LTC3307A

1

Rev. A

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

5V, 3A Synchronous Step-Down

Silent Switcher in 2mm x 2mm LQFN

The LTC®3307A is a very small, high efficiency, low noise,

monolithic synchronous 3A step-down DC/DC converter

operating from a 2.25V to 5.5V input supply. Using con-

stant frequency, peak current mode control at switching

frequencies up to 3MHz and minimum on-time as low as

22ns, this regulator achieves fast transient response with

small external components. Silent Switcher architecture

minimizes EMI emissions.

The LTC3307A operates in forced continuous or pulse

skip mode for low noise, or low-ripple Burst Mode opera-

tion for high efficiency at light loads, ideal for battery-

powered systems. The IC regulates output voltages as

low as 500mV. Other features include output overvoltage

protection, short-circuit protection, thermal shutdown,

clock synchronization, and up to 100% duty cycle opera-

tion for low dropout. The device is available in a low pro-

file 12-lead 2mm × 2mm × 0.74mm LQFN package with

exposed pad for low thermal resistance.

High Efficiency, 2MHz, 1.2V 3A Step-Down Converter

Efficiency and Power Loss

in Burst Mode Operation

APPLICATIONS

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High Efficiency: 8mΩ NMOS, 31mΩ PMOS

n

Programmable Frequency to 3MHz

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Tiny Inductor and Capacitors

n

Peak Current Mode Control

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22ns Minimum On-Time

n

Wide Bandwidth, Fast Transient Response

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Silent Switcher™ Architecture

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Ultralow EMI Emissions

n

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Safely Tolerates Inductor Saturation in Overload

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n

n

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Precision 400mV Enable Threshold

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Shutdown Current: 1µA

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Power Good, Internal Compensation and Soft Start

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Thermally Enhanced 2mm × 2mm LQFN Package

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AEC-Q100 Qualified for Automotive Applications

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Optical Networking, Servers, Telecom

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Automotive, Industrial, Communications

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Distributed DC Power Systems (POL)

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FPGA, ASIC, µP Core Supplies

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Features

Applications

Typical Application

Description

Absolute Maximum Ratings

Order Information

Pin Configuration

Electrical Characteristics

Typical Performance Characteristics

Pin Functions

Block Diagram

Operation

Applications Information

Typical Applications

Package Description

Revision History

Typical Application

Related Parts

1µF

0201

3307A TA01a

EN

SW

SW

PGND

140k

10pF

4.7µF

4.7µF

470nH

100k

15µF

x2

1.2V

3A

FB

AGND

PGOOD

LTC3307A

1µF

0201

MODE/SYNC

RT

10nF

EFFICIENCY

POWER LOSS

Murata DFE201210S–R47M

LOAD CURRENT (A)

0.001

0.01

0.1

1

3

0

10

20

30

40

50

60

70

80

90

100

0.0001

0.001

0.01

0.1

1

10

in Burst Mode Operation

Efficiency and Power Loss

3307A TA01b