MIC4427YN

The MIC4427YN is a power management integrated circuit (PMIC) – gate driver unit from Micrel Corporation, a leading semiconductor company specialising in analog, mixed-signal, and power sharing systems. It is a low-power supply and monolithic, high-speed MOSFET gate driver integrated circuit. The IC combines logic functions with power MOSFETs and bipolar output stages for driving power MOSFETs and IGBTs in a number of applications.

The MIC4427YN is designed to be an intelligent gate driver integrated circuit (IGD) providing gate control and protection functions, as well as buffering functions, in a single IC. The IC features programmable over-current protection, drive strength control, over-voltage protection, temperature monitoring and fault reporting. The package incorporates two outputs and provides over-temperature and under-voltage detection and protection.

The MIC4427YN is suitable for use in a variety of application fields, such as Blu-ray DVD players, LCD monitors, television screens, personal computers, servers, motor control and timing applications. Its wide operating temperature range of 0°C to 65°C, small footprint and high speed performance make it a preferred choice for many designs.

The MIC4427YN is designed with high voltage tolerance, thermal and supply noise immunity and low leakage current. The main features of the IC include output enable/disable control, software selectable drive strength control, adjustable over-voltage protection and over-temperature alert monitoring. It is based on the patented IC engine technology developed by Micrel that provides high speed response with no dead time.

The working principle of the MIC4429YN is based on its unique logic circuit that detects overshoot and under shoot currents and adjusts the output drive current accordingly. It also monitors VGS voltage and adjusts the output drive current as required, which allows efficient and reliable operation of the MOSFETs and IGBTs. The internal logic circuit is also capable of detecting open-loop faults and other localized faults. The IC also includes output-enable/disable control and output-on control.

Other features of the MIC4427YN include built-in voltage and current monitors, over-temperature protection and self-regulating current limiting. The optional over-current protection helps to reduce stress on the power system, while the optional over-voltage protection ensures that over-voltage events do not occur. The IC is available in a small 6 x 6 mm package with a 0.5mm pitch.

In summary, the MIC4427YN is a low-power supply and monolithic, high-speed MOSFET gate driver intended for use in a variety of application fields. It features low noise, wide operating temperature range, small size and high speed performance. It also provides over-current protection, drive strength control, over-voltage protection, temperature monitoring and fault reporting.