SLVSNG2 August   2026 DRV8378-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings AUTO
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 SPI Timing Requirements
    7. 6.7 SPI Mode Timings
  8. 7 Detailed Description
    1. 7.1  Overview
    2. 7.2  Functional Block Diagram
    3. 7.3  Feature Description
      1. 7.3.1 Output Stage
      2. 7.3.2 Device Interface Modes
        1. 7.3.2.1 Serial Peripheral Interface (SPI)
        2. 7.3.2.2 Hardware Interface
      3. 7.3.3 Control Modes
        1. 7.3.3.1 3x PWM Mode (PWM_MODE = 10b or 11b or MODE_SR Pin is Connected to GVDD with RMODE or to GVDD)
        2. 7.3.3.2 6x PWM Mode (PWM_MODE = 00b or 01b or MODE_SR Pin Tied to AGND or in Hi-Z)
        3. 7.3.3.3 DRV8378G Control mode with External GVDD
      4. 7.3.4 GVDD Linear Voltage Regulator
      5. 7.3.5 Charge Pump
    4. 7.4  Slew Rate Control
    5. 7.5  Cross Conduction (Dead Time)
    6. 7.6  Propagation Delay
    7. 7.7  Pin Diagrams
      1. 7.7.1 Logic Level Input Pin (Internal Pulldown)
      2. 7.7.2 Logic Level Input Pin (Internal Pullup)
      3. 7.7.3 Open Drain Pin
      4. 7.7.4 Push Pull Pin
    8. 7.8  Current Sense Amplifiers
      1. 7.8.1 Current Sense Amplifier Operation (29-pin variant)
    9. 7.9  Active Demagnetization
      1. 7.9.1 Automatic Synchronous Rectification Mode (ASR Mode)
        1. 7.9.1.1 Automatic Synchronous Rectification in Commutation
        2. 7.9.1.2 Automatic Synchronous Rectification in PWM Mode
      2. 7.9.2 Automatic Asynchronous Rectification Mode (AAR Mode)
    10. 7.10 Cycle-by-Cycle Current Limit
      1. 7.10.1 Cycle by Cycle Current Limit with 100% Duty Cycle Input
    11. 7.11 Protections
      1. 7.11.1 Overcurrent Protection (OCP)
        1. 7.11.1.1 OCP Latched Shutdown (OCP_MODE = 00b)
        2. 7.11.1.2 OCP Automatic Retry (OCP_MODE = 01b)
        3. 7.11.1.3 OCP Disabled (OCP_MODE = 11b)
        4. 7.11.1.4 OCP Report Only (OCP_MODE = 10b)
      2. 7.11.2 VM Supply Undervoltage Lockout (RESET)
      3. 7.11.3 GVDD Undervoltage Lockout (GVDD_UV)
      4. 7.11.4 VCP Charge Pump Undervoltage Lockout (CPUV)
      5. 7.11.5 Over Voltage Protections (OV)
      6. 7.11.6 Thermal Warning (OTW)
      7. 7.11.7 Thermal Shutdown (OTS)
    12. 7.12 Device Functional Modes
      1. 7.12.1 Functional Modes
        1. 7.12.1.1 Sleep Mode
        2. 7.12.1.2 Operating Mode
        3. 7.12.1.3 Fault Reset (CLR_FLT or nSLEEP Reset Pulse)
      2. 7.12.2 DRVOFF functionality
    13. 7.13 SPI Communication
      1. 7.13.1 Programming
        1. 7.13.1.1 SPI Format
  9. 8 Register Map
    1. 8.1 CONTROL Registers
    2. 8.2 STATUS Registers
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Power Supply Recommendations
      1. 9.2.1 Bulk Capacitance
    3. 9.3 Layout
      1. 9.3.1 Layout Guidelines
      2. 9.3.2 Layout Example
      3. 9.3.3 Thermal Considerations
        1. 9.3.3.1 Power Dissipation
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1.     PACKAGE OPTION ADDENDUM
    2. 11.1 Tape and Reel Information

7.10 Cycle-by-Cycle Current Limit

The current-limit circuit activates if the current flowing through the low-side MOSFET exceeds the ILIMIT current. This feature restricts motor current to less than the ILIMIT.

The current-limit circuitry utilizes the current sense amplifier output of the three phases compared with the voltage at ILIMIT pin. shows the implementation of current limit circuitry. As shown in , the output of current sense amplifiers is combined with star connected resistive network. This measured voltage VMEAS is compared with the external reference voltage VILIM pin to realize the current limit implementation. The relation between current sensed on OUTX pin and VMEAS threshold is given as:

where

  • IOUTX is current flowing into the low-side MOSFET
  • CSA_GAIN is the current sense amplifier gain

Note:

During the brake operation, a high-current can flow through the low-side FETs which can eventually trigger the over current protection circuit. This allows the body-diode of the high-side FET to conduct and pump brake energy to the VM supply rail.