Date: 23/08/2010

Automotive power MOSFETs for Class D audio systems from IR

International Rectifier(IR) has introduced the AUIRF7640S2, AUIRF7647S2 and AUIRF7675S2, family of automotive DirectFET2 power MOSFETs for high frequency switching applications including the output stage for Class D Audio systems.

The AUIRF7640S2, AUIRF7647S2 and AUIRF7675S2 devices are optimized with low gate charge (Qg) to improve THD and efficiency while low Diode Reverse Recovery Charge (Qrr) further improves Total Harmonic Distortion (THD) and lowers EMI.

The AUIRF7640S2 and AUIRF7647S2 Small Can devices have a footprint smaller than that of SO-8, according to IR. These devices are capable of delivering 100W per channel into an 8 Ohm load with no heat sink to offer a compact class D solution ideal for saving PCB space where multiple channels are required.

The Medium Can AUIRF7675M2 device features a footprint 54 percent smaller than a DPak, according to IR. This device is capable of delivering 250W per channel into a 4Ohm load with no heat sink making it well suited for the sub-woofer output stage of class D audio systems.

“The new DirectFET2 devices complement the previously released AUIRF7665S2 to offer designers alternative voltage and RDS(on) ratings for different power levels in Class D Audio systems,” said Benjamin Jackson, product manager, IR’s Automotive Products Business Unit.

As with all DirectFET products, the new devices offer minimal thermal impedance and parasitic package resistance and inductance to deliver excellent power density and efficiency facilitated by dual-sided cooling.

The devices are qualified according to AEC-Q101 standards, feature an environmentally friendly, lead-free and RoHS compliant bill of materials, and are part of IR’s automotive quality initiative targeting zero defects.

Specifications
Part Number Package Vds Rds(on)
typ Rds(on)
max Rg
(typ) Qg
(typ)
AUIRF7640S2 DF2 S Can 60V 27mOhm 36mOhm 3.5Ohm 7.3nC
AUIRF7647S2 DF2 S Can 100V 26mOhm 31mOhm 1.6Ohm 14nC
AUIRF7675M2 DF2 M Can 150V 47mOhm 56mOhm 1.2Ohm 21nC



Price:
The AUIRF7640S2 begins at each US$0.37 for 100,000-unit quantities.
The AUIRF7647S2 begins at each US$0.54 for 100,000-unit quantities.
The AUIRF7675M2 begins at each US$0.68 for 100,000-unit quantities.

Availability: Now