SLVSGF5A May   2023  – December 2023 DRV8845

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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 Operating Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Motor Configurations
      2. 7.3.2 Stepper Control Logic
      3. 7.3.3 DC Motor Control
      4. 7.3.4 PWM Current Control
      5. 7.3.5 Current Regulation and Decay Mode
      6. 7.3.6 Blanking Time
      7. 7.3.7 Charge Pump
      8. 7.3.8 Logic-Level Pin Diagram
      9. 7.3.9 Protection Circuits
        1. 7.3.9.1 VM Undervoltage Lockout (UVLO)
        2. 7.3.9.2 VCP Undervoltage Lockout (CPUV)
        3. 7.3.9.3 Overcurrent Protection (OCP)
        4. 7.3.9.4 Thermal Shutdown (OTSD)
        5. 7.3.9.5 Fault Condition Summary
    4. 7.4 Device Functional Modes
      1. 7.4.1 Sleep Mode (nSLEEP = 0)
      2. 7.4.2 Operating Mode (nSLEEP = 1)
      3. 7.4.3 nSLEEP Reset Pulse
      4. 7.4.4 Functional Modes Summary
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Application Schematics
    3. 8.3 Application Curves
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Bulk Capacitance
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.1 Overview

The DRV8845 is designed to operate two stepper motors, up to four DC motors, or one stepper and one or two DC motors. The device integrates four N-channel power MOSFET H-bridges. The DRV8845 is footprint and software compatible with similar quad H-Bridge motor drivers from other vendors. The DRV8845 can be powered with a supply voltage between 4.5 and 38 V. The device is capable of providing an output current up to 2.5-A peak or 1.5-A full-scale. The actual full-scale and rms current depends on the ambient temperature, supply voltage, and PCB thermal capability.

The currents in each of the output full-bridges are regulated with pulse width modulated (PWM) control circuitry. Each full-bridge peak current is set by the value of an external current sense resistor, RSENSEx , and a reference voltage, VREFx.

A simple PHASE/I0/I1 interface allows easy interfacing to the controller circuit. With this interface, a stepper motor can be driven in full-step, half-step or quarter-step modes. Higher resolution step modes can be programmed by dynamically changing the voltage on the VREFx pins. Also, the DRV8845 supports driving brushed-DC motors in forward, reverse and coast modes. A low-power sleep mode is included which allows the system to save power when not driving the motor.