Quad High Side Switch (Quad 35mΩ)

The 33874 is one in a family of devices designed for low-voltage automotive and industrial lighting and motor control applications. Its four low RDS(ON) MOSFETs (four 35mΩ) can control the high sides of four separate resistive or inductive loads.

Programming, control, and diagnostics are accomplished using a 16-bit SPI interface. Additionally, each output has its own parallel input for pulse-width modulation (PWM) control if desired. The 33874 allows the user to program via the SPI the fault current trip levels and duration of acceptable lamp inrush or motor stall intervals. Such programmability allows tight control of fault currents and can protect wiring harnesses and circuit boards as well as loads.

The 33874 is packaged in a power-enhanced 12x 12 nonleaded Power QFN package with exposed tabs.

Features

• Quad 35mΩ high side switches (at 25°C)

• Operating voltage range of 6.0V to 27V with standby current < 5.0μA

• SPI control of over-current limit, over-current fault blanking time,

output OFF open load detection, output ON/OFF control,

watchdog timeout, slew rates, and fault status reporting

• SPI status reporting of over-current, open and shorted loads,

over-temperature, under-voltage and over-voltage shutdown,

fail-safe pin status, and program status

• Analog current feedback with selectable ratio

• Analog board temperature feedback

• Enhanced -16V reverse polarity VPWR protection

• Pb-free packaging designated by suffix code PNA