Control circuit for power transistors in a voltage regulator

US6040736A · kind A · utility

Assignees

• SGS-Thomson Microelectronics S.A. · IT
• Magneti Marelli S.p.A. · IT

Inventors

• Andrea Milanesi · Milano, IT
• Vanni Poletto · Trino, IT
• Alberto Poma · Pavia, IT
• Marco Morelli

Key dates

• Filing date: Dec 4, 1997
• Grant date: Mar 21, 2000
• Expiry date: Dec 4, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F1/575
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A voltage-regulator circuit with a low voltage drop uses a DMOS power transistor driven by a charge pump. The control circuit includes two feedback loops: a first feedback loop having a high gain and accuracy but low response speed, and a second feedback loop having a wide passband and fast response speed, but low gain.