MIC4451BN

Overview

The MIC4451BN is a low-side MOSFET gate driver manufactured by Microchip Technology, designed for efficient switching of power MOSFETs. It features a single inverting output capable of delivering a peak current of 12 A. The device operates within a supply voltage range of 4.5 V to 18 V and accepts logic inputs from 2.4 V to VS without external speed-up components. Key electrical parameters include rise and fall times of 25 ns, with maximum delay times of 80 ns. It functions reliably across an operating temperature range of -40°C to +85°C and is housed in an 8-pin PDIP package.

Feature Summary

• High peak output current capability of 12 A for driving large MOSFETs
• Inverting configuration with rail-to-rail CMOS/DMOS output swing
• Input protection against negative swings up to 5 V
• Latch-up proof construction using fully isolated BiCMOS/DMOS process

Applications

• Power supply circuits requiring high-speed MOSFET switching
• Motor control systems utilizing low-side drive configurations
• Industrial automation equipment needing robust gate drive solutions

Procurement Notes

Verify the specific suffix 'BN' corresponds to the PDIP-8 through-hole package variant when sourcing. Confirm that the required operating temperature range aligns with the standard -40°C to +85°C specification for this part number. Ensure compatibility with the 4.5 V to 18 V supply voltage limits during system design validation.

Selection Notes

Select the MIC4451BN for applications requiring an inverting low-side gate driver with high peak current output. This component is suitable where PCB space is less constrained than surface-mount alternatives, due to its through-hole packaging. Consider the 25 ns switching speed and 12 A drive strength for medium-frequency power conversion tasks.

Part Context

The MIC4451 belongs to the MIC4451/MIC4452 family of CMOS MOSFET drivers. While the MIC4451 provides an inverting output, the MIC4452 offers a non-inverting configuration. Both share similar performance characteristics, including 12 A peak output current and wide operating voltage ranges, allowing designers to choose based on logic signal requirements.

Replacement Considerations

MIC4451YM (SOIC-8 SMD variant)

FAQ

Does the MIC4451 require external speed-up capacitors?

No, the MIC4451 accepts any logic input from 2.4 V to VS without the need for external speed-up capacitors or resistor networks.

What is the maximum negative voltage the input can withstand?

Proprietary circuits allow the input to swing negative by as much as 5 V without damaging the part.