Texas Instruments DRV8849 Dual Stepper Motor Driver

Texas Instruments DRV8849 Dual Stepper Motor Driver is designed for industrial and consumer applications. The device is fully integrated with four N-channel power MOSFET H-bridge drivers, one micro-stepping indexer for each stepper, and integrated current sensing. The DRV8849 can drive up to 1.5A full-scale output current (dependent on PCB design).

The Texas Instruments DRV8849 uses an internal current sense architecture to eliminate the need for four external power sense resistors, saving PCB area and system costs. The device uses an internal PWM current regulation scheme with smart tune decay mode. Smart tune automatically adjusts for desired current regulation, compensates for motor variation and aging effects, and reduces audible noise and vibration from the motor.

Simple STEP/DIR interfaces allow an external controller to manage the direction and step rate of the stepper motors. The device can be configured in full-step to 1/256 micro-stepping. A low-power sleep mode is provided using a dedicated nSLEEP pin. Protection features are provided for supply undervoltage, charge pump faults, overcurrent, short circuits, and overtemperature. Fault conditions are indicated by one nFAULT pin for each stepper.

Features

Dual stepper motor driver
- STEP/DIR interface
- Up to 1/256 micro-stepping indexer
4.5V to 38V operating supply voltage range
900mΩ HS + LS R_DS(ON) at 24V, 25°C
1.5A full-scale, 1.1A rms current per H-bridge
Integrated current sense functionality
- No sense resistors required
±5% full-scale current accuracy
Smart tune decay technology

Configurable off-time PWM chopping in Smart tune
- 8µs, 16µs, or 32µs
Supports 1.8V, 3.3V, 5.0V logic inputs
Low-current sleep mode (1.3µA)
Protection features for each stepper
- VM undervoltage lockout (UVLO)
- Charge pump undervoltage (CPUV)
- Overcurrent protection (OCP)
- Thermal shutdown (OTSD)
- Fault condition output (nFAULT)