Date: 04/08/2011

High-side power switch with current-sensing and protection circuits for automotive apps

International Rectifier (IRF), has introduced the AUIR331x family of high-side intelligent power switch (IPS) devices with accurate current-sensing and built-in protection circuits for automotive applications such as intelligent glow-plug controls, auxiliary positive temperature coefficient (PTC) heaters, engine cooling fan drivers and interior fan controllers.

IRF says the current-sensing accuracy, particularly at low current, enables precise monitoring of load current in order to provide additional data to the microcontroller for diagnostic applications. Typical examples include open-load detection, early warning of overload conditions or stall motor condition. In addition, the AUIR3316S provides a slow-switching version of the AUIR3313S, which helps minimize noise in EMI-sensitive automotive applications.

"The AUIR331x family includes all protection functions to ensure safe and reliable automotive application up to 30 A continuous and 90 A peak. The accurate current-sensing function adds value to microprocessor-based systems and modules by improving diagnostic capabilities," said David Jacquinod, product marketing manager, IR Automotive Business Unit.,

The protection features integrated in AUIR331x family include over-temperature and over-current shutdown to offer capability to operate repetitively under short circuit conditions according to the latest AEC Q100-012 standard. In many applications, additional protection devices such as fuses can be eliminated. The over-current shutdown protection feature is programmable which allows optimization according to the requirements of the load or the application.

In the case of a reverse battery condition, an integrated protection circuit turns the main MOSFET switch on, helping to relieve the intrinsic body diode, reducing or eliminating thermal problems. Additional features such as ESD protection and an active clamp circuit guarantee safe operation and protection under harsh automotive operating conditions. Part Number Package Rdson
(max at 25C) Programmable Overcurrent shutdown TJ Breakdown
voltage
(min.) OC/OT Protection type
AUIR3313S D2PAK 7mohm 10 to 90A 165°C 40V shutdown
AUIR3313 TO-220 7mohm 10 to 90A 165°C 40V shutdown
AUIR3314S D2PAK 12mohm 6 to 58A 165°C 40V shutdown
AUIR3314 TO-220 12mohm 6 to 58A 165°C 40V shutdown
AUIR3315S D2PAK 20mohm 3 to 30A 165°C 40V shutdown
AUIR3315 TO-220 20mohm 3 to 30A 165°C 40V shutdown
AUIR3316S D2PAK 7mohm 10 to 90A 165°C 40V shutdown
AUIR3316 TO-220 7mohm 10 to 90A 165°C 40V shutdown


Availability and Pricing: Price range is from US $0.89 for the AUIR3315S to US $1.20 for the AUIR3313S in 100,000-unit quantities. Prices are subjected to changes.