Smart high-side switches for 24V applications

August 16, 2013 // By Graham Prophet
A data sheet from Infineon outlines a series of pin-compatible single-channel 24V high-side switches in the company's PROFET+ 24V family, in DSO-14 EP packages and with embedded diagnostic and protective functions.

The power transistor in the BTT6020-1EKA, BTT6030-1EKA, and BTT6050-1EKA is an N-channel vertical power MOSFET with charge pump. The devices are designed to drive lamps as well as LEDs in the harsh automotive environment, in particular the 24-V on-board systems of trucks and other heavy vehicles.

The high current sense accuracy is able to diagnose even the smallest loads, such as LEDs. The devices feature high short-circuit robustness, specified at a minimum of 100k SC cycles. You can use the parts with grounded 24V loads, and diagnostic feedback is available to a microcontroller; you can switch all types of resistive, inductive and capacitive loads including loads with high inrush currents, such as lamps or loads with low currents such as LEDs: the parts replace electromechanical relays, fuses and discrete circuits.

Diagnostics include; Proportional load current sense; open load in ON and OFF; short circuit to battery and ground; overtemperature sense; current sense matching between channels; provision of stable diagnostic signal during short circuit conditions; and enhanced k ILIS accuracy with calibration. The parts are AEC qualified, operate over 5-36V and have a standby current under 0.5μA. They are ESD protected and have PWM capability up to 500Hz, with very low leakage current in the OFF state. Logic inputs are 3.3V and 5V compatible.