MIC4421BN

Overview

The MIC4421BN is a single-channel, low-side MOSFET gate driver manufactured by Microchip Technology. It utilizes a BiCMOS/DMOS process to deliver a peak output current of 9A. The device operates with an inverting configuration and accepts standard TTL or CMOS logic inputs. It supports a supply voltage range from 4.5V to 18V. The component is housed in an 8-pin PDIP package designed for through-hole mounting. It features matched rise and fall times of approximately 20ns and 24ns respectively, ensuring efficient switching performance for power MOSFETs.

Feature Summary

• Delivers high peak output current capability for rapid MOSFET switching
• Features inverting logic configuration compatible with standard digital interfaces
• Incorporates low cross-conduction current to minimize power dissipation
• Provides latch-up protection against reverse current conditions

Applications

• Driving power MOSFETs in DC-DC converter circuits
• Gate drive stages in motor control systems
• High-speed switching applications requiring fast edge rates

Procurement Notes

Verify the specific suffix 'BN' against official Microchip documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the PDIP-8 housing. Confirm that the inverting logic aligns with the system control signals. Check for RoHS compliance status if required by manufacturing standards.

Selection Notes

Select this component when a single low-side driver with 9A peak current is required. It is suitable for designs needing through-hole mounting options. Consider the inverting nature of the output relative to the input signal. Evaluate thermal requirements based on the specific load capacitance and switching frequency.

Part Context

This part belongs to the MIC4421/MIC4422 family of high-speed MOSFET drivers. These devices are designed to replace older bipolar drivers, offering faster switching speeds and lower power consumption. The family is widely used in industrial and consumer applications requiring reliable gate drive solutions for power switches.

Replacement Considerations

Direct pin-compatible replacements within the same family include the MIC4421BM (SOIC) or MIC4421AYN (PDIP). Verify that substitute parts maintain the 9A peak current rating and inverting configuration. Ensure the replacement package matches the board layout constraints.