MIC4428BN

Overview

The MIC4428BN is a dual low-side MOSFET driver manufactured by Microchip Technology, formerly Micrel Semiconductor. It features two independent channels capable of sourcing and sinking 1.5 A peak current. The device operates with input voltages from 4.5 V to 18 V and supports supply voltages up to 18 V. It includes both inverting and non-inverting outputs for flexible control configurations. The component is housed in an 8-pin PDIP package and is designed for high-efficiency switching applications.

Feature Summary

• Dual channel architecture providing independent control for two low-side MOSFETs
• High peak output current capability of 1.5 A for rapid gate charging
• Integrated inverting and non-inverting logic inputs for versatile signal compatibility
• BiCMOS/DMOS fabrication process ensuring low power consumption and high reliability

Applications

• Low-side switching in DC-DC converter topologies
• Motor control circuits requiring independent phase drive
• Power management systems utilizing external N-channel MOSFETs
• Industrial automation equipment with high-current load driving needs

Procurement Notes

Verify part status carefully as the MIC4428BN is listed as obsolete by the manufacturer. Confirm availability through authorized distributors or secondary market suppliers like Rochester Electronics. Ensure substitute components such as the MIC4428YN are evaluated for pin compatibility and electrical specifications before integration into existing designs.

Selection Notes

Select this component when dual independent low-side drive is required with moderate current demands. The 1.5 A peak current suits most standard power MOSFETs. Consider the PDIP package for prototyping or through-hole assembly requirements. Evaluate thermal performance if operating near maximum voltage limits, as power dissipation increases with higher supply voltages and switching frequencies.

Part Context

This device belongs to the MIC4426/4427/4428 family of dual low-side drivers. These components share similar BiCMOS/DMOS technology for efficiency. The MIC4428BN specifically offers dual channels with distinct inverting and non-inverting outputs, differentiating it from single-channel variants or those with identical polarity outputs within the same series.

Replacement Considerations

The MIC4428YN is identified as a direct substitute. Verify that the YN suffix variant maintains identical pinout and electrical characteristics. Check for any changes in packaging or RoHS compliance status when transitioning from the obsolete BN version to available alternatives.