Low-dropout regulator with startup overshoot control

Details Low-dropout regulator with startup overshoot control Low-dropout regulator with startup overshoot control

2005-07-21

2008-07-22

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S280000

Reexamination Certificate

active

07402987

ABSTRACT:
The present invention provides an LDO regulator having a greatly improved overshoot characteristic through the use of an output voltage based feedback loop. More specifically, in the invention, one or more resistors in the divider network in a conventional LDO regulator is replaced with a variable resistor. By varying the resistance of the variable resistor as a function of the output voltage of the LDO regulator, the closed-loop gain of the LDO amplifier may be modulated in such a way as to reduce overshoot in the output voltage of the LDO regulator. In particular, the targeted final output voltage value may be arbitrarily lowered for a predetermined period of time, so that the LDO regulator output may rapidly reach a steady state voltage that is very close to the final desired regulating value without exceeding the final desired regulating value during regulator startup.

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Adjustable Voltage Regulator 1C TK11100CS, Application Manual, TOKO, Jul. 2004, pp. 1-25.

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