A wide input voltage range, output-capacitorless linear voltage regulator in 0.25UM BCD process

Linear voltage regulators are widely used in electronic systems for low noise and precise output voltage. This paper presents an output-capacitorless linear voltage regulator with 5.5V∼40V input voltage, 5V output voltage and 100mA load current. The damping-factor-control (DFC) frequency compensation has effectively enhanced the loop stability. A high to low circuit is presented to supply power for the low working voltage bandgap. Finally, the load regulation is 75uV/mA @ VIN=40V; line regulation is 0.0019%; quiescent current is 130µA @VIN=5.5V and 600µA @VIN=40V. The proposed regulator also has fine load transient response.