FAN5909UCX

Special Purpose Regulators Overview

The FAN5909UCX is a high-efficiency DC-DC buck converter designed for RF power amplifier applications in 3G, 3.5G, and 4G mobile devices. It features an input voltage range of 2.7V to 5.5V and provides a programmable output voltage from 0.4V to 3.6V with a single output capable of delivering up to 3A. The device operates at a switching frequency of 3.2MHz and is housed in a compact 16-WLCSP package measuring 1.71x1.71mm. It functions within a temperature range of -40°C to 85°C.

Special Purpose Regulators Feature Summary

• Optimized for low noise and high efficiency in RF power amplifier supply rails
• Compact WLCSP packaging suitable for space-constrained mobile designs
• Programmable output voltage allows flexibility for various PA bias requirements

Special Purpose Regulators Applications

• RF Power Amplifier (PA) supply for 3G/3.5G mobile handsets
• RF Power Amplifier (PA) supply for 4G LTE mobile handsets
• General purpose step-down conversion in portable electronic devices

Special Purpose Regulators Procurement Notes

Verify the manufacturer source carefully, as Fairchild Semiconductor has been integrated into onsemi. Ensure the part number suffix matches the specific revision required for your design. Check RoHS compliance status and moisture sensitivity level (MSL 1) during storage and handling. Confirm availability through authorized distributors to avoid counterfeit components.

Special Purpose Regulators Selection Notes

Select this component when driving RF PAs requiring up to 3A current with strict size constraints. The 3.2MHz switching frequency balances EMI performance with passive component size. Ensure the input voltage range aligns with the system battery profile. Consider thermal dissipation capabilities within the small WLCSP footprint for high-duty cycle applications.

Special Purpose Regulators Part Context

This part belongs to the FAN5909 family of PMICs focused on RF PA power management. It complements other regulators in the portfolio by offering higher current capability than smaller variants while maintaining a minimal footprint. It serves as a critical power source for linear amplifiers in cellular communication modules.