A Low Dropout Regulator with Low Quiescent Current

DOI

10.2991/lemcs-15.2015.336How to use a DOI?

Keywords

Quiescent Current; Bandgap; Power transistors; Low dropout; Output current

Abstract

This paper introduces a low dropout regulator (LDO) by bipolar process. This LDO is composed of a starting circuit, a bandgap reference, an amplifier and power transistors. The bandgap produced a reference voltage about -1.25V, this voltage will be amplified to -5V by the error amplifier, power transistors and feedback resistances, and the output of the amplifier provides the drive current to the power transistors to carry 1A load current. The starting circuit provides current to the constant current source to ensure the work of the internal structures. The bandgap, enable circuit, error amplifier and the output circuit are analyzed respectively. Through simulation results, it can be seen the output current of this regulator is 1.0A, and the typical quiescent current of this regulator is below 2mA, the method to reduce the quiescent current is presented.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Xin Xu
AU  - Jun Jiang
PY  - 2015/07
DA  - 2015/07
TI  - A Low Dropout Regulator with Low Quiescent Current
BT  - Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science
PB  - Atlantis Press
SP  - 1669
EP  - 1672
SN  - 1951-6851
UR  - https://doi.org/10.2991/lemcs-15.2015.336
DO  - 10.2991/lemcs-15.2015.336
ID  - Xu2015/07
ER  -