Dual Pololu DRV8835 Engine Driver

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This tiny breakout board for TI’s DRV8835 dual motor driver can deliver 1.2 A per channel continuously (1.5 A peak) to a pair of DC motors, and it supports two possible control interfaces for added flexibility of use: IN/IN and PHASE/ENABLE.

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With an operating voltage range from 0 V to 11 V and built-in protection against reverse-voltage, under-voltage, over-current, and over-temperature, this driver is a great solution for powering up to two small, low-voltage motors. The carrier board has the form factor of a 14-pin DIP package, which makes it easy to use with standard solderless breadboards and 0.1″ perfboards.

DESCRIPTION

OVERVIEW

Texas Instruments’ DRV8835 is a tiny dual H-bridge motor driver IC that can be used for bidirectional control of two brushed DC motors at 0 V to 11 V. It can supply up to about 1.2 A per channel continuously and can tolerate peak currents up to 1.5 A per channel for a few seconds, making it an ideal driver for small motors that run on relatively low voltages. The DRV8835 is a great IC, but its small, leadless package makes it difficult for the typical student or hobbyist to use; our breakout board gives this driver the form factor of a 14-pin DIP package, which makes it easy to use with standard solderless breadboards and 0.1″ perfboards. Since this board is a carrier for the DRV8835. The board ships populated with SMD components, including the DRV8835, and adds a FET for reverse battery protection.

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DRV8835 dual motor driver carrier, bottom view with dimensions

Features

  • Dual-H-bridge motor driver: can drive two DC motors or one bipolar stepper motor
  • Motor supply voltage: 0 V to 11 V
  • Logic supply voltage: 2 V to 7 V
  • Output current: 1.2 A continuous (1.5 A peak) per motor
  • Motor outputs can be paralleled to deliver 2.4 A continuous (3 A peak) to a single motor
  • Two possible interface modes: IN/IN (outputs mostly mirror inputs) or PHASE/ENABLE (one pin for direction and another for speed)
  • Inputs are 3V- and 5V-compatible
  • Under-voltage lockout on the logic supply and protection against over-current and over-temperature
  • Reverse-voltage protection on the motor supply
  • Compact size (0.7″×0.4″) with the form factor of a 14-pin DIP package

Pinout

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Real-world power dissipation considerations

The DRV8835 datasheet recommends a maximum continuous current of 1.5 A per motor channel. However, the chip by itself will overheat at lower currents. For example, in our tests at room temperature with no forced air flow, the chip was able to deliver 1.5 A per channel for approximately 15 seconds before the chip’s thermal protection kicked in and disabled the motor outputs, while a continuous current of 1.2 A per channel was sustainable for many minutes without triggering a thermal shutdown.

Note that when both the logic and motor supply voltages are low (on order of a few volts), the driver will start overheating sooner and the maximum achievable output current will be lower than what we observed in the tests mentioned above.

The actual current you can deliver will depend on how well you can keep the motor driver cool. The carrier’s printed circuit board is designed to draw heat out of the motor driver chip, but performance can be improved by adding a heat sink. Our tests were conducted at 100% duty cycle; PWMing the motor will introduce additional heating proportional to the frequency.

This product can get hot enough to burn you long before the chip overheats. Take care when handling this product and other components connected to it.

Schematic

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Schematic of the DRV8835 dual motor driver carrier

SPECS

Notes:

  1. Without included hardware.
  2. Typical results with VIN=5 V, VCC=5 V, and 100% duty cycle at room temperature.

RESOURCES

Recommended links

Texas Instruments DRV8835 product page

    Texas Instruments product page for the DRV8835, where you can find the latest datasheet and additional resources.

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Dual Pololu DRV8835 Engine Driver

Dual Pololu DRV8835 Engine Driver

This tiny breakout board for TI’s DRV8835 dual motor driver can deliver 1.2 A per channel continuously (1.5 A peak) to a pair of DC motors, and it supports two possible control interfaces for added flexibility of use: IN/IN and PHASE/ENABLE.

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