Thermal shutdown circuit with hysteresis and method of using
US6759891B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Apr 29, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated circuit (10) includes a thermal shutdown circuit that incorporates hysteresis for shutting down a functional circuit (13) when its temperature exceeds a predefined value. First and second current sources (18, 17) respectively produce first and second reference currents (IREF1, IREF2) representative of first and second die temperatures of the integrated circuit. A current mirror (14) has an input (19) for summing the first and second reference currents and an output (15) for providing a mirror current (IMIRROR). A detection circuit (12) has an output coupled to the output of the current mirror for sinking the mirror current to produce a detection signal (VDET) as a function of the first and second die temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.