SNVSCL2 December   2024 LM51770

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 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 Detailed Design Procedure
        1. 9.2.1.1  Custom Design with WEBENCH Tools
        2. 9.2.1.2  Frequency
        3. 9.2.1.3  Feedback Divider
        4. 9.2.1.4  Inductor and Current Sense Resistor Selection
        5. 9.2.1.5  Slope Compensation
        6. 9.2.1.6  Output Capacitor
        7. 9.2.1.7  Input Capacitor
        8. 9.2.1.8  UVLO Divider
        9. 9.2.1.9  Soft-Start Capacitor
        10. 9.2.1.10 MOSFETs QH1 and QL1
        11. 9.2.1.11 MOSFETs QH2 and QL2
        12. 9.2.1.12 Frequency Compensation
        13. 9.2.1.13 External Component Selection
      2. 9.2.2 Application Curves
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Power Stage Layout
      2. 11.1.2 Gate Driver Layout
      3. 11.1.3 Controller Layout
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
        1. 12.1.2.1 Custom Design with WEBENCH Tools
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  14. 13Revision History
  15. 14Mechanical, Packaging, and Orderable Information
    1.     80

Package Options

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

9.2.1.13 External Component Selection

Table 9-2 Components Example for Typical Application
ReferenceDescriptionPart Number
RCOMP1.91kΩ
CCOMP147nF, 50V Ceramic Capacitor
CCOMP21.8nF, 50V Ceramic Capacitor
CSS18nF, 50V Ceramic Capacitor or 20nF, 80V Ceramic CapacitorGCM21B5C1H183JA16 or GCM21B5C1K203JA16
RFB,top71.5kΩ
RFB,bot4.7kΩ
RnFLT10kΩ
RIMONOUT82kΩ
CIN12× 10µF, 50V Ceramic CapacitorGCM32EC71H106KA03
CIN21× 100μF, 63V Aluminum CapacitorPCR1J101MCL1GS
M1N-Channel 40V MOSFET, RDS(on) = 4.3mΩSQJ422EP
M2N-Channel 40V MOSFET, RDS(on) = 4.3mΩSQJ422EP
M3N-Channel 40V MOSFET, RDS(on) = 4.3mΩSQJ422EP
M4N-Channel 40V MOSFET, RDS(on) = 4.3mΩSQJ422EP
RCS

1.00mΩ

3xKRL2012E-C-R003-F
L11.8μH, DCR = 3.2mΩIHLP-5050FD-A1
COUT15× 10µF, 50V Ceramic CapacitorGCM32EC71H106KA03
COUT21× 100μF, 63V Aluminum CapacitorPCR1J101MCL1GS
RISNS4mΩKRL2012E-C-R004-F
CBST10.1µF, 35V Ceramic CapacitorGRT033R6YA104KE01
CBST20.1µF, 35V Ceramic CapacitorGRT033R6YA104KE01
CVCC47µF, 6.3V Ceramic CapacitorGRM188R60J476ME15D
RUVLO,top75kΩ
RUVLO,bot20.5kΩ
RSLOPE69.8kΩ
RCFG13.3kΩ
RRT75kΩ