Abstract—Low-quiescent current low-dropout regulator based on a two-stage amplifier with wide input range is presented. Every branch only consumes a little quiescent current by developing an extremely low current bias of 40nA. In addition, the stability of bandgap reference depends on the loop of LDO, which can simplify the circuit and reduce the number of branches to reduce current consumption. The proposed LDO can output a steady voltage of 3V as input voltage varies between 3.5V-24V. Thus it is an excellent choice for both battery-powered systems as well as industrial applications that see large line transients. And the quiescent current is virtually constant over the complete load current and ambient temperature range. The LDO with the proposed structure has been implemented in a 0.35-um Bi-CMOS process. It is able to deliver up to 150mA load current and only dissipates 3.6uA quiescent current at no-load and full-load condition. Good line regulation and load regulation are also achieved with max deviation voltage at output under 18mV.

Index Terms—LDO, low-quiescent current, wide input range, line regulation, load regulation

Cite: Xueshuo Yang, Tiejun Lu, Jianhui Zhang, and Yu Zong, "A Low-Quiescent Current Low-Dropout Regulator with Wide Input Range," International Journal of Electronics and Electrical Engineering, Vol. 3, No. 3, pp. 182-186, June 2015. doi: 10.12720/ijeee.3.3.182-186