DRV8870LDDAR

Overview

The DRV8870LDDAR is a single H-bridge motor driver manufactured by Texas Instruments, designed for brushed DC and stepper motor applications. It operates within a supply voltage range of 6.5V to 45V and delivers a continuous output current of 3.6A with peak capabilities up to 5.2A. The device utilizes an NMOS technology architecture housed in an 8-pin SO PowerPAD (HSOP-8) surface-mount package. It features integrated current regulation via external sensing resistors, PWM control interfaces, and comprehensive protection mechanisms including overcurrent, overtemperature, and undervoltage lockout.

Feature Summary

• Integrates a complete H-bridge power stage with four N-channel MOSFETs for bidirectional motor control
• Provides analog current regulation capability through external sense resistors connected to ISEN pins
• Supports low-power sleep mode operation to minimize static current consumption when inactive
• Includes built-in fault protection against short circuits, overcurrent conditions, and thermal overload

Applications

• Brushed DC motor drives in consumer electronics and home appliances
• Stepper motor winding control in general-purpose motion systems
• Solenoid and valve actuation in industrial automation equipment
• Battery-powered mobile devices requiring efficient motor management

Procurement Notes

Verify the specific suffix 'LDDAR' against the official Texas Instruments datasheet to confirm pinout compatibility and electrical specifications. Ensure that the selected variant matches the required thermal performance and packaging standards for the target application environment. Cross-reference ordering information with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a single H-bridge topology is sufficient for driving brushed DC or unipolar stepper motors. Consider the 45V maximum supply limit and 3.6A continuous current rating for load matching. Evaluate PCB thermal design requirements due to the exposed power pad, ensuring adequate copper area for heat dissipation under high-current operating conditions.

Part Context

The DRV8870 series represents a family of highly integrated motor drivers from Texas Instruments, combining logic control and power stages in a compact footprint. The DRV8870LDDAR specifically denotes a version within this lineup optimized for cost-effective solutions in mass-produced electronic devices. It shares architectural similarities with other members like the DRV8871 but differs in bridge configuration and feature sets.

Replacement Considerations

• DRV8870DDAR
• DRV8870DDW

FAQ

How is the current regulation function implemented in the DRV8870LDDAR?

Current regulation is achieved by connecting an external sense resistor between the motor output and ground. The resulting voltage drop is monitored by the internal circuitry to limit peak current and protect against stall conditions.

What control interface does the DRV8870LDDAR support for speed adjustment?

The device supports Pulse Width Modulation (PWM) input on its logic pins to regulate motor speed. The duty cycle of the PWM signal determines the average voltage applied to the motor load.