MIC4452CT

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Power management integrated circuits (PMICs) have become increasingly important across the whole of industry. They are designed to control, integrate and regulate power to real world loads from low to high power, from a single power supply or from multiple sources. One important subclass of PMICs is gate drivers, which are used to control transistors in order to switch them on and off in response to a stimulus or control signal. Using gate drivers, engineers can more accurately and reliably control the power supply to their devices. The MIC4452CT is one such gate driver. It has a range of applications and a specific working principle which make it suitable for use in a wide range of industrial applications.

Applications

The MIC4452CT is a non-inverting, low-side MOSFET driver used in power management circuits. It can be used in a range of traditional low-side and high-side switch block topologies, as well as in H-Bridge designs. It achieves this versatility by providing two output channels; one to control a low-side MOSFET and one to control a high-side MOSFET. This allows it to switch on and off both the source and the drain of a MOSFET. The MIC4452CT is suitable for use in applications where power control or switching is required for DC/DC converters, inverters, lighting, and motor drives.

Working Principle

The MIC4452CT uses an N-channel MOSFET to drive both the low-side and high-side MOSFETs. The gate of the low-side MOSFET is driven by an internal PMOS transistor, while the gate of the high-side MOSFET is driven by an internal p-channel MOSFET. The MIC4452CT is capable of delivering a peak output current of up to 55mA, and it is capable of sinking up to 175mA when used in sink-mode. The MIC4452CT is controlled by two logic signals; one for the low-side MOSFET and one for the high-side MOSFET. The logic signals are latched to ensure that the corresponding MOSFET is switched on and off accurately.

Overcurrent Protection

The MIC4452CT also features several protection mechanisms for both the low-side and high-side MOSFETs. These include over- current protection (OCP), overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown (TSD). The OCP ensures that the low-side and high-side MOSFETs do not experience excessive currents, while the OVP ensures that the drain to source voltage remains below a pre-defined maximum. The UVLO ensures that the gate voltage remains above a pre-defined minimum, while the TSD ensures that the die temperature remains below the pre-defined maximum.

Conclusion

The MIC4452CT is an ideal gate driver for use in applications where a low-side and high-side MOSFETs need to be driven with a peak output current of up to 55mA, and a sink current of up to 175mA. It is suitable for use in DC/DC converters, inverters, lighting, and motor drives, and it benefits from a range of safety features to protect the low-side and high-side MOSFETs from overcurrent and overvoltage conditions. It is further enhanced by its capability to be used in a range of traditional low-side and high-side switch block topologies, as well as in H-Bridge designs.

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