LM3102

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SNVS515G – SEPTEMBER 2007 – REVISED JANUARY 2012

LM3102/LM3102Q SIMPLE SWITCHER Synchronous 1MHz 2.5A

Step-Down Voltage Regulator

Check for Samples: LM3102

1

FEATURES

•

Output over-voltage protection

•

Precision internal reference for an adjustable

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•

LM3102Q is an automotive grade product that

output voltage down to 0.8V

is AEC-Q100 grade 1 qualified (-40°C to +125°C

operating junction temperature)

•

Thermal shutdown

•

Low component count and small solution size

TYPICAL APPLICATIONS

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Stable with ceramic and other low ESR

capacitors

•

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

systems

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No loop compensation required

•

Embedded Systems

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High efficiency at a light load by DCM

operation

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Industrial Control

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Pre-bias startup

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Automotive Telematics and Body Electronics

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Ultra-fast transient response

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Point of Load Regulators

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Programmable soft-start

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Storage Systems

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Programmable switching frequency up to 1

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Broadband Infrastructure

MHz

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Direct Conversion from 2/3/4 Cell Lithium

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Valley current limit

Batteries Systems

DESCRIPTION

The LM3102 Synchronously Rectified Buck Converter features all required functions to implement a highly

efficient and cost effective buck regulator. It is capable of supplying 2.5A to loads with an output voltage as low

as 0.8V. Dual N-Channel synchronous MOSFET switches allow a low component count, thus reducing

complexity and minimizing board size.

Different from most other COT regulators, the LM3102 does not rely on output capacitor ESR for stability, and is

designed to work exceptionally well with ceramic and other very low ESR output capacitors. It requires no loop

compensation, results in a fast load transient response and simple circuit implementation. The operating

frequency remains nearly constant with line variations due to the inverse relationship between the input voltage

and the on-time. The operating frequency can be externally programmed up to 1 MHz. Protection features

voltage lock-out. The LM3102 is available in the thermally enhanced eTSSOP-20 package as well as a uSMD

low profile chip-scale package with reduced output current.

Table 1. Key Specifications

VALUE

UNIT

Input voltage range 4.5V-42V

2.5A output current

0.8V, ±1.5% reference

Integrated dual N-Channel main and synchronous MOSFETs

Thermally enhanced eTSSOP-20 package

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2012, 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.