May 2008

© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN2103 Rev. 1.0.5

FAN2103 — TinyBuck™

3A, 24V Input, Integrated Synchronous Buck Regulator

Features

3A Output Current

Over 95% Efficiency

Fully Synchronous Operation with Integrated

Schottky Diode on Low-side MOSFET Boosts

Efficiency

Programmable Frequency Operation (200KHz to

600KHz)

Power-good Signal

Accepts Ceramic Capacitors on Output

External Compensation for Flexible Design

Wide Input Range: 3V to 24V

Input Under-voltage Lockout

Programmable Over-current Limit

Under-voltage, Over-voltage, and

Thermal Protections

5x6mm, 25-pin, 3-pad MLP

Applications

Graphics Cards

Battery-powered Equipment

Set-top Boxes

Point-of-load Regulation

Servers

Description

The FAN2103 TinyBuck™ is an easy-to-use, cost- and

space-efficient, 3A synchronous buck solution. It

enables designers to solve high current requirements in

a small area with minimal external components.

External

compensation,

programmable

switching

frequency, and current limit features allow for design

optimization and flexibility.

The summing current mode modulator uses lossless

current sensing for current feedback and over-current,

and includes voltage feedforward.

Fairchild’s

advanced

BiCMOS

power

process,

thermally efficient MLP package provide the ability to

dissipate high power in a small package.

Output

over-voltage,

under-voltage,

and

thermal

shutdown protections plus power-good, help protect the

devices from damage during fault conditions.

Related Application Notes

AN-5067 – PCB Land Pattern Design and Surface

Mount Guidelines for MLP Packages

Ordering Information

Part Number

Operating

Temperature Range

Package

Eco Status

Packing

Method

FAN2103MPX

-10°C to 85°C

25-Pin Molded Leadless Package

(MLP) 5x6mm

Green

Tape and Reel

FAN2103EMPX

-40°C to 85°C

25-Pin Molded Leadless Package

(MLP) 5x6mm

Green

Tape and Reel

For Fairchild’s definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.