LM3103

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SNVS523F – SEPTEMBER 2007 – REVISED APRIL 2013

LM3103 SIMPLE SWITCHER® Synchronous 1MHz 0.75A

Step-Down Voltage Regulator

Check for Samples: LM3103

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FEATURES

KEY SPECIFICATIONS

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•

Low Component Count and Small Solution

•

Input Voltage Range 4.5 V to 42 V

Size

•

0.75 A Output Current

•

Stable with Ceramic and Other Low ESR

•

0.6V, ±2% Reference

Capacitors

•

Integrated Dual N-Channel Main and

•

No Loop Compensation Required

Synchronous MOSFETs

•

High Efficiency at a Light Load by DCM

•

Thermally Enhanced HTSSOP-16 Package

Operation

•

Pre-bias Startup

DESCRIPTION

The LM3103 Synchronously Rectified Buck Converter

•

Ultra-Fast Transient Response

features all required functions to implement a highly

•

Programmable Soft-Start

efficient and cost effective buck regulator. It is

•

Programmable Switching Frequency up to 1

capable of supplying 0.75A to loads with an output

MHz

voltage as low as 0.6V. Dual N-Channel synchronous

MOSFET switches allow a low component count, thus

•

Valley Current Limit

reducing complexity and minimizing board size.

•

Thermal Shutdown

Different from most other COT regulators, the

•

Output Over-Voltage Protection

LM3103 does not rely on output capacitor ESR for

•

Precision Internal Reference for an Adjustable

stability, and is designed to work exceptionally well

Output Voltage Down to 0.6V

with

ceramic

and

other

very

low

ESR

output

capacitors. It requires no loop compensation, results

TYPICAL APPLICATIONS

in a fast load transient response and simple circuit

implementation. The operating frequency remains

•

5VDC, 12VDC, 24VDC, 12VAC, and 24VAC

nearly constant with line variations due to the inverse

Systems

relationship between the input voltage and the on-

•

Embedded Systems

time. The operating frequency can be externally

•

Industrial Control

programmed up to 1 MHz. Protection features include

•

Automotive Telematics and Body Electronics

protection, thermal shutdown, and gate drive under-

•

Point of Load Regulators

voltage lock-out. The LM3103 is available in the

•

Storage Systems

thermally enhanced HTSSOP-16 package.

•

Broadband Infrastructure

•

Direct Conversion from 2/3/4 Cell Lithium

Batteries Systems

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.