The Pololu High-Power Motor Driver 18v25 is a high-performance, flexible motor driver designed to drive large and high-power stepper motors and brushless DC motors up to 18V and 25A per channel. It can operate from 6.5V to 36V, and is efficient enough to deliver a continuous 25 A per channel without a heat sink, making it an ideal choice for many types of high-power motor applications. The driver offers adjustable current limiting, over-temperature thermal shutdown, and 5V, 1A startup output to power servos or sensors. The driver is also equipped with a USB connector, which can be connected to a computer or host controller, allowing smooth and accurate control of the motor speed. The driver includes a power-on reset circuit to protect against brief power glitches and is built on robust, low-RDS(on) MOSFETS with a typical resistance of 0.02 Ohm for reliable operation.