A3944 Datasheet | Allegro MicroSystems

Automotive Low-Side FET Pre-Driver Features AND BENEFITS - 6 channels - Drives logic-level N-channel MOSFETs - 40 m A gate drive current - Short and open detection - High-voltage (50 V) drain feedback inputs - Programmable fault timers and thresholds per channel - UVLO and thermal warning circuitry - Serial or parallel gate drive control - Highly configurable, through SPI-patible interface - pact TSSOP package APPLICATIONS: - Automotive ECU - Automotive high-side actuators PACKAGE: 28-pin TSSOP with exposed thermal pad (suffix LP) DESCRIPTION The A3944 is a programmable six-channel low-side MOSFET pre-driver suitable for use in automotive applications. Each channel is controllable by a bination of parallel and serial inputs and provides sufficient gate drive current to allow PWM control up to 20 k Hz, depending on the MOSFET gate charge. Each channel provides independent fault diagnostics for shortto-ground and open load when in the off-state, and short-tobattery when in the on-state. A short-to-battery can disable the output until reset or for a programmable retry time. Each channel provides independently programmable fault thresholds and blanking times. In addition to channel state control, channel fault masking, fault thresholds and fault timers are programmed through the SPI patible serial interface. The serial interface also provides read back of the fault status for each channel. Digital inputs and outputs are patible with 3.3 V and 5 V supplies. The A3944 is supplied in a 28 lead TSSOP package (suffix LP) with an exposed thermal pad. The package is lead (Pb) free with 100% matte-tin leadframe plating. Not to scale Typical Application Diagram Parallel Controller A3944-DS, Rev. 8 MCO-0000664 August 8,...