DRV8434A

• PWM Microstepping Stepper Motor Driver
  • Simple STEP/DIR Interface
  • Up to 1/256 Microstepping Indexer
• Integrated Current Sense Functionality
  • No Sense Resistors Required
  • ±4% Full-Scale Current Accuracy
• Smart tune ripple control decay

• Stall Detection using GPIO pins

• 4.5 to 48-V Operating Supply Voltage Range
• Low R_DS(ON): 330 mΩ HS + LS at 24 V, 25°C
• High Current Capacity: 2.5 A Full-Scale, 1.8 A rms
• Supports 1.8 V, 3.3 V, 5.0 V Logic Inputs
• Low-Current Sleep Mode (2 µA)
• Spread spectrum clocking for low EMI

• Small Package and Footprint

• Protection Features
  • VM Undervoltage Lockout (UVLO)
  • Charge Pump Undervoltage (CPUV)
  • Overcurrent Protection (OCP)
  • Sensorless stall detection
  • Open Load Detection (OL)
  • Thermal Shutdown (OTSD)
  • Fault Condition Output (nFAULT)

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The DRV8434A is a stepper motor driver for industrial and consumer applications. The device is fully integrated with two N-channel power MOSFET H-bridge drivers, a microstepping indexer, and integrated current sensing. The DRV8434A is capable of driving up to 2.5 A full-scale output current (dependent on PCB thermal design).

The DRV8434A uses an internal current sense architecture to eliminate the need for two external power sense resistors, saving PCB area and system cost. The device uses an internal PWM current regulation scheme with smart tune ripple control decay. Smart tune automatically adjusts for optimal current regulation, compensates for motor variation and aging effects and reduces audible noise from the motor.

A simple STEP/DIR interface allows an external controller to manage the direction and step rate of the stepper motor. The device can be configured in full-step to 1/256 microstepping. A low-power sleep mode is provided using a dedicated nSLEEP pin.

The DRV8434A features advanced stall detection algorithm configurable by two digital IO and one analog IO pins, and does not require an SPI interface to detect stall. By detecting motor stall, system designers can identify if the motor was obstructed and take action as needed which can improve efficiency, prevent damage and reduce audible noise. Other protection features include supply undervoltage, charge pump faults, overcurrent, short circuits, open load, and overtemperature. Fault conditions are indicated by the nFAULT pin.