Overview
The DRV8870DDAR is a compact H-bridge motor driver integrated circuit designed by Texas Instruments for controlling brushed DC motors. It's packaged in a thermally-enhanced HSOP-8 (DDAR) package, making it suitable for space-constrained applications. The device operates from a 6.5V to 45V supply range and can deliver up to 3.6A of continuous output current. Its integrated design reduces board space requirements compared to discrete solutions while providing robust motor control capabilities.
Structure and Working Principle
The DRV8870DDAR contains four N-channel MOSFETs arranged in an H-bridge configuration, allowing bidirectional control of a single brushed DC motor. The integrated charge pump generates the necessary gate drive voltages for the high-side MOSFETs. Control is implemented through PWM input signals, with built-in current regulation using an adjustable off-time PWM current chopping scheme. The device includes a low-power sleep mode to reduce power consumption when not active.
Key Features
The DRV8870DDAR offers multiple protection features including undervoltage lockout, overcurrent protection, and overtemperature shutdown. These protections make it particularly suitable for automotive and industrial applications where reliability is critical. The device provides excellent thermal performance through its PowerPAD package and supports a wide operating temperature range (-40°C to +125°C). Its simple control interface requires minimal external components, reducing design complexity and BOM cost.
Application Areas
Primary applications include automotive systems (mirror adjustment, seat positioning), industrial automation (actuators, conveyor belts), and robotics (joint control, wheel drives). The DRV8870DDAR is also used in consumer appliances, medical devices, and battery-powered equipment where efficient motor control is required. Its wide voltage range makes it versatile for various power supply configurations.
Maintenance and Precautions
Proper PCB layout is essential for optimal thermal performance. The PowerPAD must be soldered to a thermal pad on the PCB connected to ground. Adequate copper area should be provided for heat dissipation. When designing with this IC, pay particular attention to decoupling capacitor placement and motor current paths. ESD precautions should be observed during handling, and inputs should not exceed the absolute maximum ratings specified in the datasheet.
B2B Procurement Guide
When procuring DRV8870DDAR ICs, verify the manufacturer (Texas Instruments) and package type (DDAR) to ensure compatibility. Consider ordering from authorized distributors to guarantee authenticity. For production volumes, request samples for testing and inquire about lead times. The device is typically available in tape and reel packaging for automated assembly. Check for compliance with relevant industry standards for your application (e.g., AEC-Q100 for automotive use).