ADAPTIVE LOW-DROPOUT REGULATOR HAVING WIDE VOLTAGE ENDURANCE RANGE, CHIP AND TERMINAL

摘要

An adaptive low-dropout regulator (LDD) having a wide voltage endurance range comprises a power supply voltage tracker (P1), a voltage and current convertor (101), an error amplifier (201), a current mirror circuit (102) and a dynamic voltage divider (103). One end of the power supply voltage tracker (P1) is connected to a Vdd, the other end thereof is connected to the voltage and current convertor (101) connected to an input end of a current mirror, and an output end of the current mirror circuit (102) is connected to source electrodes of two input field effect transistors (N3, N4) in the error amplifier (201). Source electrodes of two load field effect transistors (P2, P3) in the error amplifier (201) are connected to the Vdd. Dynamic voltage dividers (103A, 103B) are connected respectively between each of the input field effect transistors (N3, N4) and the corresponding load field effect transistors (P2, P3). The regulator can automatically change a bias condition thereof according to changes in the power supply voltage, thus ensuring a voltage difference between each device end without exceeding a nominal working voltage thereof.