Fast regulator paces high performance processors
Mitchell Lee and Craig Varga
Abstract
The LT1585 linear regulator, which exhibits extremely fast response to transients, is described.
Keywords
Linear regulator
LT1585
Transient response
New high performance microprocessors require a fresh look at power supply transient response. Pentium processors, for example, have current demands that go from a low idle mode of 200mA to a full load current of 4A in 20ns. A transition of the same magnitude occurs as the processor reenters its power saving mode. In addition, the overall supply tolerances have been narrowed significantly from the traditional ±5% for 5V supplies and include transient conditions. When all possible DC error terms ...
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