Pololu 1457 High-Power Motor Driver 36v20 CS
Pololu 1457 High-Power Motor Driver 36v20 CS
Pololu 1457 High-Power Motor Driver 36v20 CS
The Pololu 1457 is a high-performance brushed DC motor driver capable of delivering up to 20 amperes continuous current at voltages up to 36V, making it ideal for controlling large industrial and robotic motors with precision. Professional engineers and roboticists rely on this driver for applications requiring robust motor control with integrated current sensing and thermal management. This driver solves the critical challenge of safely controlling high-power motors in autonomous systems, industrial automation, and mobile robotics where standard microcontroller outputs cannot directly drive heavy inductive loads.
Product Overview
The Pololu 1457 High-Power Motor Driver 36v20 CS utilizes a full H-bridge topology with integrated MOSFETs to provide bidirectional motor control with exceptional efficiency and reliability. The driver accepts PWM signals from microcontrollers and translates them into high-current motor commands, featuring integrated current sensing via a 0.05-ohm sense resistor that allows real-time motor current monitoring through an analog feedback pin. The CS (Current Sensing) variant provides a proportional voltage output corresponding to motor current draw, enabling closed-loop control systems and overcurrent protection implementation at the application level.
What distinguishes the 1457 from competing solutions is its combination of high voltage tolerance, substantial current capacity, compact form factor, and built-in protection features including reverse polarity protection and thermal shutdown. The driver operates efficiently across the entire 5.5V to 36V input range, with low on-resistance MOSFETs minimizing heat dissipation and extending operational lifespan. The integrated freewheeling diodes eliminate the need for external protection diodes, simplifying circuit design while the current sensing pin provides real-time diagnostics for predictive maintenance and fault detection in mission-critical applications.
Key Specifications
| Specification | Details |
| Product Type | Brushed DC Motor Driver with Current Sensing |
| Brand | Pololu Robotics and Electronics |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Maximum Continuous Current | 20 Amperes |
| Peak Current Rating | 30 Amperes (for 5 seconds) |
| Operating Voltage Range | 5.5V to 36V DC |
| Control Signal | PWM or analog voltage (0V to 5V logic compatible) |
| Current Sensing Output | 0.05 ohm sense resistor with proportional voltage output |
| Dimensions | 2.4 x 2.0 inches (61 x 51 mm) |
Key Features
- Integrated current sensing with 0.05-ohm precision sense resistor enabling real-time motor current monitoring and closed-loop control implementation
- Full H-bridge topology supporting bidirectional motor control with independent PWM frequency capability up to 20 kHz for smooth operation
- Reverse polarity protection and thermal shutdown at 165 degrees Celsius preventing catastrophic failure from power supply misconnection
- Low on-resistance MOSFETs with integrated freewheeling diodes minimizing heat dissipation and eliminating need for external protection components
- Wide voltage compatibility from 5.5V to 36V supporting diverse motor types and power supply configurations
- Compact PCB design with through-hole connectors suitable for breadboard prototyping and permanent installations
Applications and Use Cases
- Autonomous mobile robots and wheeled platforms requiring independent motor control with current feedback for traction management and obstacle detection
- Industrial automation systems controlling conveyor belts, hydraulic pump motors, and heavy machinery with real-time current monitoring for predictive maintenance
- Robotic arms and manipulators where precise motor control and load sensing are critical for safe human-robot collaboration
- Electric vehicle propulsion systems and golf cart motor controllers requiring high-current DC motor management with thermal protection
- Drone landing gear actuators and gimbal stabilization systems benefiting from current sensing for load compensation
- Laboratory test equipment and custom instrumentation requiring programmable motor control with embedded diagnostics
How to Use
Connect the Pololu 1457 by supplying power through the motor supply pins (supporting 5.5V to 36V), then connect your DC motor leads to the motor output terminals ensuring correct polarity for desired rotation direction. Interface the control signals by connecting PWM output from your microcontroller (Arduino, Raspberry Pi, STM32) to the PWM input pin, and optionally connect the current sensing output pin to an analog input for real-time motor current monitoring. The driver requires proper heatsinking for continuous operation above 15 amperes; mount on aluminum or copper substrate with thermal compound for optimal heat dissipation.
For closed-loop applications, read the current sensing pin voltage (typically 0V at zero current, scaling proportionally to motor current draw) and implement feedback algorithms in your microcontroller firmware. The sense resistor voltage relationship is approximately 50 millivolts per ampere, allowing straightforward current calculation. Always verify motor rotation direction before load application, and implement software current limits to protect both the driver and motor from overcurrent conditions exceeding the 30-ampere peak rating.
Frequently Asked Questions
What is the maximum continuous current and peak current rating?
The Pololu 1457 safely delivers 20 amperes continuous current at standard operating temperatures with proper heatsinking. Peak current capacity reaches 30 amperes for short durations up to 5 seconds, useful for motor acceleration phases. Exceeding these ratings causes thermal shutdown protection to engage, temporarily disabling the driver until temperature normalizes.
How do I implement current limiting and overcurrent protection?
Monitor the current sensing output pin voltage in your microcontroller and implement firmware-based current limiting by reducing PWM duty cycle when current exceeds your threshold. The sense resistor produces approximately 50 millivolts per ampere, allowing direct current calculation via analog-to-digital conversion. This approach provides flexible, application-specific overcurrent protection without additional external components.
Can this driver control motors larger than 20 amperes?
The Pololu 1457 is rated for maximum 20 amperes continuous operation. For higher current requirements, consider parallel-connecting multiple drivers with current-sharing resistors, or upgrade to Pololu's higher-capacity options like the 1458 model. Exceeding specifications risks thermal damage and premature failure of internal MOSFETs.
What heatsinking is required for continuous operation?
For currents above 15 amperes, mount the driver on aluminum or copper substrate with thermal compound to dissipate heat effectively. A small aluminum plate (4x4 inches minimum) is typically sufficient for 20-ampere continuous operation in ambient temperatures below 40 degrees Celsius. Thermal shutdown engages at 165 degrees Celsius, protecting the driver from overheating.
Is this driver compatible with Arduino and Raspberry Pi?
Yes, the Pololu 1457 interfaces seamlessly with Arduino PWM outputs, Raspberry Pi GPIO pins, and any microcontroller providing 0-5V logic signals. The current sensing pin connects directly to analog inputs for real-time monitoring. Refer to Pololu's documentation and Arduino libraries for code examples and integration guidance.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Returns: 7-day return policy on manufacturing defects only
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