EZ1580 datasheet(5/5 Pages) SEMTECH | DUAL INPUT LOW DROPOUT REGULATOR

5 page

652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL INPUT

LOW DROPOUT REGULATOR

EZ1580/EZ1581

EZ1582/EZ1583

February 26, 1999

DEVICE OUTLINE - TO-220, 5 PIN

APPLICATION INFORMATION

The EZ158X is a low dropout regulator designed to

power the next generation of low voltage, split voltage

plane processors, such as the Pentium® Processor

P55C, the IBM PowerPC™ 603EV and 604EV and the

AMD5

K86™ and K6 Processors.

The dropout voltage is minimized by utilizing a

separate input voltage, V

CONTROL, which should exceed

OUT by at least 1.3V. The 2.5V power for the load

(microprocessor core) can be derived from a 3.3V

system supply. Since the efficiency of a linear regulator

is the ratio of the output to the input voltage, heat

dissipation is reduced by using a 3.3 input, thereby

lowering heatsink and cooling fan costs. For a load of

7A at 2.5V, the regulator would dissipate 17.5W when

converting from 5V, but only 5.6W from a 3.3V input.

Remote Kelvin sensing of the output voltage can be

achieved by connecting the sense pin to the output at

the load. Remote sensing will reduce errors

associated with resistive trace losses between

regulator and processor.

DEVICE OUTLINE - TO-263, 5 PIN

MINIMUM LAND PATTERN - TO-263, 5 PIN

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