MIC4423BM

Overview

The MIC4423BM is a high-speed, dual MOSFET driver manufactured by Microchip Technology. It integrates two independent channels designed to drive power MOSFETs and IGBTs with enhanced performance. The device features active Miller clamp functionality to prevent false turn-on during high dv/dt switching events. It operates from a supply voltage range of 4.5V to 18V. The output stage provides peak currents of 2A source and 4A sink per channel. The BM suffix indicates a military temperature grade range of -55°C to +125°C. It is housed in an 8-pin SOIC package.

Feature Summary

• Integrates active Miller clamp circuitry to suppress gate voltage spikes caused by parasitic capacitance coupling during fast switching transitions.
• Provides asymmetric output drive capabilities with higher sink current than source current for optimized turn-off speed.
• Features short-circuit protection within the output stage to safeguard against load faults.
• Operates reliably across extended military temperature ranges without degradation in switching performance.

Applications

• High-frequency motor control systems requiring robust gate driving.
• Industrial inverters and converters utilizing IGBT or MOSFET topologies.
• Power supplies demanding precise switching timing and noise immunity.

Procurement Notes

Verify the specific suffix 'BM' confirms the military temperature grade and quality level required for your application. Ensure the package type matches your PCB footprint specifications. Confirm that the manufacturer's datasheet revision aligns with your design documentation requirements before finalizing procurement orders.

Selection Notes

Select this component when asymmetric drive strength is beneficial for faster turn-off times compared to symmetric drivers. Consider the active Miller clamp feature if the application involves high dv/dt environments prone to shoot-through risks. Evaluate the operating voltage range against the logic levels available in the control system to ensure compatibility.

Part Context

This part belongs to the MIC44xx series of dual MOSFET drivers. It shares architectural similarities with other members but differs in drive strength and temperature grading. The MIC4423 variant specifically targets applications needing moderate source current and higher sink current capabilities within a compact dual-channel configuration.

Replacement Considerations

• MIC4423YM

FAQ

What is the function of the active Miller clamp?

It actively pulls down the gate voltage to prevent unintended turn-on of the MOSFET due to capacitive coupling from the drain-source voltage transition.

How does the sink current compare to the source current?

The sink current is 4A while the source current is 2A, allowing for faster discharge of the gate charge during turn-off.