50

55

60

65

70

75

80

85

90

95

100

0

0.5

1

1.5

2

2.5

3

0.8

1.2

1.5

1.8

2.5

3.3

5.0

25°C

OUTPUT CURRENT (A)

Enable

LMZ12003EXT

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LMZ12003EXT

SNVS663H – JUNE 2010 – REVISED AUGUST 2015

for Demanding Environments and Rugged Applications

1 Features

2 Applications

1

•

Junction Temperature Range –55°C to 125°C

•

Point-of-load Conversions from 5-V and 12-V

Input Rail

•

Integrated Shielded Inductor

•

Time-Critical Projects

•

Simple PCB Layout

•

Space Constrained High Thermal Requirement

•

Flexible Start-up Sequencing Using External Soft-

Applications

Start Capacitor and Precision Enable

•

Negative Output Voltage Applications (See AN-

•

Protection Against Inrush Currents and Faults

2027 SNVA425)

such as Input UVLO and Output Short Circuit

•

Single Exposed Pad and Standard Pinout for Easy

3 Description

Mounting and Manufacturing

•

Fast Transient Response for FPGAs and ASICs

module is an easy-to-use step-down DC-DC solution

•

Low Output Voltage Ripple

capable of driving up to 3-A load with exceptional

power conversion efficiency, line and load regulation,

•

Pin-to-Pin Compatible With Family Devices:

and output accuracy. The LMZ12003EXT is available

–

LMZ14203EXT/2EXT/1EXT

in an innovative package that enhances thermal

(42-V Maximum 3 A, 2 A, 1 A)

performance

and

allows

for

hand

or

machine

–

LMZ14203/2/1 (42-V Maximum 3 A, 2 A, 1 A)

soldering.

–

LMZ12003/2/1 (20-V Maximum 3 A, 2 A, 1 A)

The LMZ12003EXT can accept an input voltage rail

•

between 4.5 V and 20 V and can deliver an

adjustable and highly accurate output voltage as low

•

Electrical Specifications

as 0.8 V. The LMZ12003EXT only requires three

–

18-W Maximum Total Power Output

external resistors and four external capacitors to

–

Up to 3-A Output Current

complete the power solution. The LMZ12003EXT is a

reliable

and

robust

design

with

the

following

–

Input Voltage Range 4.5 V to 20 V

protection

features:

thermal

shutdown,

input

–

Output Voltage Range 0.8 V to 6 V

undervoltage lockout, output overvoltage protection,

–

Efficiency up to 92%

short circuit protection, output current limit, and the

•

Performance Benefits

device allows start-up into a prebiased output. A

single resistor adjusts the switching frequency up to 1

–

Low Radiated Emissions and High Radiated

MHz.

Immunity

–

Passes Vibration Standard MIL-STD-883

Device Information(1)(2)

Method 2007.2 Condition A JESD22–B103B

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Condition 1

LMZ12003EXT

NDW (7)

10.16 mm × 9.85 mm

–

Passes Drop Standard MIL-STD-883 Method

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

2002.3 Condition B JESD22–B110 Condition B

the end of the data sheet.

(2) Peak reflow temperature equals 245°C. See SNAA214 for

more details.

Simplified Application Schematic

Efficiency 12-V Input at 25°C

1

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.