MC34931EK

The MC34931EK is a monolithic H-bridge Power IC designed for any low voltage DC servo motor control application within the current and voltage limits stated in this specification. This device is powered by SMARTMOS technology. The 34931 H-bridge is able to control inductive loads with currents up to 5.0A peak. Internal peak current limiting (regulation) is activated at load currents above 6.5 ±1.5A. Output loads can be pulse-width modulated PWMed at frequencies up to 20kHz. A load current feedback feature provides a proportional (0.24% of the load current) current output suitable for monitoring by a microcontrollers A/D input. A status flag output reports under-voltage, overcurrent 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).

• Overcurrent limiting (regulation) via internal constant-off-time PWM
• Output short-circuit protection (short to VPWR or GND)
• Temperature-dependant current-limit threshold reduction
• All inputs have an internal source/sink to define the default (floating input) states
• Automatic thermal back-off
• Real-time load current monitoring
• Design-in simplicity: Integrated H-bridge with charge pump, control, protection and four MOSFETs
• Operation up to 5A covering a wide range of applications
• Status flag output reports under-voltage, overcurrent and over-temperature fault conditions
• 3 and 5V TTL/CMOS logic compatible inputs
• <lt/>20µA Sleep mode with current draw
• 120mΩ RDS(ON) Typical high efficiency