are series of fixed voltage integrated circuit Voltage regulators are designed for a wide range of applications. These applications include on-card regulations for the elimination of noise and distribution problems related to single-point regulation. Moreover, they can be used with power-pass elements to make high voltage regulators. One of these controllers can deliver up to 100 mA of output current. The internal limitation and thermal shutdown of these controllers essentially make them immune to overload. When used as a replacement for a zener diode resistor combination, effective output improvement Impedance can be obtained along with lower bias stream.