SNVSCL2A December   2024  – August 2025 LM51770 , LM517701

PRODUCTION DATA  

1.   1
2. 1 Features
3. 2 Applications
4. 3 Description
5. 4 Device Comparison
6. 5 Pin Configuration and Functions
7. 6 Specifications
   1. 6.1 Absolute Maximum Ratings
   2. 6.2 Handling Ratings
   3. 6.3 Recommended Operating Conditions
   4. 6.4 Thermal Information
   5. 6.5 Electrical Characteristics
   6. 6.6 Timing Requirements
   7. 6.7 Typical Characteristics
8. 7 Parameter Measurement Information
   1. 7.1 Gate Driver Rise Time and Fall Time
   2. 7.2 Gate Driver Dead (Transition) Time
9. 8 Detailed Description
   1. 8.1 Overview
   2. 8.2 Functional Block Diagram
   3. 8.3 Feature Description
      1. 8.3.1  Power-On Reset (POR System)
      2. 8.3.2  Buck-Boost Control Scheme
         1. 8.3.2.1 Boost Mode
         2. 8.3.2.2 Buck Mode
         3. 8.3.2.3 Buck-Boost Mode
      3. 8.3.3  Power Save Mode
      4. 8.3.4  Supply Voltage Selection – VMAX Switch
      5. 8.3.5  Enable and Undervoltage Lockout
      6. 8.3.6  Oscillator Frequency Selection
      7. 8.3.7  Frequency Synchronization
      8. 8.3.8  Voltage Regulation Loop
      9. 8.3.9  Output Voltage Tracking
      10. 8.3.10 Slope Compensation
      11. 8.3.11 Configurable Soft Start
      12. 8.3.12 Peak Current Sensor
      13. 8.3.13 Current Monitoring and Current Limit Control Loop
      14. 8.3.14 Short Circuit - Hiccup Protection
      15. 8.3.15 nFLT Pin and Protections
      16. 8.3.16 Device Configuration Pin
      17. 8.3.17 Dual Random Spread Spectrum – DRSS
      18. 8.3.18 Gate Driver
   4. 8.4 Device Functional Modes
10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
       1. 9.2.1 Design Requirements
       2. 9.2.2 Detailed Design Procedure
          1. 9.2.2.1  Custom Design with WEBENCH Tools
          2. 9.2.2.2  Frequency
          3. 9.2.2.3  Feedback Divider
          4. 9.2.2.4  Inductor and Current Sense Resistor Selection
          5. 9.2.2.5  Slope Compensation
          6. 9.2.2.6  Output Capacitor
          7. 9.2.2.7  Input Capacitor
          8. 9.2.2.8  UVLO Divider
          9. 9.2.2.9  Soft-Start Capacitor
          10. 9.2.2.10 MOSFETs QH1 and QL1
          11. 9.2.2.11 MOSFETs QH2 and QL2
          12. 9.2.2.12 Output Voltage Frequency Compensation
          13. 9.2.2.13 External Component Selection
       3. 9.2.3 Application Curves
    3. 9.3 System Examples
       1. 9.3.1 Bi-Directional Power Backup
       2. 9.3.2 Parallel (Multiphase) Operation
       3. 9.3.3 External Gate Driver with Logic Level High Side Gate Signals
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
       1. 9.5.1 Layout Guidelines
          1. 9.5.1.1 Power Stage Layout
          2. 9.5.1.2 Gate Driver Layout
          3. 9.5.1.3 Controller Layout
       2. 9.5.2 Layout Example
11. 10Device and Documentation Support
    1. 10.1 Device Support
       1. 10.1.1 Third-Party Products Disclaimer
       2. 10.1.2 Development Support
          1. 10.1.2.1 Custom Design with WEBENCH Tools
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
12. 11Revision History
13. 12Mechanical, Packaging, and Orderable Information
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LM51770x 78V Wide V_IN Bidirectional 4-Switch Buck-Boost Controller