SNVS708G March   2011  – August 2015 LMZ23608

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 Synchronization Input
      2. 7.3.2 Current Sharing
      3. 7.3.3 Output Overvoltage Protection
      4. 7.3.4 Current Limit
      5. 7.3.5 Thermal Protection
      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 Design Steps
        2. 8.2.2.2 Enable Divider, RENT, RENB and RENH Selection
        3. 8.2.2.3 Output Voltage Selection
        4. 8.2.2.4 Soft-Start Capacitor Selection
        5. 8.2.2.5 Tracking Supply Divider Option
        6. 8.2.2.6 COUT Selection
        7. 8.2.2.7 CIN Selection
        8. 8.2.2.8 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

  • Integrated Shielded Inductor
  • Simple PCB Layout
  • Frequency Synchronization Input (350 kHz to 600 kHz)
  • Current Sharing Capability
  • Flexible Start-up Sequencing Using External Soft-Start, Tracking and Precision Enable
  • Protection Against Inrush Currents and Faults Such as Input UVLO and Output Short Circuit
  • Junction Temperature Range –40°C to 125°C
  • Single Exposed Pad and Standard Pinout for Easy Mounting and Manufacturing
  • Fully Enabled for WEBENCH® Power Designer
  • Pin Compatible With LMZ22010/08, LMZ12010/08, LMZ23610/06H, and LMZ13610/08/06H
  • Electrical Specifications
    • 40-W Maximum Total Output Power
    • Up to 8-A Output Current
    • Input Voltage Range 6 V to 36 V
    • Output Voltage Range 0.8 V to 6 V
    • Efficiency up to 92%
  • Performance Benefits
    • High Efficiency Reduces System Heat Generation
    • Low Radiated Emissions (EMI) Tested to EN55022 Class B Standard
    • Only 7 External Components
    • Low Output Voltage Ripple
    • No External Heat Sink Required
    • Simple Current Sharing for Higher Current Applications
EN 55022:2006, +A1:2007, FCC Part 15 Subpart B, tested on Evaluation Board with EMI configuration

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 LMZ23608 SIMPLE SWITCHER® power module is an easy-to-use step-down DC-DC solution capable of driving up to 8-A load. The LMZ23608 is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

The LMZ23608 can accept an input voltage rail between 6 V and 36 V and can deliver an adjustable and highly accurate output voltage as low as 0.8 V. The LMZ23608 only requires two external resistors and three external capacitors to complete the power solution.

The LMZ23608 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. The sync input allows synchronization over the 350 to 600-kHz switching frequency range.

Device Information(1)(2)

PART NUMBER PACKAGE BODY SIZE (NOM)
LMZ23608 NDY (11) 15.00 mm × 15.00 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

LMZ23608 23608_SSch.gif

Efficiency 3.3-V Output at 25°C

LMZ23608 30151236.gif