Date: 26/03/2012
Power switch from IR for engine stop-start feature in cars
International Rectifier (IR) has introduced the automotive-qualified AUIR3240S battery power switch for the combustion-engine shut-off and restart function (Stop-Start system) that could help reduce fuel consumption in automotive vehicles by up to 15 percent, as per IR.
The AUIR3240S is a boost converter designed specifically for the Stop-Start system that halts the engine when a vehicle is stopped in traffic. This system requires a "board net stabilizer" using a power switch that disconnects the starter and main battery from the auxiliary electrical systems during engine start. The AUIR3240S can drive several MOSFETs in parallel for low on-state resistance (Rds(on)) with current consumption below 50ľA. The new device provides 15 V on the output with a input voltage of 4-36 V. The AUIR3240S also features diagnostic on the output current and a thermal sensor interface for very robust designs.
"Designing a boost converter with the requirement of low current consumption is very challenging using discrete components. The AUIR3240S makes the system robust, reliable and cost effective by cutting down the number of components and the PCB space," said David Jacquinod, Product Marketing Manager, IR's Automotive Products Business Unit.
The AUIR3240S is qualified according to AEC-Q100 standards, features an environmentally friendly, lead-free and RoHS compliant bill of materials, and is part of IR's automotive quality initiative targeting zero defects.
Specifications
Part Number Package Input voltage Output voltage Operating current
AUIR3240S SOIC8 4-36V >11.5V 50ľA max.
Availability and Pricing: Pricing for the AUIR3240S begins at US $0.85 each in 100,000-unit quantities. Production orders are available immediately. Prices are subject to changes.