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FAN5353

3 MHz, 3 A Synchronous Buck Regulator

ON Semiconductor 

December 2013

FAN5353

3 MHz, 3 A Synchronous Buck Regulator

Features

 3 MHz Fixed-Frequency Operation

 Best-in-Class Load Transient

 3 A Output Current Capability

 2.7 V to 5.5 V Input Voltage Range

 Adjustable Output Voltage: 0.8 V to 90% of VIN

 Power Good Output

 Internal Soft-Start

 Input Under-Voltage Lockout (UVLO)

 Thermal Shutdown and Overload Protection

 12-Lead, 3 x 3.5 mm MLP

Applications

 Set-Top Box

 Hard Disk Drive

 Communications Cards

 DSP Power

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.

R2 AGND

R1

COUT

FB 1

VOUT 2

PGND 3

PGND 4

SW 5

SW 6

P1

(GND)

12

11 PGOOD

10 EN

9 VCC

8 PVIN

7 PVIN

CIN1

CVCC

CIN

Figure 1. Typical Application

Ordering Information

Part Number

FAN5353MPX

Temp. Range

-40 to 85°C

Package

MLP-12, 3 x 3.5 mm

Packing Method

Tape and Reel

© 2009 Fairchild Semiconductor Corporation

FAN5353 • Rev. 1.0.3

www.fairchildsemi.com

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