SNVS954H February   2013  – June 2017 LM5122

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings: LM5122, LM5122Z
    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  Undervoltage Lockout (UVLO)
      2. 7.3.2  High Voltage VCC Regulator
      3. 7.3.3  Oscillator
      4. 7.3.4  Slope Compensation
      5. 7.3.5  Error Amplifier
      6. 7.3.6  PWM Comparator
      7. 7.3.7  Soft-Start
      8. 7.3.8  HO and LO Drivers
      9. 7.3.9  Bypass Operation (VOUT = VIN)
      10. 7.3.10 Cycle-by-Cycle Current Limit
      11. 7.3.11 Clock Synchronization
      12. 7.3.12 Maximum Duty Cycle
      13. 7.3.13 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 MODE Control (Forced-PWM Mode and Diode-Emulation Mode)
      2. 7.4.2 MODE Control (Skip-Cycle Mode and Pulse-Skipping Mode)
      3. 7.4.3 Hiccup-Mode Overload Protection
      4. 7.4.4 Slave Mode and SYNCOUT
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Feedback Compensation
      2. 8.1.2 Sub-Harmonic Oscillation
      3. 8.1.3 Interleaved Boost Configuration
      4. 8.1.4 DCR Sensing
      5. 8.1.5 Output Overvoltage Protection
      6. 8.1.6 SEPIC Converter Simplified Schematic
      7. 8.1.7 Non-Isolated Synchronous Flyback Converter Simplified Schematic
      8. 8.1.8 Negative to Positive Conversion
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Custom Design With WEBENCH® Tools
        2. 8.2.2.2  Timing Resistor RT
        3. 8.2.2.3  UVLO Divider RUV2, RUV1
        4. 8.2.2.4  Input Inductor LIN
        5. 8.2.2.5  Current Sense Resistor RS
        6. 8.2.2.6  Current Sense Filter RCSFP, RCSFN, CCS
        7. 8.2.2.7  Slope Compensation Resistor RSLOPE
        8. 8.2.2.8  Output Capacitor COUT
        9. 8.2.2.9  Input Capacitor CIN
        10. 8.2.2.10 VIN Filter RVIN, CVIN
        11. 8.2.2.11 Bootstrap Capacitor CBST and Boost Diode DBST
        12. 8.2.2.12 VCC Capacitor CVCC
        13. 8.2.2.13 Output Voltage Divider RFB1, RFB2
        14. 8.2.2.14 Soft-Start Capacitor CSS
        15. 8.2.2.15 Restart Capacitor CRES
        16. 8.2.2.16 Low-Side Power Switch QL
        17. 8.2.2.17 High-Side Power Switch QH and Additional Parallel Schottky Diode
        18. 8.2.2.18 Snubber Components
        19. 8.2.2.19 Loop Compensation Components CCOMP, RCOMP, CHF
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

4 Revision History

Changes from May 1, 2017 to June 9, 2017

  • Changed by splitting out the automotive datasheet from this commercial datasheet Go
  • Added 24-pin HTTSOP package optionGo
  • Added links for WEBENCH Go
  • Added 24-HTSSOP pin configurationGo
  • Added 24-HTSSOP Functions Go
  • Changed UVLO valueGo
  • Changed VCC value Go
  • Changed one NC value Go
  • Changed from outlet to contact Go
  • Added LM5122Z part number Go
  • Changed 20-HTSSOP Thermal Information and added 24-HTSSOP thermal valuesGo
  • Added ICSP –ICSN (LM5122Z only) specsGo
  • Added No load, 50% to 50% (LM5122Z only) specsGo
  • Added 24-pin HTSSOPGo
  • Added Negative to Positive conversion exampleGo

Changes from F Revision (May 2015) to G Revision

  • Added Automotive ESD featureGo
  • Added paragraph and second equation Go
  • Changed equation Go

Changes from E Revision (December 2014) to F Revision

  • Changed Handling Ratings to ESD Ratings and moved Storage temperature to Absolute Max Ratings Go
  • Added Ohm symbol in Current Sense Resistor RS equation 28Go
  • Changed typo to reflect an Ohm symbol in Current Sense Resistor RS equation 29Go

Changes from D Revision (September 2013) to E Revision

  • Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

Changes from C Revision (August, 2013) to D Revision

  • Changed 5 kΩ to 20 kΩGo
  • Changed CCOMP to CHF Go

Changes from B Revision (May, 2013) to C Revision

  • Deleted Package AddendumGo

Changes from A Revision (May, 2013) to B Revision

  • Deleted Device Info tableGo

Changes from * Revision (March, 2013) to A Revision

  • Released full datasheet.Go