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1 Features

1? Integrated Shielded Inductor

? Simple PCB Layout

? Flexible Start-Up Sequencing Using External Soft-

Start and Precision Enable

? Protection Against Inrush Currents

? Input UVLO and Output Short-Circuit Protection

? –40°C to 125°C Junction Temperature Range

? Single Exposed Pad and Standard Pinout for Easy

Mounting and Manufacturing

? Low Output Voltage Ripple

? Pin-to-Pin Compatible Family:

– LMZ14203H/2H/1H (42 V Maximum, 3-A, 2-A,

1-A)

– LMZ14203/2/1 (4 2V Maximum, 3-A, 2-A, 1-A)

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

? Fully Enabled for WEBENCH? Power Designer

? Electrical Specifications

– Up to 3-A Output Current

– Input Voltage Range 6 V to 42 V

– Output Voltage as Low as 5 V

– Efficiency up to 97%

? Performance Benefits

– High Efficiency Reduces System Heat

Generation

– Low Radiated EMI (EN 55022 Class B Tested)

– No Compensation Required

– Low Package Thermal Resistance

NOTE: EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007

2 Applications

? Intermediate Bus Conversions to 12-V and 24-V

Rail

? Time-Critical Projects

? Space Constrained and High Thermal

Requirement Applications

? Negative Output Voltage Applications

3 Description

The LMZ14203H SIMPLE SWITCHER? power

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

that can drive up to 3-A load with exceptional power

conversion efficiency, line and load regulation, and

output accuracy. The LMZ14203H is available in an

innovative package that enhances thermal performance and allows for hand or machine

soldering.

The LMZ14203H can accept an input voltage rail

between 6 V and 42 V and deliver an adjustable and

highly accurate output voltage as low as 5 V. The

LMZ14203H only requires three external resistors and four external capacitors to complete the power

solution. The LMZ14203H is a reliable and robust

design with the following protection features: thermal

shutdown, input undervoltage lockout, output

overvoltage protection, short-circuit protection, output

current limit, and allows start-up into a prebiased

output. A single resistor adjusts the switching

frequency up to 1 MHz.