Circuit to reduce dropout voltage in a low dropout voltage regul

Details Circuit to reduce dropout voltage in a low dropout voltage regul Circuit to reduce dropout voltage in a low dropout voltage regul

1993-03-25

1995-04-25

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323312, 323314, G05F 316

Patent

active

054102413

ABSTRACT:
An integrated circuit voltage regulator employs a PNP pass transistor to produce a low dropout voltage. Saturation in the pass transistor produces excessive substrate current which appears in the form of wasted current which lowers the regulator efficiency. A current conducted by the sat catcher circuit is employed to avoid pass transistor saturation. The sat catcher is controlled dynamically so the dropout voltage is minimized and the voltage regulator maintains good performance at high regulator output currents.

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"LM2935 Low Dropout Dual Regulator," General Purpose Linear Devices Databook, 1989, pp. 1-226 through 1-233.
"LM2937 500 mA Low Dropout Regulator," Nov. 1991, pp. 1 through 6.
"LM2940 1A Low Dropout Regulator," General Purpose Linear Devices Databook, 1989, pp. 1-239 through 1-243.
"LP2950/LP2950AC/LP2950C 5V and LP2951/LP2951AC/LP2951C Adjustable Micropower Voltage Regulators," General Purpose Linear Devices Databook, 1989, pp. 1-345 through 1-356.
"LP2952/LP2952A/LP2953/LP2953A Adjustable Micropower Low-Dropout Voltage Regulators," Feb. 1991, pp. 1 through 15.
"LP2954/LP2954A 5V Micropower Low-Dropout Voltage Regulators," Jan. 1991, pp. 1 through 8.

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