Low drop-out voltage regulator

Details Low drop-out voltage regulator Low drop-out voltage regulator

2007-08-07

2007-08-07

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S275000, C323S280000, C323S284000

Reexamination Certificate

active

10504909

ABSTRACT:
A low drop-out voltage regulator having a pass device (Mp), an error amplifier (M1-M51) and a double regulation loop including DC feedback loop (R1, R2) and an AC feedback loop (Rf, Cf) including a high pass filter (Cf). Combining these two loops creates an ultra low frequency internal pole which makes the regulator stable substantially independent of the output bypass capacitor's value. This provides the following advantages: allows the use of very low bypass capacitors; allows to extend the PSRR frequency behavior; allows an increase in the regulator's efficiency (reduced power consumption on heavy loads).

REFERENCES:
patent: 4258337 (1981-03-01), Clinton
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patent: 5631598 (1997-05-01), Miranda et al.
patent: 6246221 (2001-06-01), Xi
patent: 6300749 (2001-10-01), Castelli et al.
patent: 2002/0005711 (2002-01-01), Bakker et al.
patent: 0 957 421 (2003-09-01), None
PCT Search Report PCT/EP03/001367 mailed Aug. 19, 2003.

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