Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-01-11
2009-12-15
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
Reexamination Certificate
active
07633280
ABSTRACT:
An LDO regulator (10) produces an output voltage (Vout) by applying the output voltage to a feedback input (6) of a differential input stage (10A) and applying an output (3) of the differential input stage to a gate of a first follower transistor (MP4) having a source coupled to an input (8) of a class AB output stage (10C) which generates the output voltage. Demanded load current is supplied by the output voltage during a dip in its value to a gate of a second follower transistor (MP5) having a gate coupled to the output of the input stage to decrease current in a current mirror (MN5,6) having an output coupled to a current source (I1) and a gate of an amplifying transistor (MN7). This causes the current source to rapidly turn on the amplifying transistor to cause it to rapidly turn on a cascode transistor (MN3), causing it to turn on a pass transistor (MP3) of the output stage.
REFERENCES:
patent: 6930551 (2005-08-01), Ivanov et al.
patent: 7274256 (2007-09-01), Ricotti
patent: 7471150 (2008-12-01), Alenin et al.
patent: 7508265 (2009-03-01), Lin
Ivanov Vadim V.
Kunz Keith E.
Brady III Wade J.
Patti John J.
Riley Shawn
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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