Low voltage regulator having power down switch

Details Low voltage regulator having power down switch Low voltage regulator having power down switch

1997-02-07

1999-01-26

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

257195, G05F 1565

Patent

active

058642269

ABSTRACT:
A low voltage regulator integrated circuit for high speed/high frequency circuits incorporates a field effect transistor switch with a heterojunction bipolar transistor in order to reduce voltage requirements of the circuit and allow lower power voltages to be regulated. A first field effect transistor connects an unregulated power input terminal to a regulated power output terminal with a bias circuit including the heterojunction bipolar transistor provided to maintain conductance of the field effect transistor in regulating a voltage on the output terminal. A second field effect transistor can be included in the circuit to provide a power down or power saving mode of operation. An input voltage range of the voltage regulator is reduced from 3-3.5 V to 2-2.3 V using the integrated field effect transistor/heterojunction bipolar transistor device structure.

REFERENCES:
patent: 4536699 (1985-08-01), Baker
patent: 4560918 (1985-12-01), Callen
patent: 5012318 (1991-04-01), Honjo
patent: 5293084 (1994-03-01), Itoh et al.
patent: 5422501 (1995-06-01), Bayraktaroglu

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