12_V_REGULATOR_FOR_GTL_TERMINATION

Published:2009/7/13 3:02:00 Author:May | From:SeekIC

A recent development in high-speed digital design has resulted in a new family of logic chips called gunning transition Logic (GTL). These chips use high-speed logic and require active termination for best interconnection performance. The termination voltage required is 1.2 V, and the input voltage can be as low as 3.3 V from a logic supply. The LT1087 5-A low-dropout regulator shown here addresses these requirements by providing a regulated 1.2-V ±2 percent output voltage from a minimum 2.7-V input. Note that the LT1087 has a 1.25-V reference, but provides Kelvin sensing inputs for the feedback amplifier. The 4.42-Ω resistor is inserted as a simple way to adjust the internal reference downward without sacrificing regulation. This GTL termination circuit supplies 5 A maximum load current and can handle 3.3-, 5-V, or higher supplies, although 3.3 V is recommended for minimum device dissipation.



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