MIC4451YM-TR Integrated Circuits (ICs)

Logic Voltage - VIL, VIH:	0.8V, 2.4V
Base Part Number:	MIC4451
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Rise / Fall Time (Typ):	20ns, 24ns
Input Type:	Inverting
Current - Peak Output (Source, Sink):	12A, 12A
Series:	--
Voltage - Supply:	4.5 V ~ 18 V
Gate Type:	IGBT, N-Channel MOSFET
Number of Drivers:	1
Channel Type:	Single
Driven Configuration:	Low-Side
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MIC4451YM-TR is a gate driver IC for power MOSFETS and IGBTs that uses a low-voltage logic level to control the high voltage and high current needed to deploy power switches. This power IC from Micrel, Inc. is part of the Power Management Integrated Circuits (PMIC) product family, more specifically related to Gate Drivers, and it offers a low on-resistance and high speed performance with its integrated level shifter, which adds an extra layer of protection to the IC during power switches operations.

Application

The MIC4451YM-TR is ideal for use in switching power supplies, motor drives, power inverters, automotive systems and other electronic devices that require high switching speed and low loss, including:

• AC/DC converters.
• DC/DC converters.
• HVP (High Voltage Power Supplies).
• Power Ferrites.
• Inductors.

Thanks to its high-speed switching, it can also be used for RF devices, cellular and wireless base stations, radio frequency amplifier, power amplifiers and antennas.

Features

The MIC4451YM-TR offers several important features that make it a suitable product for switching applications, such as:

• Very low 210mΩ on-resistance at 4.5V and 5A.
• High peak output current capability of 11A.
• High speed switching with switching times from 10-25 nsec.
• Integrated logic level shifter with an output voltage range of 1V-33V.
• 3-channel driver with separate trim pots for each channel.
• Short circuit protection circuit.
• Thermal shutdown protection.
• Compact form factor of 5mm x 7mm.
• Operating temperature of -40 to +125 °C.

Pin Configuration

The MIC4451YM-TR\'s is composed of 18 pins, as shown in Figure 1.

Figure 1 – Pin Configuration of the MIC4451YM-TR.The pins are configured as:

• 8 logic pins (+/- Input, 1 +/- CLK, GND, and Output).
• 3 voltage pins (VIN1, VIN2, and VOUT).
• 3 power pins (VCC, GND, and FGND).
• 4 output pins (OUTP and OUTN for each channel).

Working Principle

The MIC4451YM-TR has a built-in level shifter which raises and lowers the logic level output pins, allowing the IC to drive higher voltage load circuits more efficiently. The logic level from the logic pins is converted to the appropriate high voltage level through the level shifter and then applied to the output pins (i.e.: OUTP and OUTN).The logic level on the logic pins is either high (>3.5V) or low (<1.5V). When the logic pins are low (i.e. OFF) the gate of the power switch is turned off and the circuit is disconnected, while when the logic pins are high (i.e. ON) the gate of the power switch is activated and the circuit is connected.The MIC4451YM-TR has a short circuit protection circuit, which short circuits the output when the output voltage is greater than the supply voltage, preventing potential damage to the IC.In addition, it has an integrated thermal shutdown protection circuit, which protects the IC from over-temperature conditions by shutting off the output if the temperature rises above a certain threshold.

Conclusion

The MIC4451YM-TR is a power management IC from Micrel, Inc. that is part of PMIC Gate Drivers family. It offers a low on-resistance and high speed performance with its integrated level shifter, which adds an extra layer of protection to the IC during power switches operations. Additionally, it has short circuit and thermal shutdown protection to protect it from damage during operation. It is ideal for use in high voltage and speed applications such as motor drives, power inverters and power ferrites. Moreover, its small dimensions and operating temperature range makes it suitable for most industrial applications. Overall, the MIC4451YM-TR is a robust and powerful IC that provides the performance and reliability needed for switching applications.

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