Packaging information
| Package | Pins HTSSOP (PWP) | 28 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 2,500 | LARGE T&R |
Features for the DRV8434S
- PWM Microstepping Stepper Motor Driver
- SPI Interface with STEP/DIR pins
- Up to 1/256 Microstepping Indexer
- Integrated Current Sense Functionality
- No Sense Resistors Required
- ±4% Full-Scale Current Accuracy
- Smart tune, slow, and mixed decay options
- 4.5 to 48-V Operating Supply Voltage Range
- Low RDS(ON): 330 mΩ HS + LS at 24 V, 25°C
- High Current Capacity: 2.5 A Full-Scale, 1.8 A rms
- TRQ_DAC bits to scale full-scale current
- Configurable Off-Time PWM Chopping
- 7-µs, 16-µs, 24-µs, or 32-µs
- Supports 1.8 V, 3.3 V, 5.0 V Logic Inputs
- Daisy Chain support with SPI
- Low-Current Sleep Mode (2 µA)
- Spread spectrum clocking for low EMI
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Small Package and Footprint
- Protection Features
- VM Undervoltage Lockout (UVLO)
- Charge Pump Undervoltage (CPUV)
- Overcurrent Protection (OCP)
- Sensorless stall detection
- Open Load Detection (OL)
- Overtemperature Warning (OTW)
- Thermal Shutdown (OTSD)
- Fault Condition Output (nFAULT)
Description for the DRV8434S
The DRV8434S 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 DRV8434S is capable of driving up to 2.5-A full-scale output current (dependent on PCB design).
The DRV8434S 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 selectable between smart tune, slow and mixed decay options. Smart tune automatically adjusts for optimal current regulation and reduces audible noise from the motor.
A simple SPI interface with STEP/DIR pins 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. With advanced stall detection algorithm, designers can detect if the motor stopped and take action as needed. The device also includes an integrated torque DAC which allows scaling the output current through SPI without needing to scale the VREF reference. Other protection features are provided for supply undervoltage, charge pump faults, overcurrent, short circuits, open load, and overtemperature. Fault conditions are indicated by the nFAULT pin.
A low-power sleep mode is provided for very low standby current using an nSLEEP pin. The device features full duplex, 4-wire synchronous SPI communication, with daisy chain support for up to 63 devices connected in series, for configurability and detailed fault reporting.