SLVSHI4A October   2025  – December 2025 DRV81545

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specification
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Integrated Clamp Diode, VCLAMP
      2. 6.3.2 Protection Circuits
        1. 6.3.2.1 ILIM Analog Current Limit
          1. 6.3.2.1.1 Effect of Load Resistance on Power Dissipation Before TSD
        2. 6.3.2.2 Cut-Off Delay (COD)
        3. 6.3.2.3 Thermal Shutdown (TSD)
        4. 6.3.2.4 Undervoltage Lockout (UVLO)
      3. 6.3.3 Fault Conditions Summary
    4. 6.4 Device Functional Modes
      1. 6.4.1 Hardware Interface Operation
      2. 6.4.2 Parallel Outputs
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 External Components
      2. 7.2.2 Continuous Current Capability
      3. 7.2.3 Power Dissipation
      4. 7.2.4 Application Curves
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Bulk Capacitance
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.1 Overview

The DRV81545 is a four-channel low-side switch driver that operates from 4.5V to 55V and supports a wide range of load currents. The device integrates four low-side switches with a RDS(on) of 235mΩ, each with a freewheeling diode to the VCLAMP pin. This feature allows the user to either recirculate current or connect an external TVS for inductive load turn-off.

The device can be controlled through a hardware GPIO interface. Each channel features individual overtemperature protection, and an analog adjustable current limit with an external resistor on the ILIM pin. There is an optional cut-off delay (COD) configuration which limits the duration of a current-limiting condition on the respective channel, helping to prevent damage to the device or the load. Faults are indicated on a fault output pin (nFAULT).