Power-on circuit for low dropout dual supply voltage regulator

Details Power-on circuit for low dropout dual supply voltage regulator Power-on circuit for low dropout dual supply voltage regulator

1998-05-14

2000-07-18

Han, Jessica

Electricity: power supply or regulation systems

Input level responsive

232284, 232314, G05F 500

Patent

active

060912359

ABSTRACT:
Efficient very low dropout (i.e., approximately equal to about V.sub.CESAT of the output transistor) dual supply voltage regulator circuits and methods are provided. The voltage regulators are capable of providing very low dropout irrespective of supply sequencing. Traditional supply sequencing problems are overcome by including an power-on circuit that monitors the output power supply during power-on. The power-on circuit is also coupled to any location in the regulator circuit where the drive current can be inhibited whenever the output power monitor senses that the output power supply is not fully operational. The power-on circuit operates to prevent drive current from being supplied to the output transistor unless output power is available so that the substrate of the regulator is not permitted to become forward biased (and thus prevents the establishment of an undesired latch condition).

REFERENCES:
patent: 3754182 (1973-08-01), Morris et al.
patent: 4709320 (1987-11-01), Konopka
patent: 4755741 (1988-07-01), Nelson
patent: 4792747 (1988-12-01), Schroeder
patent: 5280233 (1994-01-01), Poletto et al.
patent: 5410241 (1995-04-01), Cecil
"Initial Release: LT1580/LT1580-2.5: 7A, Very Low Dropout Regulator," Linear Technology, Inc., Milpitas, California, pp. 1-4, Jun. 1995.

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