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

7.4.1.3 Independent Half-Bridge Control Mode (MODE = Hi-Z)

When the MODE pin is floating (Hi-Z), the device is in half-bridge control mode. This mode allows for each half-bridge to be directly controlled to support high-side slow decay (or brake), driving two independent loads, or paralleling the outputs for higher current capability for a single load. Table 7-5 shows the truth table for independent half-bridge mode. The Hi-Z state for the MODE pin can be implemented by setting the microcontroller GPIO pin as an Input for the MODE pin.

The half-bridge control mode does not support autosleep mode. One way to enter autosleep mode is to set the MODE, IN1, and IN2 pins to logic low, which puts the device into PWM mode and autosleep entry. Alternatively, the VCC pin can be supplied from a microcontroller GPIO pin where setting the GPIO pin low brings the device into undervoltage lockout (UVLO) condition with the outputs all Hi-Z. See Section 7.5.2 for more details.

To wake up the DRV8218 in half-bridge mode, bring VCC high, then set IN1 or IN2 high for longer than tWAKE before returning low or sending a PWM signal. Figure 8-18 and Figure 8-19 show this wake-up procedure.

Table 7-5 Half-bridge control mode
VCC MODE IN1 IN2 OUT1 OUT2 DESCRIPTION
0V X X X Hi-Z Hi-Z Low-power sleep mode in UVLO
1.8 - 5.5V 0 0 0 Hi-Z Hi-Z (Not Independent half-bridge mode) H-bridge disabled/low-power automatic sleep mode
1.8 - 5.5V Hi-Z 0 X L X OUT1 low-side On
1.8 - 5.5V Hi-Z 1 X H X OUT1 high-side On
1.8 - 5.5V Hi-Z X 0 X L OUT2 low-side On
1.8 - 5.5V Hi-Z X 1 X H OUT2 high-side On