Output Current (A)

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

50

60

70

80

90

100

Eff_

8V

12V

24V

V

IN

VIN

EN

BOOT

SW

FB

AGND

V

OUT

C

BOOT

L1

C

IN

C

OUT

R

FBT

R

FBB

VCC

PG

PGND

C

VCC

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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.

LM60440, LM60430

SNVSBN5A – FEBRUARY 2020 – REVISED JUNE 2020

LM604x0 3.8-V to 36-V, 3-A, and 4-A Ultra-Small Synchronous Step-Down Converter

1

1 Features

1

•

Functional Safety-Capable

–

Documentation available to aid functional

safety system design

•

Low EMI and switching noise

–

Meets CISPR22 class 5 standard

–

Enhanced QFN package minimizes parasitic

inductance and switch node ringing

•

Configured for rugged industrial applications

–

Standard QFN footprint: single large thermal

pad and all pins accessible from perimeter

–

Pin compatible variants:

–

LM60440 (36 V, 4 A)

–

LM60430 (36 V, 3 A)

–

Junction temperature range –40°C to +150°C

–

Frequency: 400 kHz, 1 MHz

–

Output voltage range: 1 V to 24 V

•

High efficiency power conversion at all loads

–

Peak efficiency > 95%

–

–

Low operating quiescent current of 25 µA

•

Create a custom design using the LM60440 with

the WEBENCH® Power Designer

2 Applications

•

Industrial PC and CPU (PLC controller)

•

Servo drive and AC drive control module

•

Medical and instrumentation applications

3 Description

The

LM604x0

regulator

is

an

easy-to-use,

synchronous,

step-down

DC/DC

converter

that

delivers best-in-class efficiency for rugged industrial

applications. The LM60430 drives up to 3-A of load

current, and the LM60440 is industry's smallest 4A

step-down converter.

The LM604x0 is available in an ultra-miniature WQFN

package with wettable flanks and a standard QFN

pin-out with a thermal pad to enhance thermal

performance. This enhanced QFN package features

extremely small parasitic inductance and resistance,

enabling very high efficiency while minimizing switch

node ringing and dramatically reducing EMI.

The LM604x0 uses peak-current-mode control to

automatically fold back frequency at light load to

ensure exceptional efficiency across the entire load

range. The low power dissipation paired with a

thermally optimized QFN package enables a power

dense solution size. In addition the device requires

few external components and has a pinout designed

for simple PCB layout. The small solution size and

feature set of the LM604x0 are designed to simplify

implementation for a wide range of end equipment.

This device is also available in an AEC-Q100-

qualified version.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM60440

WQFN-13

3.00 mm × 2.00 mm

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

the end of the data sheet.

space

space

Simplified Schematic

Efficiency versus Output Current