The 33298 is a smart eight output low side power switch. It is a versatile device incorporating an 8-bit serial-in shift register to control an 8-bit parallel output latch providing control of eight independent ON/OFF output switches. Applications include the control of solenoids, relays, lamps, small DC motors, and other moderate current loads (1.0 – 3.0A).

The 33298 interfaces directly with a microcontroller to control various inductive or incandescent loads. Input control is fast. Data rates are guaranteed to 2.0 MHz but the device is capable of rates to 8.5 MHz @ 25°C.

Each output uses high efficiency MOSFET power transistors configured with open drains. Each low ON resistance output (0.4Ω RDS(ON) @ 25°C) is capable of sinking up to 3.0A of transient current. On a continuous basis, each output can simultaneously (with all outputs ON) handle 0.5A of current when the device is soldered onto a typical PC board. Higher output currents are dependent on the number of outputs simultaneously ON. The circuits innovative monitoring and protection features include very low standby current.

Features

• Designed to operate over wide supply voltages of 5.5 to 26.5V

• Interfaces to microprocessor using 8-bit SPI I/O protocol up to 3.0MHz

• 1.0A peak current outputs with maximum RDS(ON) of 1.8Ω at TJ - 150°C

• Outputs current limited to accommodate in-rush currents associated with switching incandescent loads

• Output voltages clamped to 65V during inductive switching

• Maximum sleep current (IPWR) of 25µA

• Maximum of 4.0mA IDD during operation

• Pb-free packaging designated by suffix code EG