FAN48623UC315X

Overview

The FAN48623UC315X is a programmable synchronous boost switching regulator manufactured by Fairchild Semiconductor. It operates with an input voltage range of 2.7V to 5.5V and delivers up to 2.5A output current. The device integrates a 2.3MHz fixed-frequency PWM controller, enabling compact designs using small inductors and capacitors. Key electrical parameters include a quiescent current of 95µA and a shutdown current of less than 1µA. It features adjustable soft-start, cycle-by-cycle current limiting, and thermal shutdown protection. The component is housed in a 16-WLCSP package measuring 2x2mm.

Feature Summary

• Integrates a synchronous power stage for high efficiency without external MOSFETs
• Supports programmable output voltage via external resistor divider
• Includes comprehensive protection mechanisms such as thermal shutdown and overcurrent limiting

Applications

• Portable consumer electronics requiring efficient step-up conversion
• Battery-powered devices needing extended runtime through low quiescent current
• Embedded systems utilizing single-cell lithium-ion or alkaline battery sources

Procurement Notes

Verify the manufacturer origin, as Fairchild Semiconductor's semiconductor division was acquired by onsemi. Ensure the specific part number matches the required suffix for packaging and temperature grade. Confirm RoHS compliance status through official datasheets before procurement. Cross-reference ordering information with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a compact solution is required for boosting low-voltage inputs to higher rails. The integrated synchronous rectifier reduces board space compared to asynchronous alternatives. Consider the 2.3MHz switching frequency for balancing component size against electromagnetic interference. Evaluate the 2.5A current limit against peak load requirements to ensure adequate headroom.

Part Context

This device belongs to the FAN4862 series of TinyBoost regulators designed for space-constrained applications. It shares architectural similarities with other members like the FAN48619 but differs in maximum output current and specific pin configurations. The series targets portable markets where efficiency and footprint are critical design constraints.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific Fairchild variant are not available in the provided documentation. Designers should consult official replacement guides or contact the manufacturer directly for qualified alternatives.