SNVSB51B September   2018  – April 2024 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

7.2.1 Design Requirements

The target full-load efficiency is 92% based on a nominal input voltage of 48 V and an output voltage of 12 V. The required input voltage range is 15 V to 100 V. The LM5164-Q1 delivers a fixed 12-V output voltage. The switching frequency is set by resistor RRON at 300 kHz. The output voltage soft-start time is 3 ms. Table 7-1 lists the required components. Refer to the LM5164-Q1EVM-041 User's Guide for more detail.

Table 7-1 List of Components
COUNT REF DES VALUE DESCRIPTION PART NUMBER MANUFACTURER
2CIN2.2 µFCapacitor, Ceramic, 2.2 µF, 100 V, X7R, 10%CGA6N3X7R2A225K230ABTDK
2COUT22 µFCapacitor, Ceramic, 22 µF, 25 V, X7R, 10%TMK325B7226KMHTTaiyo Yuden
1CA3300 pFCapacitor, Ceramic, 3300 pF, 16 V, X7R, 10%CGA3E2X7R2A332K080AATDK
1CB56 pFCapacitor, Ceramic, 56 pF, 50 V, X7R, 10%C0603C560J5GACTUKemet
1CBST2.2 nFCapacitor, Ceramic, 2200 pF, 50 V, X7R, 10%GCM155R71H222KA37DMuRata
1LO68 µHInductor, 68 µH, 170 mΩ, > 1.8 AMSS1246T-683MLBCoilcraft
1RRON100 kΩResistor, Chip, 100 k, 1%, 0.1 W, 0603RG1608P-1053-B-T5Susumu Co Ltd
1RFB1453 kΩResistor, Chip, 453 k, 1%, 0.1 W, 0603RT0603BRD07448KLYageo
1RFB249.9 kΩResistor, Chip, 49.9 k, 1%, 0.1 W, 0603RG1608P-4992-B-T5Susumu Co Ltd
1RA453 kΩResistor, Chip, 453 k, 1%, 0.1W, 0603RT0603BRD07453KLYageo
1U1Wide VIN synchronous buck converterLM5164QDDARQ1TI