Current sensing in a buck-boost switching regulator using integrally embedded PMOS devices
US7759923B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2008 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Mar 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/10
Abstract
A current sense device for a power transistor is described. The power transistor is formed in a cellular structure including a cellular array of transistor cells. The current sense device includes multiple transistor cells in the cellular array of transistor cells of the power transistor being used as sense transistor cells. The sense transistor cells are evenly distributed throughout the cellular array where the source terminal of each sense transistor cell is electrically connected to a first node through a metal line in the first metal layer and through a metal line in the second metal layer where the metal lines are electrically isolated from the metal lines connecting the transistor cells of the power transistor. The sense transistor cells measure a small portion of the current flowing through the power transistor based on the size ratio of the current sense device and the power transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.