Low dropout regulator and the over current protection...

Details Low dropout regulator and the over current protection... Low dropout regulator and the over current protection...

2008-09-23

2010-12-14

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S279000

Reexamination Certificate

active

07852054

ABSTRACT:
An over current protection circuit for low dropout regulator comprises a sense transistor, a sense resistor, an operational amplifier and a first transistor. The sense transistor senses the current flowing through the power transistor. The sense resistor is coupled to the sense transistor and shares the same current flowing through the sense transistor. The operational amplifier outputs a control signal according to the voltage across the sense resistor and a reference voltage. The first transistor controls the power transistor according to the control signal.

REFERENCES:
patent: 7015680 (2006-03-01), Moraveji et al.
patent: 7053591 (2006-05-01), Amrani et al.
patent: 7411376 (2008-08-01), Zhang
patent: 7602162 (2009-10-01), Bansal et al.
patent: 7622902 (2009-11-01), Kao et al.
patent: 7759923 (2010-07-01), Miller et al.

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