Voltage regulator
US8004257B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2009 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Aug 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/573
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A voltage regulator has a first error amplifier circuit that amplifies a difference between a first reference voltage and a voltage based on an output voltage of an output transistor, and an overcurrent protection circuit that detects an overcurrent flowing through the output transistor and limits a current of the output transistor. The overcurrent protection circuit has an output current detection transistor that feeds a detection current in accordance with an output current of the output transistor, a voltage generation circuit that generates a voltage based on the detection current, a second error amplifier circuit that amplifies a difference between the voltage from the voltage generation circuit and a voltage set by a second reference voltage supplied by a temperature detection circuit and a voltage based on the output voltage, and an output current limiting transistor that controls a gate voltage of the output transistor and has a gate that is controlled by an output of the second error amplifier circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.