FAN5308 Fairchild Semiconductor, FAN5308 Datasheet

FAN5308

Manufacturer Part Number

FAN5308

Description

800mA High-Efficiency Step-Down DC-DC Converter

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5308.pdf (11 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5308MPX

Manufacturer:

FAIRCHILD/仙童

Quantity:

20 000

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FAN5308 Rev. 1.0.1

FAN5308

800mA High-Efﬁciency Step-Down DC-DC Converter

Features

■ 96% Efﬁciency, Synchronous Operation

■ Adjustable Output Voltage Options from 0.8V to V

■ 2.5V to 5.5V Input Voltage Range

■ Up to 800mA Output Current

■ Fixed Frequency 1.3MHz PWM Operation

■ High Efﬁciency Power Save Mode

■ 100% Duty Cycle Low Dropout Operation

■ Soft Start

■ Output Over-Voltage Protection

■ Dynamic Output Voltage Positioning

■ 25µA Quiescent Current

■ Thermal Shutdown and Short Circuit Protection

■ Pb-Free 3x3mm 6-Lead MLP Package

Applications

■ Pocket PCs, PDAs

■ Cell Phones

■ Battery-Powered Portable Devices

■ Digital Cameras

■ Hard Disk Drives

■ Set-Top-Boxes

■ Point-of-Load Power

■ Notebook Computers

■ Communications Equipment

Typical Application

10µF

PGND

Figure 1. Typical Application

(AGND)

3.3µH

Description

Designed for use in battery-powered applications, the FAN5308

is a high-efﬁciency, low-noise synchronous PWM current mode

and Pulse Skip (Power Save) mode DC-DC converter. It can

provide up to 800mA of output current over a wide input range

from 2.5V to 5.5V. The output voltage can be externally adjusted

over a wide range of 0.8V to 5.5V by means of an external volt-

age divider.

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 dur-

ing load transients. At higher loads the system automatically

switches over to current mode PWM control, operating at 1.3

MHz. A current mode control loop with fast transient response

ensures excellent line and load regulation. To achieve high efﬁ-

ciency and ensure long battery life, the quiescent current is

reduced to 25µA in Power Save mode, and the supply current

drops below 1µA in shut-down mode. The FAN5308 is available

in a 3x3mm 6-lead MLP package.

10KΩ

5KΩ

2 x 10µF

OUT

1.2V (800mA)

OUT

www.fairchildsemi.com

April 2005

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