FAN5904 Fairchild Semiconductor, FAN5904 Datasheet

FAN5904

Manufacturer Part Number

FAN5904

Description

The FAN5904 is a high-efficiency, low-noise, synchronous, step-down, DC-DC converter optimized for powering Radio Frequency (RF) Power Amplifiers (PAs) in handsets and other mobile applications

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5904.pdf (3 pages)

Available stocks

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Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5904BUC01X

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FAIRCHILD/仙童

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5904UC01X

Manufacturer:

FAIRCHILD/仙童

Quantity:

20 000

Company:

H&T Electronics

Part Number:

FAN5904UC01X

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FAN5904 • Rev. 3.0.5

FAN5904

Multi-Mode Buck Converter for GSM/EDGE, 3G/3.5G and 4G PAs

Features



Applications



Ordering Information

FAN5904UC00X

FAN5904UC01X

Part Number

2.7V to 5.5V Input Voltage Range

Single 470nH Small Form Factor Inductor

35mΩ Integrated Bypass FET

100% Duty Cycle for Low Dropout Operation

Input Under-Voltage Lockout / Thermal Shutdown

1.71mm x 1.71mm, 16-Bump, 0.40mm Pitch WLCSP

High Power PWM Mode

Low Power Auto Mode

Bypass Mode

Dynamic Supply Bias for Polar or Linear GSM/EDGE

PAs and 3G/3.5G and 4G PAs

Dynamic Supply Bias for GSM/EDGE Quad Band

Amplifiers for Mobile Handsets and Data Cards

OUT

Up to 3A Load Current

Up to 95% Efficient Synchronous Operation in

High P

Output current up to 2.3A

10µs Output Voltage Step Response for Early

GSM Tx Power-Loop Settling

3MHz PWM Mode

Up to 95% Efficient Synchronous Operation at

Higher P

Output Current up to 1.2A

10µs Output Voltage Step Response for Early Tx

Power-Loop Settling

6MHz PWM Operation at High Power and PFM

Operation at Low Power

Range from 0.40V to 3.50V (or V

OUT

Conditions

LPM Mode PFM Output Voltage

Conditions

All V

OUT

< 1V

OUT

0.4V to PVIN

)

Temperature

-40°C to +85°C

Range

Description

The FAN5904 is a high-efficiency, low-noise, synchronous,

step-down, DC-DC converter optimized for powering Radio

Frequency (RF) Power Amplifiers (PAs) in handsets and

other mobile applications. In High-Power Mode, GSM Tx

power is enabled. In Low-Power Mode, up to 3.0W is

supported, enabling up to 29dBm output power for 3G/3.5G

and 4G platforms.

The output voltage may be dynamically adjusted from 0.40V

to 3.50V, proportional to an analog input voltage VCON

ranging from 0.16V to 1.40V, optimizing power-added

efficiency. Fast transition times of less than 10µs are

achieved, allowing excellent inter-slot settling.

An integrated bypass FET is automatically enabled when

the battery voltage and voltage drop across the DC-DC

PMOS device are within a set voltage range of the desired

output voltage (V

bypass feature enables the FAN5904 to support heavy load

currents under the most stringent VSWR conditions while

maintaining

performance. The bypass FET may also be enabled by

providing a VCON voltage nominally greater than or equal

to 1.5V or by driving BPEN high.

The FAN5904 operates in PWM Mode with a 6MHz

switching frequency in Low-Power Mode and at 3MHz in

High-Power Mode, which limits high-frequency spur levels.

It uses a single, small form factor inductor of 470nH. In

addition, PFM operation is allowed in Low-Power Mode to

improve efficiency at low load currents.

The FAN5904UC00X option allows PFM Mode only when

PFM Mode at higher voltages for applications that can

tolerate larger output ripple and that demand optimal low-to-

moderate load current efficiency.

OUT

is less than 1V, while the FAN5904UC01X permits

1.71mm x 1.71mm, 16-Bump

0.4mm Pitch, Wafer-Level

Chip-Scale Package (WLCSP)

high

OUT

= V

efficiency

Package

BAT

- V

PMOS

and

- V

BP_TH

superior

December 2011

www.fairchildsemi.com

). This dynamic

Tape and Reel

Packing

spectral

Related parts for FAN5904

FAN5904 Summary of contents

Page 1

... DC-DC PMOS device are within a set voltage range of the desired output voltage (V bypass feature enables the FAN5904 to support heavy load currents under the most stringent VSWR conditions while maintaining performance. The bypass FET may also be enabled by providing a VCON voltage nominally greater than or equal to 1 ...

Page 2

... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ © 2011 Fairchild Semiconductor Corporation FAN5904 • Rev. 3.0 ...

Page 3

... Fairchild Semiconductor Corporation FAN5904 • Rev. 3.0.5 23 www.fairchildsemi.com ...

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