FB

GND

SW

CB

SHDN

LM2840/1/2-ADJL

VOUT

VIN

L1

D1

R1

R2

LM2841, LM2842

www.ti.com

SNVS540H – MARCH 2009 – REVISED APRIL 2013

LM2840/LM2841/LM2842/ LM2840-Q1/LM2841-Q1/LM2842-Q1 100/300/600 mA 42V Input

Step-Down DC/DC Regulator in Thin SOT

Check for Samples: LM2841, LM2842

1

FEATURES

DESCRIPTION

The LM2840, LM2841 and LM2842 are PWM DC/DC

2

•

LM2840Q, LM2841-Q1 and LM2842-Q1 are

buck (step-down) regulators. With a wide input range

Automotive Grade Products that are AEC-Q100

from 4.5V-42V, they are suitable for a wide range of

Grade 1 Qualified (-40°C to +125°C Operating

applications

such

as

power

conditioning

from

Junction Temperature)

•

Input Voltage Range of 4.5V to 42V

typical) internal switch for maximum efficiency (85%

typical). Operating frequency is fixed at 550 kHz (X

•

Output Current Options of 100 mA, 300 mA

version) and 1.25 MHz (Y version) allowing the use of

and 600 mA

small external components while still being able to

•

Feedback Pin Voltage of 0.765V

have low output voltage ripple. Soft-start can be

•

550 kHz (X) or 1.25 MHz (Y) Switching

implemented using the shutdown pin with an external

Frequency

RC circuit allowing the user to tailor the soft-start time

to a specific application.

•

The LM2840 is optimized for up to 100 mA, the

•

Short Circuit Protected

LM2841 for 300 mA and the LM2842 is optimized for

•

Internally Compensated

up to 600 mA load currents. They all have a 0.765V

•

Soft-Start Circuitry

nominal feedback voltage.

•

Small Overall Solution Size (SOT-6L Package)

under-voltage lockout, and gate drive under-voltage

APPLICATIONS

lockout. The LM2840, LM2841 and LM2842 are

available in a low profile SOT-6L package.

•

Battery Powered Equipment

•

Industrial Distributed Power Applications

•

Portable Media Players

•

Portable Hand Held Instruments

Typical Application Circuit

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, 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.