SNVS663H June   2010  – August 2015 LMZ12003EXT

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 Ratings
    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 Enable Divider, RENT and RENB Selection
        2. 8.2.2.2 Output Voltage Selection
        3. 8.2.2.3 Soft-Start Capacitor Selection
        4. 8.2.2.4 CO Selection
        5. 8.2.2.5 CIN Selection
        6. 8.2.2.6 RON Resistor selection
          1. 8.2.2.6.1 Discontinuous Conduction and Continuous Conduction Modes Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Power Dissipation and Thermal Considerations
    4. 10.4 Power Module SMT Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Junction Temperature Range –55°C to 125°C
  • Integrated Shielded Inductor
  • Simple PCB Layout
  • Flexible Start-up Sequencing Using External Soft-Start Capacitor 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 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)
    • LMZ14203/2/1 (42-V Maximum 3 A, 2 A, 1 A)
    • LMZ12003/2/1 (20-V Maximum 3 A, 2 A, 1 A)
  • Fully WEBENCH® Power Designer Enabled
  • Electrical Specifications
    • 18-W Maximum Total Power Output
    • Up to 3-A Output Current
    • Input Voltage Range 4.5 V to 20 V
    • Output Voltage Range 0.8 V to 6 V
    • Efficiency up to 92%
  • 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 5-V and 12-V Input Rail
  • Time-Critical Projects
  • Space Constrained High Thermal Requirement Applications
  • Negative Output Voltage Applications (See AN-2027 SNVA425)

3 Description

The LMZ12003EXT 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 LMZ12003EXT is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

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 as 0.8 V. The LMZ12003EXT only requires three external resistors and four external capacitors to complete the power solution. The LMZ12003EXT 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.

Device Information(1)(2)

PART NUMBER PACKAGE BODY SIZE (NOM)
LMZ12003EXT NDW (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

LMZ12003EXT 30117501.gif

Efficiency 12-V Input at 25°C

LMZ12003EXT 30117503.gif