Pololu Dual MC33926 - Manual (Page 10)

Power Connections
Dual MC33926 motor driver shield power buses when connected to an
Arduino.
In the shield’s default state, the motor driver shield and Arduino are powered separately. When used this way, the
Arduino must be powered via USB, its power jack, or its VIN pin, and the shield must be supplied with 5 to 28 V
through the large VIN and GND pads on the right side of the board. Attempting to power the shield through other
means, such as from the Arduino or through the small VOUT pin, can permanently damage both the Arduino
and the shield (only the large power traces on the right side of the shield are designed to handle the high currents
involved in powering motors). A high-side reverse-voltage protection MOSFET prevents the shield from being
damaged if motor power is inadvertently connected backwards. Logic power, VDD, is automatically supplied by
the Arduino.
Pololu Dual MC33926 Motor Driver Shield User's Guide © 2001–2013 Pololu Corporation
3. Getting Started with an Arduino Page 10 of 24