SLVSI75 May   2026 DRV8218

ADVANCE INFORMATION  

  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 Transient Current Capability
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 External Components
    4. 7.4 Feature Description
      1. 7.4.1 Control Modes
        1. 7.4.1.1 PWM Control Mode (MODE = 0)
        2. 7.4.1.2 PH/EN Control Mode (MODE = 1)
        3. 7.4.1.3 Independent Half-Bridge Control Mode (MODE = Hi-Z)
      2. 7.4.2 Pin Diagrams
        1. 7.4.2.1 Logic-Level Inputs
        2. 7.4.2.2 Tri-Level Input
      3. 7.4.3 Protection Circuits
        1. 7.4.3.1 Supply Undervoltage Lockout (UVLO)
        2. 7.4.3.2 OUTx Overcurrent Protection (OCP)
        3. 7.4.3.3 Thermal Shutdown (TSD)
    5. 7.5 Device Functional Modes
      1. 7.5.1 Active Mode
      2. 7.5.2 Low-Power Sleep Mode
      3. 7.5.3 Fault Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Full-Bridge Driving
        1. 8.2.1.1 Supply Voltage
        2. 8.2.1.2 Control Interface - Full Bridge
        3. 8.2.1.3 Low-Power Operation
        4. 8.2.1.4 Application Curves
      2. 8.2.2 Half-Bridge Driving
        1. 8.2.2.1 Control Interface
        2. 8.2.2.2 Low-Power Operation
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Parallel Multiple Drivers
      4. 8.2.4 Dual-Coil Relay Driving
        1. 8.2.4.1 Control Interface
        2. 8.2.4.2 Low-Power Operation
        3. 8.2.4.3 Application Curves
      5. 8.2.5 Current Sense
        1. 8.2.5.1 Design Requirements
        2. 8.2.5.2 Detailed Design Procedure
          1. 8.2.5.2.1 Shunt Resistor Sizing
          2. 8.2.5.2.2 RC Filter
    3. 8.3 Current Capability and Thermal Performance
      1. 8.3.1 Power Dissipation and Output Current Capability
    4. 8.4 Power Supply Recommendations
      1. 8.4.1 Bulk Capacitance
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Mechanical, Packaging, and Orderable Information

7.4.1 Control Modes

The DRV8218 provides three modes to support different control schemes with the PH/IN1 and EN/IN2 pins. The MODE pin selects the control interface mode by setting the pin either logic low, logic high, or Hi-Z as shown in Table 7-2. The MODE pin state is not latching, so the mode can be changed during operation.

Table 7-2 MODE pin functions
MODE STATE CONTROL MODE
MODE = Logic Low PWM
MODE = Logic High PH/EN
MODE = Hi-Z Independent Half-Bridge

The inputs can accept DC or pulse-width modulated (PWM) voltage signals with duty cycles from 0% to 100%. The PH/IN1, and EN/IN2 pins have internal pulldown resistors to keep the outputs Hi-Z if no inputs are present (the only exception is half-bridge mode, where OUTx = LOW if INx is floating).

The following sections show the truth tables for each control mode. Additionally, the DRV8218 automatically handles the dead-time generation when switching between the high-side and low-side MOSFET of a half-bridge. Figure 7-2 describes the naming and configuration for the various H-bridge states described in the following sections.

DRV8218 H-bridge statesFigure 7-2 H-bridge states