December 2013

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5353 • Rev. 1.0.3

FAN5353

3 MHz, 3 A Synchronous Buck Regulator

Features

IN

Applications

Description

The FAN5353 is a step-down switching voltage regulator that

delivers an adjustable output from an input voltage supply of

2.7 V to 5.5 V. Using a proprietary architecture with

synchronous rectification, the FAN5353 is capable of

delivering 3 A at over 85% efficiency. The regulator operates

at a nominal fixed frequency of 3 MHz, which reduces the

value of the external components to 470 nH for the output

inductor and 10 µF for the output capacitor. Additional output

capacitance can be added without affecting stability if tighter

regulation during transients is required. The regulator

includes an open-drain power good (PGOOD) signal that

pulls low when the output is not in regulation.

In shutdown mode, the supply current drops below 1 µA,

reducing power consumption.

FAN5353 is available in a 12-lead 3x3.5 mm MLP package.

Figure 1. Typical Application

Ordering Information

Part Number

Temp. Range

Package

Packing Method

FAN5353MPX

-40 to 85°C

MLP-12, 3 x 3.5 mm

Tape and Reel

PVIN

PVIN

VCC

EN

VOUT

FB

R2

PGND

PGND

SW

SW

C

OUT

C

IN1

R1

AGND

PGOOD

C

VCC

6

5

4

3

2

1

7

8

9

10

11

12

P1

(GND)

C

IN