Regulator with a low drop-out voltage

Details Regulator with a low drop-out voltage Regulator with a low drop-out voltage

1983-11-18

1985-09-24

Wong, Peter S.

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

323274, 307 44, 307 66, G05F 500

Patent

active

045435227

ABSTRACT:
A regulator with a low drop-out voltage receiving on a first terminal a supply voltage and supplying on its output terminal a regulated voltage. The input and output terminals are connected on the one hand, by a first branch incorporating a pnp transistor, and on the other hand by a second branch incorporating in series a resistor and a second pnp transistor, whose emitter is connected to a storage capacitor charged by the resistor. Thus, when the supply voltage drops below the charging voltage of the capacitor, it is the second pnp transistor which conducts and connects the capacitor to the output terminal.

REFERENCES:
patent: 3414802 (1968-12-01), Harrigan et al.
patent: 4209710 (1980-06-01), Quarton
patent: 4342922 (1982-08-01), Dimassimo
patent: 4354118 (1982-10-01), Spencer
Valone, Thomas, "Protected Regulator has Lowest Dropout Voltage", Electronics/Apr. 24, 1980, p. 130.

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