EL SEGUNDO, Calif. — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced its third generation of integrated, feature-rich SupIRBuck® synchronous buck voltage regulators designed to address the new requirements of emerging energy efficient netcom, server and storage applications.

The new SupIRBuck single output devices feature a newly patented modulator scheme that generates the industry’s smallest, jitter free pulse widths. The ability to generate narrow pulses coupled with robust source/sync current handling capability makes this family ideal for generating DDR memory termination voltage directly from 12Vin.

“With this third generation of SupIRBuck devices, IR has addressed the challenges of high frequency, narrow duty cycle operation. By dramatically reducing jitter for pulse widths as small as 50ns, IR has enabled customers to have higher closed loop bandwidth resulting in even better transient response and lower output capacitance. In addition, the integration of a smart LDO has further increased the SupIRBuck’s industry leading efficiency within the same compact footprint” said Cecilia Contenti, IR’s POL Product Marketing Manager, Enterprise Power Business Unit.

In addition to standard SupIRBuck features of switching frequency up to 1.5MHz, pre-biased start-up, input voltage aware enable, tracking and programmable power-good, these third generation SupIRBuck devices offer a host of additional features and improvements compared with previous generation devices to address the needs of telecom, netcom, server and storage customers including reference voltage accuracy of 0.5%, enhanced line/load regulation with input voltage feed-forward and thermal compensation for current limit. Other enhancements include analog input for margining, PLL for smooth external frequency synchronization, start/stop ramp and minimum input voltage of 1.0V.

The IR3894 and IR3895 SupIRBuck voltage regulators and trackers integrate IR’s latest generation high performance controller with power MOSFETs in a slim PQFN 5x6mm package, and deliver 12A and 16A output current respectively to achieve more than 96% peak efficiency. The IR3897, IR3898 and IR3899 deliver 4A, 6A and 9A respectively in a 4x5mm package. These are ideal for low duty cycle single input applications, from 5V or 6.8V to 21V with operating junction temperatures of -40oC to 125oC. The common footprint of the devices provides design flexibility and allows cut-and-paste layout for fast time-to-market.

Specifications

Part Number	Package (mm)	VIN Range (V)	VOUT Range (V)	IOUT (A)	Switching Frequency (kHz)
IR3895MTRPbF	PQFN 5x6	1 - 21	0.5 – 86%Vin	16	300 -1,500
IR3894MTRPbF	PQFN 5x6	1 - 21	0.5 – 86%Vin	12	300 -1,500
IR3899MTRPbF	PQFN 4x5	1 - 21	0.5 – 86%Vin	9	300 -1,500
IR3898MTRPbF	PQFN 4x5	1 - 21	0.5 – 86%Vin	6	300 -1,500
IR3897MTRPbF	PQFN 4x5	1 - 21	0.5 – 86%Vin	4	300 -1,500

Reference Design	Featured Part	VIN Range (V)	VOUT Range (V)	IOUT (A)	Switching Frequency (kHz)
IRDC3895	IR3895M	12	1.2	16	600
IRDC3894	IR3894M	12	1.2	12	600
IRDC3899	IR3899M	12	1.2	9	600
IRDC3898	IR3898M	12	1.2	6	600
IRDC3897	IR3897M	12	1.2	4	600

Design Tools

Datasheets and application notes are available via the part number links found in the preceding tables. The IRDC38(99)(98)(97)(95)(94) SupIRBuck reference designs featuring the new devices are also available.

A user friendly, interactive, web-based tool is available at http://mypower.irf.com/SupIRBuck and enables the rapid selection and simulation of selected SupIRBuck products. Based on a designer’s given input and output parameters, the SupIRBuck online tool selects suitable devices for a given application. Once basic requirements are entered, the tool allows the user to capture schematics, create a reference design along with associated Bill of Materials (BOM), view waveforms, and perform complex thermal and application analysis quickly and easily to dramatically accelerate development time.

Price and Availability

Pricing for the IR3897 begins at US $1.72 each in 10,000-unit quantities. The IR3898 and IR3899 cost US $2.06 and US $2.40 each respectively in 10,000-unit quantities and the IR3894 and IR3895 cost US $2.76 and US $3.10 each respectively in 10,000-unit quantities. Pricing for the IRDC38(99)(98)(97)(95)(94) SupIRBuck reference designs start at US $29 per kit. Production orders are available immediately. Prices are subject to change.