Third generation voltage regulators from International Rectifier

International Rectifier is marketing itsthird generation of integrated, SupIRBuck synchronous buck voltage regulators that 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.

These devices address the challenges of high frequency, narrow duty cycle operation. The dramatic reduction in jitter for pulse widths as small as 50ns enables 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 SupIRBuck's efficiency within the same compact footprint.

SupIRBuck devices offer additional features and improvements compared to previous generation devices in addition to standard SupIRBuck features of switching frequency up to 1.5MHz, pre-biased startup, input voltage aware enable, tracking and programmable power-good.

These additional features include reference voltage accuracy of 0.5% and enhanced line/load regulation with input voltage feed-forward and thermal compenzation for current limit. Other enhancements include analog input for margining, PLL for smooth external frequency synchronization and 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锟絧ower 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 -40^oC to 125^oC.