STMicroelectronics announced a quad high-side intelligent power switch (IPS) – the VNI4140K. The devices integrate a logic interface, drivers and protection circuits on the same chip as a power stage, to simplify system design and save space in high-power industrial applications such as programmable logic controllers (PLCs), NC (numerical control) machines, robotics and building automation systems. The power switches include a broad range of current and thermal protection features, with per-channel diagnostic bits and double thermal protection being new additions in the VNI4140K. In addition to over-temperature protection for safe operation when current draw is too high, the switch’s case over-temperature protection independently limits the PCB temperature. Channels restart independently after a case thermal shut-down, to limit the peak current.

The VNI4140K provides short-circuit and over-current protection, under-voltage shut-down, fast demagnetization for safe operation with large inductive loads, and protection against loss of ground. Diagnostic outputs are open drain to enable wired-OR configuration with other devices, and the logic inputs are 3.3V CMOS/TTL compatible. The switch conforms fully to the IEC 61131-2 standard for programmable logic devices. Engineering samples of the VNI4140K, in the PowerSSO24 package, are available now, with volume production planned for January 2008. It is priced at $1.80 in quantities of 10,000 pieces.