SNOSD98A May   2020  – December 2020 LM7481-Q1

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
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Charge Pump
      2. 8.3.2 Dual Gate Control (DGATE, HGATE)
        1. 8.3.2.1 Reverse Battery Protection (A, C, DGATE)
        2. 8.3.2.2 Load Disconnect Switch Control (HGATE, OUT)
      3. 8.3.3 Over Voltage Protection and Battery Voltage sensing (VSNS, SW, OV)
      4. 8.3.4 Low Iq Shutdown and Under Voltage Lockout (EN/UVLO)
    4. 8.4 Device Functional Modes
    5. 8.5 Application Examples
      1. 8.5.1 Redundant Supply OR-ing with Inrush Current Limiting, Over Voltage Protection and ON/OFF Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical 12-V Reverse Battery Protection Application
      1. 9.2.1  Design Requirements for 12-V Battery Protection
      2. 9.2.2  Automotive Reverse Battery Protection
      3. 9.2.3  Input Transient Protection: ISO 7637-2 Pulse 1
      4. 9.2.4  AC Super Imposed Input Rectification: ISO 16750-2 and LV124 E-06
      5. 9.2.5  Input Micro-Short Protection: LV124 E-10
      6. 9.2.6  Detailed Design Procedure
        1. 9.2.6.1 Design Considerations
        2. 9.2.6.2 Charge Pump Capacitance VCAP
        3. 9.2.6.3 Input and Output Capacitance
        4. 9.2.6.4 Hold-up Capacitance
        5. 9.2.6.5 Over Voltage Protection and Battery Monitor
      7. 9.2.7  MOSFET Selection: Blocking MOSFET Q1
      8. 9.2.8  MOSFET Selection: Hot-Swap MOSFET Q2
      9. 9.2.9  TVS selection
      10. 9.2.10 Application Curves
    3. 9.3 Do's and Don'ts
  10. 10Power Supply Recommendations
    1. 10.1 Transient Protection
    2. 10.2 TVS Selection for 12-V Battery Systems
    3. 10.3 TVS Selection for 24-V Battery Systems
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

6.6 Switching Characteristics

TJ = –40°C to +125°C; typical values at TJ = 25°C, V(A) = V(C) = V(OUT) = V(VS) = 12V, V(AC) = 20 mV, C(VCAP) = 0.1 µF, V(EN/UVLO) = 2 V, over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tDGATE_OFF(dly) DGATE Turnoff Delay during reverse voltage detection V(A) – V(C) = +30 mV to –100 mV to V(DGATE–A) < 1 V, C(DGATE–A) = 10 nF 0.5 0.875 µs
tDGATE_ON(dly) DGATE Turnon Delay during forward voltage detection V(A) – V(C) = –20 mV to +700 mV to V(DGATE-A) > 5 V, C(DGATE-A) = 10 nF 0.85 1.6 µs
tEN(dly)_DGATE DGATE Turnon Delay during EN/UVLO EN/UVLO ↑ to V(DGATE-A) > 5V, C(DGATE-A) = 10 nF 98 175 270 µs
tEN_OFF(deg)_DGATE DGATE Turnoff Deglitch during EN/UVLO EN/UVLO ↓ to DGATE ↓ 8.1 µs
tEN_OFF(deg)_HGATE HGATE Turnoff Deglitch during EN/UVLO EN/UVLO ↓ to HGATE ↓ 3 4.6 6 µs
tOVP_OFF(deg)_HGATE HGATE Turnoff Deglitch during OV OV ↑ to HGATE ↓ 3.98 5.4 µs
tOVP_ON(deg)_HGATE HGATE Turnon Deglitch during OV OV ↓ to HGATE ↑ 2.95 µs