A6862KT Three-Phase Isolator MOSFET Driver IC – Safety-Critical Driver for Electric Power Steering & Braking Systems
The A6862KT is a dedicated N-channel power MOSFET driver engineered specifically for isolating three-phase loads in automotive safety-critical systems.
This driver IC is designed to control MOSFETs configured as a three-phase solid-state relay in phase-isolation applications, providing a reliable alternative to traditional electromechanical relays .
It features three independent floating gate drive outputs that maintain power MOSFETs in the on-state across the full supply range, even under high phase-voltage slew rate conditions .
An integrated charge pump regulator delivers the above-battery voltage necessary to keep the MOSFETs continuously on when the phase voltage equals battery voltage .
The charge pump maintains sufficient gate drive exceeding 7.5 V for supply voltages as low as 4.5 V with 100 kΩ gate-source resistors, ensuring reliable operation under low-battery conditions .
The gate drives can be controlled through a single logic-level input, simplifying system integration and reducing microcontroller I/O requirements .
Two independent activation inputs are provided to place the device into a low-power sleep mode with the charge pump disabled, minimizing quiescent current draw during standby .
The device operates from a wide 4.5 V to 50 V supply voltage range, making it suitable for both 12V and 24V automotive electrical systems .
Comprehensive undervoltage monitors verify that both the pumped supply voltage and gate drive outputs remain sufficiently high to ensure safe MOSFET conduction states .
In typical applications, the MOSFETs switch on within 8 µs and switch off within 1 µs, enabling fast and responsive load disconnection .
The A6862KT is particularly suited for electric power steering systems, electric braking, and three-phase solid-state relay driver applications where ASIL compliance is required .
Housed in a compact 16-lead TSSOP package with an exposed pad for enhanced thermal dissipation, it enables space-efficient designs in dense automotive PCB layouts .