A robust frequency compensation scheme for LDO regulators

Author

Chava, Chaitanya K. ; Silva-Martinez, Jose

Author_Institution

Analog & Mixed Signal Center, Texas A&M Univ., College Station, TX, USA

Volume

5

fYear

2002

fDate

2002

Abstract

In the frequency compensation scheme of low drop out (LDO) voltage regulators, a zero generated by the series combination of load capacitor and its electro static resistance (ESR) plays an important role. This frequency compensation tends to be inefficient, as one has to take into consideration a range of specified values for load capacitor and R_ESR, along with their variation with process and temperature. This paper presents a robust frequency compensation scheme that generates a zero internally without relying on RESR of load capacitor. The proposed frequency compensation has better RF noise rejection, low power consumption and improved transient response. The LDO regulator is designed in 0.35μm TSMC technology.

Keywords

compensation; control system synthesis; frequency control; load (electric); power capacitors; robust control; transient response; voltage regulators; 0.35 micron; LDO regulators; control design; electro static resistance; load capacitor; low-drop out voltage regulators; power consumption; robust frequency compensation scheme; transient response; Capacitors; Ceramics; Circuit stability; Frequency; Low voltage; Paramagnetic resonance; Regulators; Robustness; Stability analysis; Transient response;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1010831

Filename

1010831