SNVSB51C September   2018  – December 2025 LM5164-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Control Architecture
      2. 6.3.2  Internal VCC Regulator and Bootstrap Capacitor
      3. 6.3.3  Regulation Comparator
      4. 6.3.4  Internal Soft Start
      5. 6.3.5  On-Time Generator
      6. 6.3.6  Current Limit
      7. 6.3.7  N-Channel Buck Switch and Driver
      8. 6.3.8  Synchronous Rectifier
      9. 6.3.9  Enable/Undervoltage Lockout (EN/UVLO)
      10. 6.3.10 Power Good (PGOOD)
      11. 6.3.11 Thermal Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
      2. 6.4.2 Active Mode
      3. 6.4.3 Sleep Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 Switching Frequency (RRON)
        3. 7.2.2.3 Buck Inductor (LO)
        4. 7.2.2.4 Output Capacitor (COUT)
        5. 7.2.2.5 Input Capacitor (CIN)
        6. 7.2.2.6 Type-3 Ripple Network
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Compact PCB Layout for EMI Reduction
        2. 7.4.1.2 Feedback Resistors
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Development Support
        1. 8.1.2.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

7.2.1 Design Requirements

The target full-load efficiency is 92% based on a nominal input voltage of 48V and an output voltage of 12V. The required input voltage range is 15V to 100V. The LM5164-Q1 delivers a fixed 12V output voltage. The switching frequency is set by resistor RRON at 300kHz. The output voltage soft-start time is 3ms. Table 7-1 lists the required components. See also the LM5164-Q1 EVM User's Guide.

Table 7-1 List of Components
COUNT REF DES VALUE DESCRIPTION PART NUMBER MANUFACTURER
2CIN2.2µFCapacitor, Ceramic, 2.2µF, 100V, X7R, 10%CGA6N3X7R2A225K230ABTDK
2COUT22µFCapacitor, Ceramic, 22µF, 25V, X7R, 10%TMK325B7226KMHTTaiyo Yuden
1CA3300pFCapacitor, Ceramic, 3300pF, 16V, X7R, 10%CGA3E2X7R2A332K080AATDK
1CB56pFCapacitor, Ceramic, 56pF, 50V, X7R, 10%C0603C560J5GACTUKemet
1CBST2.2nFCapacitor, Ceramic, 2200pF, 50V, X7R, 10%GCM155R71H222KA37DMuRata
1LO68µHInductor, 68µH, 170mΩ, > 1.8 AMSS1246T-683MLBCoilcraft
1RRON100kΩResistor, Chip, 100k, 1%, 0.1 W, 0603RG1608P-1053-B-T5Susumu Co Ltd
1RFB1453kΩResistor, Chip, 453k, 1%, 0.1 W, 0603RT0603BRD07448KLYageo
1RFB249.9kΩResistor, Chip, 49.9k, 1%, 0.1 W, 0603RG1608P-4992-B-T5Susumu Co Ltd
1RA453kΩResistor, Chip, 453k, 1%, 0.1W, 0603RT0603BRD07453KLYageo
1U1Wide VIN synchronous buck converterLM5164QDDARQ1TI