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LV3842 4-V to 36-V, 600-mA, Synchronous Step-Down Converter

1 Features

•New product available:

–LMR54406 4-V to 45-V, 0.6-A, 1.1-MHz

synchronous buck converter

•For faster time to market:

–TPSM365R6 3-V to 65-V, 0.6-A, 200-kHz to

2.2-MHz power module

•Configured for rugged industrial applications

–4-V to 36-V input voltage range supporting 40-V

absolute maximum rating

–600-mA continuous output current

–70-ns minimum switching-on time

–98% maximum duty cycle

–PFM and Forced PWM (FPWM) options

–1.1-MHz switching frequency

–Support start-up with pre-biased output

–Short-circuit protection with hiccup mode

–±0.5% tolerance voltage reference at 25°C

junction temperature

–Precision enable

–Overtemperature protection

•Small solution size and ease of use

–Integrated synchronous rectification

–Internal compensation for ease of use

–SOT-23-6 package

2 Applications

•Electricity meter

•Smart meter data collector, concentrator

•Power Line Communication (PLC) module

•General purpose wide V

IN

power supplies

3 Description

The LV3842 is an easy to use synchronous step-down

DC-DC converter capable of driving up to 600-mA

load current. With a wide input range of 4 V to

36 V, the device is designed for a wide range of

industrial applications for power conditioning from an

unregulated source.

The LV3842 employs 1.1-MHz switching frequency

for small solution size. The LV3842 also has FPWM

(forced PWM) version to achieve constant frequency

and small output voltage ripple over the full load

range. Soft-start and compensation circuits are

employed internally which allows the device to be

used with minimum external components.

The device has built-in protection features, such

as cycle-by-cycle current limit, hiccup mode short-

circuit protection, and thermal shutdown in case of

excessive power dissipation. The LV3842 is available

in SOT-23-6 package.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LV3842DBV (SOT-23, 6)2.90 mm × 2.80 mm

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

the end of the data sheet.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

CB

SW

L

C

BOOT

FB

VIN

V

IN

up to 36 V

C

OUT

EN

C

IN

GND

V

OUT

R

FBT

R

FBB

Typical Application Schematic

I

OUT

(A)

Efficiency (%)

00.10.20.30.40.50.6

0

10

20

30

40

50

60

70

80

90

100

D003

V

IN

= 15 V

V

IN

= 24 V

V

IN

= 36 V

Efficiency vs Output Current V

OUT

= 12 V, 1.1 MHz,

FPWM

LV3842

SLUSDA9C – MAY 2018 – REVISED AUGUST 2023

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.

Produktspecifikationer