1 Features

• Junction Temperature Range –55°C to 125°C
• Integrated Shielded Inductor
• Simple PCB Layout
• Flexible Start-up Sequencing Using External Soft-Start and Precision Enable
• Protection Against Inrush Currents and Faults such as Input UVLO and Output Short Circuit
• Single Exposed Pad and Standard Pinout for Easy Mounting and Manufacturing
• Fast Transient Response for Powering FPGAs and ASICs
• Low Output Voltage Ripple
• Pin-to-Pin Compatible With Family Devices:
  • LMZ14203EXT/2EXT/1EXT
    (42-V Maximum 3 A, 2 A, 1 A)
  • LMZ12003/2/1 (20-V Maximum 3 A, 2 A, 1 A)
  • LMZ14203/2/1 (42-V Maximum 3 A, 2 A, 1 A)
• Fully Enabled for WEBENCH® Power Designer
• Electrical Specifications:
  • 18-W Maximum Total Output Power
  • Up to 3-A Output Current
  • Input Voltage Range 6 V to 42 V
  • Output Voltage Range 0.8 V to 6 V
  • Efficiency up to 90%
• Performance Benefits:
  • Low Radiated Emissions and High Radiated Immunity
  • Passes vibration Standard MIL-STD-883 Method 2007.2 Condition A JESD22–B103B Condition 1
  • Passes Drop Standard MIL-STD-883 Method 2002.3 Condition B JESD22–B110 Condition B

2 Applications

• Point-of-load Conversions from 12-V and 24-V Input Rail
• Time Critical Projects
• Space Constrained and High Thermal Requirement Applications
• Negative Output Voltage Applications
  (See AN-2027 SNVA425)

3 Description

The LMZ14203EXT SIMPLE SWITCHER® power module is an easy-to-use step-down DC-DC solution capable of driving up to 3-A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LMZ14203EXT is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

The LMZ14203EXT can accept an input voltage rail between 6 V and 42 V and can deliver an adjustable and highly accurate output voltage as low as 0.8 V. The LMZ14203EXT only requires three external resistors and four external capacitors to complete the power solution. The LMZ14203EXT 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 the device allows start-up into a prebiased output. A single resistor adjusts the switching frequency up to 1 MHz.

1. For all available packages, see the orderable addendum at 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