SNOSDC0A October   2020  – December 2020 LM7310

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 Timing Requirements
    7. 6.7 Switching Characteristics
    8.     14
    9. 6.8 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 Input Reverse Polarity Protection
      2. 7.3.2 Undervoltage Protection (UVLO & UVP)
      3. 7.3.3 Overvoltage Lockout (OVLO)
      4. 7.3.4 Inrush Current control and Fast-trip
        1. 7.3.4.1 Slew Rate (dVdt) and Inrush Current Control
        2. 7.3.4.2 Fast-Trip During Steady State
      5. 7.3.5 Analog Load Current Monitor Output
      6. 7.3.6 Reverse Current Protection
      7. 7.3.7 Overtemperature Protection (OTP)
      8. 7.3.8 Fault Response
      9. 7.3.9 Power Good Indication (PG)
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Single Device, Self-Controlled
      1. 8.2.1 Typical Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Setting Undervoltage and Overvoltage Thresholds
          2. 8.2.1.2.2 Setting Output Voltage Rise Time (tR)
          3. 8.2.1.2.3 Setting Power Good Assertion Threshold
          4. 8.2.1.2.4 Setting Analog Current Monitor Voltage (IMON) Range
        3. 8.2.1.3 Application Curves
    3. 8.3 Active ORing
    4. 8.4 Priority Power MUXing
    5. 8.5 USB PD Port Protection
    6. 8.6 Parallel Operation
  9. 9 Power Supply Recommendations
    1. 9.1 Transient Protection
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support 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

7.3.3 Overvoltage Lockout (OVLO)

The LM73100 allows the user to implement overvoltage lockout to protect the load from input overvoltage conditions. The OVLO comparator on the OVLO pin allows the overvoltage protection threshold to be adjusted to a user defined value. Once the voltage at the OVLO pin crosses the OVLO rising threshold VOV(R), the device turns off the power to the output. Thereafter, the devices wait for the voltage at the OVLO pin to fall below the OVLO falling threshold VOV(F) before the output power is turned ON again. The rising and falling thresholds are slightly different to provide hysterisis. The Figure 7-2 and Equation 2 below show how a resistor divider can be used to set the OVLO set point for a given input supply voltage.

GUID-26F49D5D-45D6-42EC-AF9B-2BCE04079F02-low.gifFigure 7-2 Adjustable Overvoltage Protection
Equation 2. GUID-20201002-CA0I-XGWT-0RBJ-S70DXKNMZBB4-low.gif

While recovering from an overvoltage event, the LM73100 starts up with inrush control (dVdt).

GUID-20201002-CA0I-0ZKV-ZGWC-ZZWHNCHGKX36-low.gifFigure 7-3 LM73100 Overvoltage Lockout and Recovery