Overview
The DRV8434S, produced by Texas Instruments, is a highly integrated stepper motor driver designed for industrial and consumer applications. This device features two N-channel power MOSFET H-bridge drivers, a microstepping indexer, and integrated current sensing. It is capable of driving up to 2.5-A full-scale output current, depending on the PCB design. The DRV8434S uses an internal current sense architecture, eliminating the need for external power sense resistors, which saves PCB area and reduces system cost. The device also includes advanced protection features such as supply undervoltage lockout, charge pump undervoltage, overcurrent protection, and thermal shutdown, ensuring reliable operation in various environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HTSSOP (PWP) | - |
| Pins | 28 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage Range | 4.5 to 48 | V |
| Full-Scale Output Current | Up to 2.5 A | A |
| RMS Output Current | Up to 1.8 A | A |
| Logic Input Voltage | 1.8 V, 3.3 V, 5.0 V | V |
| Microstepping Resolution | Up to 1/256 | - |
| On-Resistance (RDS(ON)) | 330 mΩ (HS + LS at 24 V, 25°C) | mΩ |
| Sleep Mode Current | 2 µA | µA |
Key Features
- PWM Microstepping Stepper Motor Driver with up to 1/256 microstepping resolution
- SPI Interface with STEP/DIR pins for external controller management
- Integrated Current Sense Functionality with no need for external sense resistors
- Smart tune, slow, and mixed decay options for PWM current regulation
- Low RDS(ON): 330 mΩ HS + LS at 24 V, 25°C
- 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
- Low-Current Sleep Mode (2 µA)
- Spread spectrum clocking for low EMI
- Protection Features: VM Undervoltage Lockout (UVLO), Charge Pump Undervoltage (CPUV), Overcurrent Protection (OCP), Open Load Detection (OL), Overtemperature Warning (OTW), Thermal Shutdown (OTSD), and Fault Condition Output (nFAULT)
- Daisy Chain support with SPI for up to 63 devices connected in series
Applications
- Printers and Scanners
- ATMs and Money Handling Machines
- Textile Machines
- Office and Home Automation
- Factory Automation and Robotics
- Major Home Appliances
- Vacuum, Humanoid, and Robotics
- Medical Applications
- 3D Printers
Q & A
- What is the maximum full-scale output current of the DRV8434S?
The DRV8434S can drive up to 2.5-A full-scale output current, dependent on PCB design.
- What is the operating supply voltage range of the DRV8434S?
The device operates within a supply voltage range of 4.5 to 48 V.
- What microstepping resolutions does the DRV8434S support?
The DRV8434S supports microstepping resolutions up to 1/256.
- Does the DRV8434S require external sense resistors for current sensing?
No, the DRV8434S uses an internal current sense architecture, eliminating the need for external power sense resistors.
- What protection features are included in the DRV8434S?
The device includes protection features such as VM undervoltage lockout, charge pump undervoltage, overcurrent protection, open load detection, overtemperature warning, thermal shutdown, and fault condition output.
- How does the DRV8434S manage sleep mode?
The DRV8434S has a low-power sleep mode that achieves an ultra-low quiescent current draw of 2 µA using the nSLEEP pin.
- What is the significance of the SPI interface in the DRV8434S?
The SPI interface allows for full duplex, 4-wire synchronous communication and supports daisy chaining up to 63 devices for configurability and detailed fault reporting.
- What are the typical applications of the DRV8434S?
The DRV8434S is used in applications such as printers and scanners, ATMs, textile machines, office and home automation, factory automation and robotics, major home appliances, and medical applications.
- How does the DRV8434S reduce audible noise from the motor?
The device uses smart tune technology, which automatically adjusts for optimal current regulation and reduces audible noise from the motor.
- What is the thermal performance of the DRV8434S?
The DRV8434S has a junction-to-ambient thermal resistance of 29.7 °C/W for the HTSSOP package and includes features like overtemperature warning and thermal shutdown to manage thermal performance.
