A4919GETTR-5-T

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A4919GETTR-5-T Application Field and Working Principle

A4919GETTR-5-T, a highly integrated gate driver IC of the A4919 gate driver series from Allegro MicroSystems, is designed for general purpose power devices. The device is designed to drive high- and low-side N-channel MOSFETs, thus acting as a switch or synchronous rectifier in power designs, enabling buck, boost and polarity inversion capabilities. The A4919GETTR-5-T incorporates a wide range of integrated driver power, fault protection and fault indication features that enable the device to be used in a wide variety of applications, including DC/DC converters, motor control, and LED high power-factor LED light dimming.

The A4919GETTR-5-T is an automotive qualified part and is ideal for applications requiring isolated PWM, isolated synchronous and passive rectification. The device is designed to support a wide input voltage range from 3V to 16V, with a maximum load current of 5A. The A4919GETTR-5-T requires only 2.5V voltage for proper operation and can be directly driven by 3.3V and 5V logic controllers, allowing the device to be used in a variety of automotive and consumer applications. The device also features a rugged, dual channel driver with maximum channel-to-channel cross-conductance of 250mΩ, and can support a wide range of current levels up to 5A.

Working principle

The A4919GETTR-5-T’s gate driver uses a dual-channel totem-pole output stage architecture, which enables it to simultaneously drive two FETs in single, parallel and half-bridge configurations. The device includes internal charge pump, short-circuit current limit and over-voltage protection circuits to protect the external circuitry and the FETs from over-voltage and over-current conditions. The device also incorporates a slew rate control circuit which allows the user to set the rising and falling edge rates of the output pulses to match the required application.

The A4919GETTR-5-T gate driver’s floating output can be driven internally or externally, allowing the user to use either traditional or improved bootstrap techniques. To further optimize the operating performance of the device, the user can program the output voltage levels, rise and fall times, and deadtimes, depending on the requirements of the application. Additionally, the device includes several fault protection and fault indication features, such as under-voltage lockout, output short-circuit protection, over-voltage protection and open-load sense.

The A4919GETTR-5-T device is a versatile and robust gate driver IC which can be used to efficiently control high- and low-side FETs in a variety of industrial, consumer, automotive and power design applications. The device’s feature set and functional safety capabilities make it an ideal solution for applications requiring robust, high-efficiency and reliable power control.

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