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Anti-shoot through incorporated in half-bridge MOSFET driver

10 Jan 2014

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A half-bridge MOSFET driver called MIC4605 maximises system and power efficiency with its broad operating supply voltage and adaptive-dead-time circuitry. The 85V MOSFET driver also features shoot-through protection to prevent erroneous activation of the MOSFETs. Developed by Micrel, MIC4605 can be purchased for a minimum of $0.55 per 1,000 quantities in SOIC packaging.

MIC4605 is equipped with adaptive-dead-time circuitry that actively monitors the half bridge to reduce the time between high and low side MOSFET transitions, and in turn boost power efficiency. It allows only one MOSFET to be active at a time, thus assuring no cross conduction condition that can permanently destroy the Half Bridge circuit. The circuitry eliminates the need to design in dead-time margin and time delay between HI and LI inputs to protect against cross conduction reducing the headroom requirements of the microcontroller.

Anti-shoot-through circuitry prevents erroneous inputs and noise from turning both MOSFETs on at the same time. The MIC4605 also offers operating supply ranging from 5.5V to 16V to maximise system efficiency. The low 5.5V operating voltage allows longer run times in battery powered applications. These features make the MIC4605 an ideal solution for power tools, power DC/AC inverters and other battery operated motor applications.

The 85V operating voltage offers plenty of margin as protection against voltage spikes, which are present in motor drive and power supply applications. This makes the MIC4605 suitable for low voltage and high voltage applications.

The MIC4605 features fast 30ns propagation delay times and 35ns driver rise/fall times for a 1nF capacitive load. For MIC4605 -1, TTL inputs provide independent control of the low-side and high-side gate drivers. The MIC4605 -2 has a single PWM input for both low-side and high-side gate drivers. The outputs do not overlap in either mode. An internal, high-voltage Schottky diode charges the high-side, gate-drive bootstrap (external) capacitor. The MIC4605 is available in an 8-pin SOIC package and a tiny 10-pin 2.5mm × 2.5mm TDFN package. Both packages have an operating junction temperature range of -40℃ to +125℃.

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