SNVS480J January   2007  – July 2020 LM5022

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 High-Voltage Start-Up Regulator
      2. 7.3.2 Input Undervoltage Detector
      3. 7.3.3 Error Amplifier
      4. 7.3.4 Current Sensing and Current Limiting
      5. 7.3.5 PWM Comparator and Slope Compensation
      6. 7.3.6 Soft Start
      7. 7.3.7 MOSFET Gate Driver
      8. 7.3.8 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Oscillator, Shutdown, and SYNC
  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  Switching Frequency
        2. 8.2.2.2  MOSFET
        3. 8.2.2.3  Output Diode
        4. 8.2.2.4  Boost Inductor
        5. 8.2.2.5  Output Capacitor
        6. 8.2.2.6  VCC Decoupling Capacitor
        7. 8.2.2.7  Input Capacitor
        8. 8.2.2.8  Current Sense Filter
        9. 8.2.2.9  RSNS, RS2, and Current Limit
        10. 8.2.2.10 Control Loop Compensation
        11. 8.2.2.11 Efficiency Calculations
          1. 8.2.2.11.1 Chip Operating Loss
          2. 8.2.2.11.2 MOSFET Switching Loss
          3. 8.2.2.11.3 MOSFET and RSNS Conduction Loss
          4. 8.2.2.11.4 Output Diode Loss
          5. 8.2.2.11.5 Input Capacitor Loss
          6. 8.2.2.11.6 Output Capacitor Loss
          7. 8.2.2.11.7 Boost Inductor Loss
          8. 8.2.2.11.8 Total Loss
          9. 8.2.2.11.9 Efficiency
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Filter Capacitors
      2. 10.1.2 Sense Lines
      3. 10.1.3 Compact Layout
      4. 10.1.4 Ground Plane and Shape Routing
    2. 10.2 Layout Examples
  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 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2 Detailed Design Procedure

Table 2 lists the bill of materials for this design example.

Table 2. BOM for Example Circuit

ID PART NUMBER TYPE SIZE PARAMETERS QTY VENDOR
U1 LM5022 Low-Side Controller 10-pin VSSOP 60 V 1 TI
Q1 Si4850EY MOSFET SO-8 60 V, 31 mΩ, 27 nC 1 Vishay
D1 CMSH2-60M Schottky Diode SMA 60 V, 2 A 1 Central Semi
L1 SLF12575T-M3R2 Inductor 12.5 × 12.5 × 7.5 mm 33 µH, 3.2 A, 40 mΩ 1 TDK
Cin1, Cin2 C4532X7R1H475M Capacitor 1812 4.7 µF, 50 V, 3 mΩ 2 TDK
Co1, Co2 C5750X7R2A475M Capacitor 2220 4.7 µF,100 V, 3 mΩ 2 TDK
Cf C2012X7R1E105K Capacitor 0805 1 µF, 25 V 1 TDK
Cinx
Cox		 C2012X7R2A104M Capacitor 0805 100 nF, 100 V 2 TDK
C1 VJ0805A561KXXAT Capacitor 0805 560 pF 10% 1 Vishay
C2 VJ0805Y124KXXAT Capacitor 0805 120 nF 10% 1 Vishay
Css VJ0805Y103KXXAT Capacitor 0805 10 nF 10% 1 Vishay
Ccs VJ0805Y102KXXAT Capacitor 0805 1 nF 10% 1 Vishay
R1 CRCW08053011F Resistor 0805 3.01 kΩ 1% 1 Vishay
Rfb1 CRCW08056490F Resistor 0805 649 Ω 1% 1 Vishay
Rfb2 CRCW08052002F Resistor 0805 20 kΩ 1% 1 Vishay
Rs1 CRCW0805101J Resistor 0805 100 Ω 5% 1 Vishay
Rs2 CRCW08053571F Resistor 0805 3.57 kΩ 1% 1 Vishay
Rsns ERJL14KF10C Resistor 1210 100 mΩ, 1%, 0.5 W 1 Panasonic
Rt CRCW08053322F Resistor 0805 33.2 kΩ 1% 1 Vishay
Ruv1 CRCW08052611F Resistor 0805 2.61 kΩ 1% 1 Vishay
Ruv2 CRCW08051002F Resistor 0805 10 kΩ 1% 1 Vishay