Low drop-out voltage regulator and an adaptive frequency compensation

US6861827B1 · kind B1 · utility

Assignee

• System General Corp. · TW

Inventors

• Ta-Yung Yang · Milpitas, US
• Hsuan-I Pan · Taipei, TW
• Chern-Lin Chen · Zhubei City, TW

Key dates

• Filing date: Sep 17, 2003
• Grant date: Mar 1, 2005
• Expiry date: Sep 17, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F3/262
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method and apparatus to dynamically modify the internal compensation of a low drop-out (LDO) voltage regulator is presented. The process involves creating an additional equivalent series resistance (ESR) from an internal circuit. The additional ESR of the internal circuit is sufficient to ensure the DC output stability. This allows the ESR of the output capacitance to be reduced to zero if desired, for improved transient response.