IR introduces AUIR3320S intelligent power switch for auto PTC heaters

International Rectifier has introduced the reliable AUIR3320S high-side IPS (intelligent power switch) optimized for automotive auxiliary PTC (positive temperature coefficient) electric heaters. Offering very low on-state resistance (Rds(on)) of 4 mohm (max.) at 25°C, AUIR3320S delivers higher current, with a smaller heat sink, to reduce system footprint. The new 40 V device also features current sensing, to allow precise monitoring of load current, and to provide additional data to the microcontroller, for diagnostic applications. In addition, the AUIR3320S offers both over-current, and over-temperature protection. That results in a more reliable operation, even during the short circuit protection, as well as a smooth turn-on and turn-off waveform, to limit EMI. "PTC electric heaters are now widely adopted and offer improvements in cabin comfort. However, safety and reliability are critical design factors, due to the high current required and the fact that the application resides in the interior of the vehicle. Featuring very low Rds(on), current sensing and a comprehensive range of protection features, the AUIR3320S provides reliable, optimized PTC heaters," says David Jacquinod, product marketing Manager, IR's Automotive Products Business Unit. International Rectifier's automotive grade IPS products are subject to dynamic and static part average testing, combined with 100% automated wafer level visual inspection, as part of IR's automotive quality initiative, targeting zero defects. The devices are qualified, according to AEC-Q100 standards, and feature an environmentally friendly, lead-free and RoHS-compliant bill of materials. Availability and Pricing Pricing for the AUIR3320S begins at US $1.22 in 100,000-unit quantities. Production orders are available immediately. Prices are subjected to change. International Rectifier .