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The A4927 is an N-channel power MOSFET driver capable of controlling MOSFETs connected in a half-bridge arrangement and is specifically designed for automotive applications with high-power inductive loads, such as brush DC motors solenoids and actuators.
The A4927 is intended for automotive systems that must meet ASIL requirements. In common with other Allegro A2SIL™ products, this device incorporates features to complement proper system design, allowing users to achieve the required ASIL level.
A unique charge pump regulator provides full gate drive for battery voltages down to 5.5 V for most applications. A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs.
The half bridge can be controlled by independent logic-level inputs or through the SPI-compatible serial interface. The external power MOSFETs are protected from shoot-through by a programmable dead time.
Integrated diagnostics provide indication of multiple internal faults, system faults, and power bridge faults, and can be configured to protect the power MOSFETs under most shortcircuit conditions.
In addition to providing full access to the bridge control, the serial interface is also used to alter programmable settings such as dead time, VDS threshold, and fault blank time. Detailed diagnostic information can be read through the serial interface.
The A4927 is supplied in a 24-lead eTSSOP (suffix LP). This package is lead (Pb) free, with 100% matte tin leadframe plating (suffix –T).
Allegro’s A4927 is an ASIL-B product that has been developed in accordance to ISO26262 and contains features targeted for automotive safety applications. This product can be used in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation can be provided to support and guide the integration process.