MIC4451ZT

Overview

The MIC4451ZT is a low-side CMOS inverting MOSFET driver manufactured by Microchip Technology. It delivers a peak output current of 12A and operates within a supply voltage range of 4.5V to 18V. The device features a typical propagation delay of 30ns and matched rise/fall times of 25ns. It accepts logic inputs from 2.4V to VS, withstands negative input swings up to 5V, and has a low equivalent input capacitance of 7pF. The output impedance is typically 1.0Ω with a swing within 25mV of GND or VS. It is housed in a 5-pin TO-220 package.

Feature Summary

• Capable of driving large MOSFETs with a 12A peak output current for improved safe operating margin
• Input circuitry tolerates negative voltage swings up to 5V without damage
• Fully isolated BiCMOS/DMOS construction provides inherent latch-up immunity
• Accepts logic high inputs across the entire supply voltage range without external speed-up components

Applications

• Switch mode power supplies
• Motor controls
• Class-D switching amplifiers
• Driving MOSFET or IGBT parallel chip modules

Procurement Notes

Verify the specific suffix 'ZT' corresponds to the TO-220-5 tube packaging configuration as documented in official Microchip datasheets. Confirm that the component meets RoHS compliance standards indicated by the 'Z' designation. Ensure the operating temperature range aligns with the specified 0°C to 70°C commercial grade limits for your application environment.

Selection Notes

Select this component when a low-side inverting driver with high peak current capability is required. It is suitable for applications needing fast switching speeds with matched rise and fall times. Consider the TO-220 package for thermal management needs. Ensure the load does not exceed the 62,000pF capacitive drive limit. Verify that the input signal levels are compatible with the 2.4V to VS logic threshold.

Part Context

The MIC4451 is part of a family of tough, efficient CMOS MOSFET drivers originally developed by Micrel Semiconductor and now produced by Microchip Technology. It serves as the inverting counterpart to the non-inverting MIC4452. Both devices share similar electrical characteristics, including 12A peak output capability and wide operating ranges, designed to drive the largest MOSFETs efficiently.

Replacement Considerations

The MIC4452 is the non-inverting version of the same driver family and may be considered if inversion is not required. Other variants such as MIC4451BM or MIC4451BM-TR offer the same electrical performance but in different packages like SOIC. Verify pin compatibility and package dimensions before substitution.