EL SEGUNDO, Calif. — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced the IR3640M PWM control IC for high performance synchronous DC-DC buck applications including servers, storage, netcom, game consoles and general purpose DC-DC converters.

The IR3640M is a single phase synchronous buck PWM controller with integrated MOSFET drivers and bootstrap diode. The device’s single loop voltage mode architecture simplifies design while delivering precise output voltage regulation and fast transient response.

“The IR3640M is a feature-rich controller that may be paired with IR’s DirectFET® MOSFETs to deliver a highly flexible, efficient solution and, because of its wide input and output voltage range can be used in a variety of high performance point-of-load applications,” said John Lambert, IR’s POL products marketing manager, Enterprise Power Business Unit.

“Moreover, the IR3640M allows designers who use IR’s SupIRBuck™ integrated voltage regulators for loads lower than 12A to easily solve their current needs in the 12 to 30A range, as the IC employs the same control engine, monitoring and reporting as the newly established SupIRBuck industry standard,” he added.

The IR3640M is designed to drive a pair of N-Channel MOSFETs from 250kHz to 1.5MHz switching frequency, providing designers with the flexibility to optimize the solution for best efficiency or smallest footprint. The output voltage can be precisely regulated from as low as 0.7V within a tolerance of +/-1% over temperature, line and load variations.

The new device integrates a range of features including programmable soft start, pre-bias start up, voltage tracking, external synchronization, enable input and Power Good output. Fault protection features include thermal shutdown, over-voltage and over-current shutdown and under-voltage lock out. The device is offered lead free and is RoHS compliant.

Specifications

PWM Control IC

Part Number	Package	Vin Range (V)	Vout Range (V)	Switching Frequency (kHz)	Features
IR3640MPbF	20L 3x4 mm MLPQ	1.5 - 24	0.7 – 0.9 x VIN	250 - 1,500	1% Accuracy, OCP, OTP, PB, SS, PGOOD, External Sync, Tracking

DirectFET® MOSFETs

Part Number	BVDSS (V)	RDS(on) typ@10V (mOhms)	RDS(on) typ@4.5V (mOhms)	VGS (V)	Qg typ (nC)	Qgd typ (nC)	Outline Code
IRF6710S	25	4.5	9.0	+/-20	8.8	3.0	S1
IRF6795M	25	1.4	2.4	+/-20	35	10	MX

Design Support

A reference design kit, the IRDC3640, 25A, 600kHz synchronous buck converter featuring the IR3640M PWM control IC and IRF6710S and IRF6795M DirectFET® MOSFETs is available.

Availability and Pricing

Pricing for the IR3640MPbF begins at US $0.44 each in 10,000-unit quantities. The IRDC3640 reference design kit costs US $94 per kit. Production orders are available immediately. Prices are subject to change.