Third generation PoL voltage regulators focus on netcom, server and storage applications

June 28, 2012 // By Paul Buckley
International Rectifier has introduced the company's 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 12 Vin.

In addition to standard SupIRBuck features of switching frequency up to 1.5 MHz, 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 1.0 V.

The IR3894 and IR3895 SupIRBuck voltage regulators and trackers integrate IR’s latest generation high performance controller with power MOSFETs in a slim PQFN 5x6 mm package, and deliver 12 A and 16 A output current respectively to achieve more than 96% peak efficiency.

The IR3897, IR3898 and IR3899 deliver 4 A, 6 A and 9 A respectively in a 4x5 mm package.  The devices are ideal for low duty cycle single input applications, from 5 V or 6.8 V to 21 V with operating junction temperatures of -40 to 125°C. The common footprint of the devices provides design flexibility and allows cut-and-paste layout for fast time-to-market.

Availability and Pricing

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

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