SNVS632S December   2009  – July 2017 LMZ14203

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 COT Control Circuit Overview
      2. 7.3.2 Output Overvoltage Comparator
      3. 7.3.3 Current Limit
      4. 7.3.4 Thermal Protection
      5. 7.3.5 Zero Coil Current Detection
      6. 7.3.6 Prebiased Start-Up
    4. 7.4 Device Functional Modes
      1. 7.4.1 Discontinuous Conduction and Continuous Conduction Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Design Steps for the LMZ14203 Application
          1. 8.2.2.2.1 Enable Divider, RENT and RENB Selection
          2. 8.2.2.2.2 Output Voltage Selection
          3. 8.2.2.2.3 Soft-Start Capacitor Selection
          4. 8.2.2.2.4 CO Selection
          5. 8.2.2.2.5 CIN Selection
          6. 8.2.2.2.6 Discontinuous Conduction and Continuous Conduction Mode Selection
          7. 8.2.2.2.7 RON Resistor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation and Board Thermal Requirements
    4. 10.4 Power Module SMT Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Custom Design With WEBENCH® Tools
    2. 11.2 Device Support
      1. 11.2.1 Development Support
      2. 11.2.2 Third-Party Products Disclaimer
    3. 11.3 Documentation Support
      1. 11.3.1 Related Documentation
    4. 11.4 Receiving Notification of Documentation Updates
    5. 11.5 Community Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 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
  • –40°C to 125°C Junction Temperature Range
  • 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 Family:
    • LMZ1420x (42 V Maximum 3 A, 2 A, 1 A)
    • LMZ1200x (20 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
    • Operates at High Ambient Temperature With No Thermal Derating
    • High Efficiency Reduces System Heat Generation
    • Low Radiated Emissions (Electromagnetic Interference [EMI]) Tested With EN55022 Class B Standard
    • Passes 10-V/m Radiated Immunity EMI Test Standard EN61000 4-3
  • Create a Custom Design Using the LMZ14203 With the WEBENCH® Power Designer

2 Applications

  • Point of Load Conversions From 12-V and 24-V Input Rail
  • Space Constrained and High Thermal Requirement Applications
  • Negative Output Voltage Applications
    (See AN-2027 SNVA425)

3 Description

The LMZ14203 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 LMZ14203 is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

The LMZ14203 can accept an input voltage rail between 6 V and 42 V and deliver an adjustable and highly accurate output voltage as low as 0.8 V. The LMZ14203 only requires three external resistors and four external capacitors to complete the power solution. The LMZ14203 is a reliable and robust design with the following protection features: thermal shutdown, input UVLO, 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.

Device Information(1)(2)

PART NUMBER PACKAGE BODY SIZE (NOM)
LMZ14203 TO-PMOD (7) 10.16 mm × 9.85 mm
  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

LMZ14203 LMZ14203.gif

Efficiency 12-V Input at 25°C

LMZ14203 30107003.gif