MC33887PFK 5A H-Bridge DC Motor Driver IC – Load Current Feedback for Automotive ECU Actuators
The MC33887PFK is a monolithic H-Bridge power integrated circuit specifically designed for closed-loop DC motor control in demanding automotive environments. This fully integrated driver combines control logic, charge pump, gate drive, and low on-resistance MOSFET output circuitry into a single compact package, making it an ideal replacement for failed driver stages in throttle control modules, electronic valve actuators, and other motor control units within Engine Control Units (ECUs).
Power Stage & Current Capability:
The device is capable of delivering continuous DC load currents up to 5.0 A, with peak current active limiting between 5.2 A and 7.8 A to protect the motor and driver during stall or overload conditions. It operates across a wide supply voltage range from 5.0 V to 28 V, with limited operation up to 40 V, covering both 12 V and 24 V automotive electrical systems. The H-Bridge MOSFETs feature a low typical on-resistance of 120 mΩ, ensuring high efficiency and minimal power dissipation during extended operation .
Load Current Feedback & Control:
A key feature of this driver is its load current feedback capability, which provides a proportional constant-current output (1/375th of the load current) suitable for monitoring by a microcontroller's A/D input. This facilitates the design of closed-loop torque and speed control, as well as open-load detection. The device supports Pulse Width Modulation (PWM) operation at frequencies up to 10 kHz, enabling precise motor speed and position control strategies .
Protection & Diagnostic Features:
The MC33887PFK includes comprehensive protection mechanisms to ensure system reliability in harsh automotive conditions. A Fault Status output pin reports undervoltage, short circuit, and overtemperature conditions to the main microcontroller. Two independent inputs provide polarity control of the two half-bridge totem-pole outputs, while two disable inputs can force the H-Bridge outputs to a high-impedance tri-state. The device also features a low-power Sleep Mode with a current draw of less than 50 μA, preserving battery life when the engine is off .
Package & Environmental Durability:
This driver IC is housed in a compact 36-PowerQFN (9x9 mm) surface-mount package, suitable for space-constrained ECU designs. It is AEC-Q100 qualified and operates reliably across an automotive temperature range of -40°C to +125°C (junction temperature up to 150°C), ensuring stable performance in engine compartment environments .
Repair & Replacement Value:
For ECU repair technicians and automotive workshops, the MC33887PFK offers a direct drop-in replacement for failed H-Bridge motor driver stages. Replacing this component can restore throttle, valve, or other motor control functionality without the need for an expensive full ECU replacement, providing a cost-effective repair solution.