Hot swap controller with zero loaded charge pump
US7683693B2 · kind B2 · utility
2Cited by
8References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Jun 3, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/0822
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention includes a pass transistor that limits current drawn from a circuit without using a series resistor and while drawing minimal current from an external supply. A current mirror of the output current is formed and compared to a reference current. When the output current increases, the mirror current increases proportionally, and when a threshold is crossed, the pass transistor is turned off. The pass transistor is biased from a charge pump that provides a voltage, a current from which a current mirror is drawn that controls the pass transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.