A3944 Datasheet, PDF (1/31 Pages) Allegro MicroSystems – Automotive, Low-Side FET Pre-Driver

A3944
Automotive, Low-Side FET Pre-Driver
Features and Benefits
• 6 channels
• Drives logic-level N-channel MOSFETs
• 50 mA 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 compatible interface
• Compact 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 6 channel low-side MOSFET
pre-driver suitable for use in automotive applications. Each
channel is controllable by a combination of parallel and serial
inputs and provides sufficient gate drive current to allow
PWM control up to 10 kHz, depending on the MOSFET gate
charge.
Each channel provides independent fault diagnostics for short
to ground and open load when in the off-state, and short to
battery 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
compatible serial interface. The serial interface also provides
read back of the fault status for each channel.
Digital inputs and outputs are compatible 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
SPI
A3944-DS, Rev. 1