FB

GND

SW

CB

SHDN

LM2840/1/2-ADJL

VOUT

VIN

L1

D1

R1

R2

VIN

CBOOT

CIN

COUT

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Design

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2840-Q1, LM2841-Q1, LM2842-Q1

SNVSBE5 – APRIL 2019

LM284x-Q1 Automotive SIMPLE SWITCHER® 4.5-V to 42-V Input, 0.1-, 0.3-, or

0.6-A Output Step-Down DC/DC Regulator in Thin SOT

1

1 Features

1

•

AEC-Q100-qualified for automotive applications:

–

Temperature grade 1: –40°C to +125°C, TA

•

Input voltage 4.5 V to 42 V

•

Output current options of 100 mA, 300 mA, and

600 mA

•

Feedback pin voltage of 0.765 V

•

550-kHz (X) or 1.25-MHz (Y) switching frequency

•

Low shutdown IQ: 16-µA typical

•

Short-circuit protected

•

Internally compensated

•

Soft-start circuitry

•

Small overall solution size (SOT-6L package)

•

Create a custom design using the LM2840-Q1 (or

LM2841-Q1/42-Q1) with the WEBENCH® Power

Designer

2 Applications

•

Automotive ADAS camera

•

Automotive wireless charging

•

Automotive body control and lighting

3 Description

The LM284x-Q1 SIMPLE SWITCHER™ devices are

PWM DC/DC buck (step-down) regulators. With an

input range from 4.5 V to 42 V, they are suitable for a

wide

range

of

applications,

such

as

power

conditioning from unregulated sources. They feature

a low RDSON (0.9‑Ω typical) internal switch for

maximum

efficiency

(85%

typical).

Operating

frequency is fixed at 550 kHz (X option) and

1.25 MHz (Y option), allowing the use of small

external components while still being able to have low

output voltage ripple. Soft start can be implemented

using the shutdown (SHDN) pin with an external RC

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

a specific application.

The LM2840-Q1 is optimized for up to 100 mA, the

LM2841-Q1 for up to 300 mA, and the LM2842-Q1

for up to 600

‑mA load currents. They all have a

0.765-V nominal feedback voltage.

Additional features include: thermal shutdown, VIN

undervoltage lockout, and gate-drive undervoltage

lockout. The LM284x-Q1 are available in a low-profile

SOT-6L package.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2840-Q1, LM2841-Q1,

LM2842-Q1

SOT (6)

1.60 mm × 2.90 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit