Buck Converter for RF Power Amplifiers in 3G Devices - Fairchild Semi

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Overview

FAN5902, 800mA, 6MHz 0.4-3.4V Buck Converter for WDCMA/CDMA RFPAs with Integrated 50mohm bypass FET

The FAN5902 is a high-efficiency, low-noise, synchronous, step-down DC-to-DC converter designed for powering the radio frequency power amplifiers (RFPA) in 3G mobile handsets and other mobile applications. It provides up to 800mA of output current over an input voltage range of 2.7V to 5.5V. The output voltage can be dynamically adjusted from 0.4V up to 3.4V, proportional to an analog input voltage ranging from 0.2V to 1.7V provided by an external DAC. This allows supplying the RFPA with the voltage level that provides optimum Power Added Efficiency (PAE).

Datasheet, Application Note, & Evaluation Boards

Datasheet	Application Note
Download the short version of the FAN5902 datasheet. A detailed version of this datasheet is available upon request from your local sales office.	Download Application Note # 6088 - FAN5902 Power Management Solution for Improving the Power Efficiency of 3G W-CDMA RF Power Amplifiers

Features & Benefits

800mA RMS output current

3.1V to 4.5V Input Voltage (2.7v to 5.5Vmax)

20µs Transition Time for WCDMA standard

6MHz PWM Operation

92% Efficiency Synchronous Operation

0.5uH Inductor

50mΩ bypass FET rated for 2.5A DC Current

12-Bump (0.05mm) WLCSP

Applications

WCDMA/CDMA mobile handsets

G wireless USB & uPCI cards

Other DC/DC converters for RF applications

FAN5902, DC/DC for RFPA Video

Length: 3 minutes 25 seconds

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Product Information

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Collateral

Overview

Datasheet, Application Note, & Evaluation Boards

Features & Benefits

Applications

FAN5902, DC/DC for RFPA Video