EL SEGUNDO, Calif. — International Rectifier, IR®(NYSE: IRF), a world leader in power management technology, today introduced the IR3651, a synchronous PWM control IC designed for high performance synchronous DC-DC buck applications with an input voltage range up to 75V. With programmable switching frequency up to 400kHz, the IR3651 is ideal for a wide range of applications including telecom and base-station power supplies, networking servers, automotive and industrial control.

“The IR3651, with a pair of IR’s DirectFET® MOSFETs, can achieve greater than 88% system efficiency at 48Vin and 3.3Vout at 6A without a heatsink or airflow,” said Rami Hamze, senior marketing manager for IR’s DC-DC Computing Products. “Another advantage compared to similar devices on the market is IR3651’s higher maximum input voltage rating, enabling a more robust and reliable design,” he added.

The IR3651 is designed to drive a pair of external N-channel MOSFETs up to 25A. Protection features such as programmable soft-start, hiccup current limit and under-voltage lockout are provided for required system-level reliability in the event of a fault condition. The device also offers synchronization which allows simplified system-level EMI filter design.

The new controller includes a 150V half-bridge driver that allows for considerable design flexibility. For instance, the device may be used in low power (less than 60W) non-isolated DC-DC converters for network equipment as well as high power (greater than 200W) pre-regulator stages in regulated isolated converters. As a result, the IR3651 can be applied to designs for 36V inkjet printers, 28V aerospace applications, 24V electric bicycles, 72V battery systems, 18V wall bricks, 12V secondary-side post regulators and general purpose high-voltage, non-isolated DC/DC converters.

Part Number	Package	Fsw (kHz)	Vin Max (V)	Vin Min (V)	Vout Max (V)	Vout Min (V)	Imax (A)
IR3651SPBF	14-lead SOIC	100 - 400	75	12	0.70 x Vin	1.25	25

Availability and Pricing

The IR3651 is available immediately. Pricing is US $2.00 each in 10,000-unit quantities. Prices are subject to change. The devices are lead-free and are compliant with the Restriction of Hazardous Substances Directive (RoHS).