VARIABLE TYPE LOW-VOLTAGE OUTPUT REGULATOR IC, AND LINEAR REGULATOR IC INCLUDING THE SAME, SWITCHING REGULATOR IC AND COMPOSITE REGULATOR IC

摘要

PROBLEM TO BE SOLVED: To provide a variable type low-voltage output regulator IC, capable of regulating a second reference voltage value by providing a reference voltage regulating externally attached resistance on the outside thereof, and capable of changing an output voltage value.;SOLUTION: This variable type low-voltage output regulator IC capable of obtaining a stable output voltage by controlling an input voltage has a power transistor (Tr) for controlling the input voltage, an operational amplifier (Op) for driving the power transistor (Tr), a first reference voltage generating circuit Vref1 for generating the first reference voltage, a constant current circuit (2), and the second reference voltage regulating internal resistance (Ra) with one end connected to the constant current circuit (2), and with the other end connected to the second reference voltage regulating terminal (7), the first reference voltage (Vref1) is input in one side input of the operational amplifier (Op), and the second reference voltage generated in the other end of the second reference voltage regulating internal resistance (Ra) is input in the other side input of the operational amplifier (Op).;COPYRIGHT: (C)2009,JPO&INPIT