A6861 Datasheet | Allegro MicroSystems

Automotive 3-Phase Isolator MOSFET Driver Features AND BENEFITS - Three floating N-channel MOSFET drives - Maintains VGS with 100 kΩ gate-source resistors - Integrated charge pump controller - 4.5 to 50 V supply voltage operating range - Independent TTL input for each phase - 150°C ambient (165°C junction) continuous - A2-SIL™ product- device Features for safety-critical systems APPLICATIONS - Three-phase safety disconnect systems - Electric power steering (EPS) - Electric braking - Three-phase solid-state relay driver PACKAGE: 16-Lead TSSOP with exposed thermal pad (suffix LP) Not to scale. DESCRIPTION The A6861 is an N-channel power MOSFET driver capable of controlling MOSFETs connected as a three-phase solid-state relay in phase-isolation applications. The A6861 is intended for automotive systems that must meet ASIL requirements. In safety-critical applications, motor isolation is a critical safety requirement which is currently addressed with discrete circuitry or relays. Allegro A2-SIL™ products include specific Features that plement proper system design, allowing users to achieve up to ASIL D system rating. The A6861 has three independent floating gate drive outputs to maintain the power MOSFETs in the on state over the full supply range with high phase-voltage slew rates. An integrated charge pump regulator provides the above battery supply voltage necessary to maintain the power MOSFETs in the on state continuously when the phase voltage is equal to the battery voltage. The charge pump will maintain sufficient gate drive (>7.5 V) for battery voltages down to 4.5 V with 100 kΩ gate-source resistors. The three gate drives can be independently controlled by a logic level control input. In typical applications, the MOSFETs will be switched on within 8 µs and will switch off within 1 µs. Continued on the next page… 6861-DS, Rev. 9 MCO-0000284 Typical Application Diagram April 13, 2022 Automotive 3-Phase Isolator MOSFET Driver DESCRIPTION...