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Target Applications
• DC motor control
• DC brushed and servo motor
driver
• 3D printers
• Factory automation
• POS, ATM, vending kiosks
• Robotics
• Medical pumps and valves
• Ticketing, toll systems
Analog Solutions—Robust Reliable Performance
MC34931
5A H-bridge power integrated circuit
Overview
The MC34931 is a monolithic H-bridge power IC in a robust, thermally enhanced package, one
that provides ultra-low thermal resistance. Automatic thermal back-off ensures high availability
operation in demanding high-current, high-temperature industrial applications. It is designed
primarily for DC brushed and servo motor driver applications.
The MC34931 H-bridge is able to control inductive loads with currents up to 5.0 A peak. RMS
current capability is subject to the degree of heat sinking provided to the device package.
Internal peak-current limiting (regulation) is activated at load currents above 6.5 A ± 1.5 A. The
MCU can pulse width modulate the load through the MC34931 at frequencies up to 20 kHz. A
load current feedback feature provides a proportional (0.24% of the load current) current output
suitable for monitoring by a microcontroller’s A/D input. A status flag output reports under-
voltage, over-current and over-temperature fault conditions.
Two independent inputs provide polarity control of two half-bridge totem-pole outputs. The
disable inputs are provided to force the H-bridge outputs to tri-state (high-impedance off-state).
Simplified Applications Drawing
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