LM27341, LM27342, LM27341-Q1, LM27342-Q1

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SNVS497E – NOVEMBER 2008 – REVISED APRIL 2013

LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down

DC-DC Regulator with Frequency Synchronization

Check for Samples: LM27341, LM27342, LM27341-Q1, LM27342-Q1

1

FEATURES

DESCRIPTION

The

LM27341

and

LM27342

regulators

are

2

•

Space Saving 3 x 3 mm 10-Pin SON and

monolithic, high frequency, PWM step-down DC-DC

MSOP-PowerPad Packages

converters

in

10-pin

SON

and

10-pin

MSOP-

•

Wide Input Voltage Range: 3V to 20V

PowerPad packages. They contain all the active

•

Wide Output Voltage Range: 1V to 18V

functions to provide local DC-DC conversion with fast

transient response and accurate regulation in the

•

LM27341 Delivers 1.5A Maximum Output

smallest possible PCB area.

Current

With

a

minimum

of

external

components

the

•

LM27342 Delivers 2A Maximum Output Current

LM27341 and LM27342 are easy to use. The ability

•

High Switching Frequency: 2 MHz

to drive 1.5A or 2A loads respectively, with an internal

•

150 m

Ω NMOS switch results in the best power

2.35 MHz

density available. The world-class control circuitry

allows for on-times as low as 65 ns, thus supporting

•

150 m

Ω NMOS Switch with Internal Bootstrap

exceptionally high frequency conversion. Switching

Supply

frequency

is

internally

set

to

2

MHz

and

•

70 nA Shutdown Current

synchronizable from 1 to 2.35 MHz, which allows the

•

Internal Voltage Reference Accuracy of 1%

use of extremely small surface mount inductors and

chip capacitors. Even though the operating frequency

•

Peak Current-Mode, PWM Operation

is very high, efficiencies up to 90% are easy to

•

Thermal Shutdown

achieve. External shutdown is included featuring an

•

LM27341-Q1 and LM27342-Q1 are AEC-Q100

ultra-low shutdown current of 70 nA. The LM27341

Grade 1 Qualified and are Manufactured on an

and LM27342 utilize peak current-mode control and

Automotive Grade Flow

internal compensation to provide high-performance

regulation over a wide range of operating conditions.

Additional features include internal soft-start circuitry

APPLICATIONS

to reduce inrush current, pulse-by-pulse current limit,

•

Local 12V to Vcore Step-Down Converters

thermal

shutdown,

and

output

over-voltage

•

Radio Power Supply

protection.

•

Core Power in HDDs

•

Set-Top Boxes

•

Automotive

•

USB Powered Devices

•

DSL Modems

1

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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 © 2008–2013, 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.