DC136A

DC136A is a LT1575 UltraFast linear regulator for microprocessor power demo circuit. It is designed to provide power for high-performance MPUs, such as the Intel Pentium® processor. These CPUs exhibit extreme dynamic loading of core power supply and have very tight supply voltage tolerances. To date, only way to maintain voltage tolerance in the face of large magnitude transient loads was to include several large value tantalum or aluminium electrolytic capacitors at the power supply output. The demo board contains an LT1575 based linear regulator, a Pentium compatible socket and a load pulse generator circuit. The Pentium socket is included to permit the use of an Intel Power Validator to generate load steps that emulate a Pentium’s load characteristics. If a Power Validator is not available, the board contains its own load step generator. Although not as flexible as a Power Validator, the step generator will produce loads that are adequate to evaluate the regulator’s performance.

• LT1575 drives a power MOSFET pass transistor, forming a very wide bandwidth linear regulator
• Loop crossover frequency is on the order of 1MHz
• Total response time to a 5A load step is approximately 370ns
• As a result of extreme speed, the bulk capacitors may be entirely eliminated