MIC4421ACN

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The MIC4421ACN has been designed and introduced by Micrel Incorporated as an advanced power management IC for related applications due to its features such as an independent auxiliary supply (up to 65V) and a low input/output impedance resulting from a high drive current capability. In other words, this device is a combination of three systems, a voltage regulation system, a protection system, and a high speed switching system, providing various benefits to the user. This IC is classified as PMIC – Gate Drivers.

The primary purpose of the MIC4421ACN is to provide high speed switching and drive capability in a wide assortment of applications. This IC has found its place in notably in insulated gate bipolar transistors (IGBTs), MOSFETs, and motor control systems. This device was created specifically with the aim at providing an enhanced level of protection in case of unpredictable supply disconnection. Furthermore, the independent supply makes the IC especially useful in controlling the speed of motors or switching large capacitive loads.

The MIC4421ACN is a two-channel high-side gate driver with a robust protection system. The control section is internally equipped with OVP, OCP, and thermal protection circuits. It provides over-voltage and over-current protection as well as thermal shut down, making this IC suitable for a wide range of uses such as motor control and power supply applications. Just as the earlier mentioned features, the MIC4421ACN also features a low input/output impedance resulting from a high drive current capability. The output can drive with a peak current up to 30A.

The MIC4421ACN is available in an 8-pin SO package and operates over an extended temperature range of –40°C to 125°C. The IC also meets the requirements of various safety standards such as CSA and EN60950. The SW, ASSY, and UART pins are all connected internally, making the connection easy, while the auxiliary input can be connected anywhere on the board.

The switching principle of the MIC4421ACN is based on the selectable non-overlapping gate driver (SONG) architecture. This is a three-stage, non-overlapping gate driver that provides synchronized control from power supply to control supply. The IC is designed to reduce the switching losses and improves the overall device reliability; it is also enabled for quick and easy fault diagnosis in case of an unexpected behavior. The SONG architecture is designed to reduce the turn-off transistor’s voltage stress, allowing for greater flexibility of the design.

This advanced IC also features an independent bias supply that can support up to 65V. This allows for a constant current limiting, regardless of the operating voltage, avoiding over-current conditions. The IC also has an integrated Active Discharge (AD) circuitry, which reduces the floating power dissipation in the turned-off state, leading to a reduction in power losses in the overall system.

In conclusion, the MIC4421ACN has been designed as an advanced power management IC for related applications, and it is classified as PMIC - Gate Drivers. This two-channel high-side gate switching system provides various protections such as over-voltage, over-current, and thermal protection. It also features integrated active discharge circuitry and embedded SONG architecture, making it suitable for a wide range of applications.

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