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.