturing variations.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this model when a fixed 0.8V rail is required for low-power processors. The 3MHz frequency enables the use of small inductors, reducing overall board space. Ensure the application does not require shutdown functionality, as this variant lacks that feature. Verify that the 1A current limit meets the peak demand of the target load without exceeding thermal constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the FAN5355 series of digitally programmable regulators. It shares architectural similarities with the FAN53555 but offers lower current capacity (1A vs 5A) and higher switching frequency (3MHz vs 2.4MHz). The series is designed for portable electronics requiring efficient, compact power management solutions with minimal external component count.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consider checking for updated revisions from the manufacturer or equivalent devices from other vendors if obsolescence is a concern.