A4927 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - Half-bridge MOSFET driver - Bootstrap gate drive for N-channel MOSFET bridge - Cross-conduction protection with adjustable dead time - Charge pump regulator for low supply voltage operation - 5.5 to 50 V supply voltage operating range - SPI-patible serial interface - Bridge control by direct logic inputs or serial interface - Programmable gate drive - Current sense amplifier - Programmable diagnostics - - A2SIL™ product- device features for safety-critical systems APPLICATIONS - Anti-lock braking systems (ABS) - HVAC (blower fan) - DC pumps (fuel, oil, water) - Solenoids and actuators - Similar industrial applications PACKAGE: 24-lead TSSOP with exposed pad (suffix LP) Not to scale DESCRIPTION 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 mon with other Allegro A2SIL™ products, this device incorporates features to plement 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-patible 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...