LM2670

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SNVS036J – APRIL 2000 – REVISED APRIL 2013

Check for Samples: LM2670

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FEATURES

DESCRIPTION

The LM2670 series of regulators are monolithic

2

•

Efficiency Up to 94%

integrated circuits which provide all of the active

•

Simple and Easy to Design with (Using Off-

functions for a step-down (buck) switching regulator

The-Shelf External Components)

capable of driving up to 3A loads with excellent line

•

150 m

Ω DMOS Output Switch

and load regulation characteristics. High efficiency

(>90%) is obtained through the use of a low ON-

•

3.3V, 5V and 12V Fixed Output and Adjustable

resistance DMOS power switch. The series consists

(1.2V to 37V) Versions

of fixed output voltages of 3.3V, 5V and 12V output

•

50

μA Standby Current When Switched OFF

version.

•

±2% Maximum Output Tolerance Over Full

The SIMPLE SWITCHER concept provides for a

Line and Load Conditions

complete design using a minimum number of external

•

Wide Input Voltage Range: 8V to 40V

components. The switching clock frequency can be

provided by an internal fixed frequency oscillator

•

External Sync Clock Capability (280kHz to

(260KHz) or from an externally provided clock in the

400kHz)

range of 280 kHz to 400 kHz which allows the use of

•

260 kHz Fixed Frequency Internal Oscillator

physically smaller sized components. A family of

•

−40 to +125°C Operating Junction Temperature

standard inductors for use with the LM2670 are

Range

available from several manufacturers to greatly

simplify the design process. The external Sync clock

provides direct and precise control of the output ripple

APPLICATIONS

frequency

for

consistent

filtering

or

frequency

•

Simple to Design, High Efficiency (>90%) Step-

spectrum positioning.

Down Switching Regulators

The

LM2670

series

also

has

built

in

thermal

•

Efficient System Pre-Regulator for Linear

shutdown, current limiting and an ON/OFF control

Voltage Regulators

input that can power down the regulator to a low

•

Battery Chargers

50

μA quiescent current standby condition. The output

voltage is ensured to a ±2% tolerance.

•

Communications and Radio Equipment

Regulator with Synchronized Clock Frequency

Typical Application

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

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

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SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, 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.