Low drop-out regulator with fast current limit

Details Low drop-out regulator with fast current limit Low drop-out regulator with fast current limit

2008-11-13

2009-11-03

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S274000

Reexamination Certificate

active

07612549

ABSTRACT:
An LDO with fast current limit includes P-type transistor, an error amplifier, an adjustable reference voltage circuit for generating an adjustable reference voltage, and an N-type transistor. The P-type transistor includes a first end coupled to the input voltage source, a second end for outputting an output voltage source, and a control end for receiving a current control signal in order to control the current of the output voltage source. The error amplifier generates the current control signal according to the reference voltage and a voltage divided from the output voltage source. N-type transistor includes a first end coupled to the output end of the error amplifier, a second end coupled to the input voltage source, and a control end for receiving the adjustable reference voltage. When the N-type transistor is turned on, the voltage of the current control signal is clamped by the adjustable reference voltage.

REFERENCES:
patent: 6246221 (2001-06-01), Xi
patent: 6952091 (2005-10-01), Bansal
patent: 6977491 (2005-12-01), Caldwell et al.

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