Circuit and method combining a switching regulator with one...

Details Circuit and method combining a switching regulator with one... Circuit and method combining a switching regulator with one...

2006-05-25

2009-02-03

Patel, Rajnikant B (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S282000

Reexamination Certificate

active

07486058

ABSTRACT:
Various embodiments provide a system comprising a regulator and one or more low-drop-out linear regulators for improved efficiency. In one embodiment, a system comprises a regulator and one low-drop-out linear regulator comprising a pass transistor, and furthermore, another transistor matched to the pass transistor except for size. The matching transistor provides information regarding the source-drain voltage drop of the pass transistor. A controller circuit makes use of this information to set the regulator's output voltage to improve the efficiency of the system. Other embodiments are described and claimed.

REFERENCES:
patent: 4675594 (1987-06-01), Reinke
patent: 4928056 (1990-05-01), Pease
patent: 6208644 (2001-03-01), Pannell et al.
patent: 6850046 (2005-02-01), Chapuis

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