MIC4421CN

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The MIC4421CN is a dual high- and low-side MOSFET gate driver set of the Power Management Integrated Circuit (PMIC) family. Parent company Microchip Technology’s product offering of well over 100 PMIC devices offers designers a highly integrated and cost-effective solution for interfacing power MOSFETs and IGBTs with microcontrollers, processors, FPGAs, and AC-DC, DC-DC, and other power-supply applications. The MIC4421CN gate driver is a member of the PMIC - Gate Driver family, designed to provide a cost-effective, high-performance alternative solution to the high-voltage, low-power gate drive designs commonly used in industrial and automotive power supply applications.

The MIC4421CN is a robust, isolated gate driver designed to drive high-side and low-side N-channel MOSFETs and IGBTs. It is specified with a maximum operating voltage of 8 V and a wide temperature range of -40° C to +150° C. The device features flexible logic inputs for high-side and low-side gate drive control, programmable dead-time settings, an adjustable output current limit, and self-protection against over-current and over-temperature conditions. The MIC4421CN also features a built-in EMC filter to minimize EMI emissions, further enhancing its design advantages. In addition, the device features integrated protection features such as under-voltage protection, over-current protection, and short circuit protection, as well as integrated slope compensation for low-latency turn-on and turn-off times.

The integrated circuit operates using three key elements: the logic inputs, the dead-time control, and the current limit settings. The logic inputs allow the designer to control the voltage applied to the power MOSFET or IGBT drain and source terminals. The MIC4421CN has two sets of logic inputs, one for the high-side power MOSFET or IGBT and one for the low-side power MOSFET or IGBT. The MIC4421CN provides flexibility in configuring the logic inputs by allowing the designer to configure them as active high or active low.

The dead-time settings available in the MIC4421CN are used to ensure that the low-side and high-side devices are never on at the same time, a necessary operation for proper power MOSFET or IGBT operation. The MIC4421CN allows for a programmable dead-time of 500ns-6µs (microns). The current limit settings available in the MIC4421CN are adjustable from 0-146 mA and can be set to limit the total peak output current. The ability to set the current limit eliminates the need for an external current sensing resistor and enhances the gate-drive robustness.

The MIC4421CN also provides an integrated EMC filter to reduce conducted EMI and enhance the design robustness. The filter is enabled by the internal dead-time control logic and includes frequency-dependent bypass capacitors and induction coils. Finally, the integrated slope compensation minimizes turn-on and turn-off delays and provides full control over timing. The MIC4421CN is ideal for use in applications requiring a low-input, low-power gate-driven solution.

The MIC4421CN is an excellent choice for power MOSFET and IGBT gate-driving solutions, particularly in industrial and automotive applications. Its wide operating temperature range and flexible logic inputs, along with its integrated protection features, make the device suitable for a variety of different applications. In addition, its integrated EMC filter and programmed dead-time settings reduce the design complexity, resulting in a cost-effective, efficient gate-driver solution.

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