FAN5307MP18X View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

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FAN5307MP18X

High-Efficiency Step-Down DC-DC Converter

Fairchild Semiconductor 

January 2006

FAN5307

High-Efficiency Step-Down DC-DC Converter

Features

■ 95% Efficiency, Synchronous Operation

■ Adjustable Output Voltage Option from 0.7V to VIN

■ 2.5V to 5.5V Input Voltage Range

■ Customized Fixed Output Voltage Options

■ Up to 300mA Output Current

■ Fixed Frequency 1MHz PWM Operation

■ High Efficiency Power Save Mode

■ 100% Duty Cycle Low Dropout Operation

■ Soft Start

■ Dynamic Output Voltage Positioning

■ 15µA Quiescent Current

■ Excellent Load Transient Response

■ 5-Lead SOT-23 Package

■ 6-Lead MLP 3x3mm Package

Applications

■ Pocket PCs, PDAs

■ Cell Phones

■ Battery-Powered Portable Devices

■ Digital Cameras

■ Low Power DSP Supplies

General Description

The FAN5307, a high efficiency low noise synchronous

PWM current mode and Pulse Skip (Power Save) mode

DC-DC converter is designed for battery-powered appli-

cations. It provides up to 300mA of output current over a

wide input range from 2.5V to 5.5V. The output voltage

can be either internally fixed or externally adjustable over

a wide range of 0.7V to 5.5V VIN by an external voltage

divider. Custom output voltages are also available. Con-

tact a Fairchild sales representative for customized out-

put voltage options.

At moderate and light loads pulse skipping modulation is

used. Dynamic voltage positioning is applied, and the

output voltage is shifted 0.8% above nominal value for

increased headroom during load transients. At higher

loads the system automatically switches to current mode

PWM control, operating at 1 MHz. A current mode con-

trol loop with fast transient response ensures excellent

line and load regulation. In Power Save mode, the quies-

cent current is reduced to 15µA in order to achieve high

efficiency and to ensure long battery life. In shut-down

mode, the supply current drops below 1µA. The device is

available in 5-lead SOT-23 and 6-lead MLP 3x3mm

packages.

Typical Application

100

95

90

85

80

75

70

65

0.01

EFFICIENCY vs. LOAD CURRENT

VOUT = 1.8V

VIN=2.5V

VIN=3.6V

VIN=5.5V

0.1

1

10

100

Load Current [mA]

1000

©2005 Fairchild Semiconductor Corporation

1

FAN5307 Rev. 1.0.4

www.fairchildsemi.com

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