Compact low dropout voltage regulator using enhancement and depl

Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...

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323273, G05F 316

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active

06005378&

ABSTRACT:
A low dropout (LDO) voltage regulator for generating a well-regulated voltage which is stable with variations in load resistance and in supply voltage includes a non-complex reference voltage generator. In the preferred embodiment, the reference voltage generator is configured to function as an amplifier as well as a reference voltage generator. In one embodiment, a single gain stage LDO voltage regulator utilizes the single function reference voltage generator which is compared to a feedback voltage that is proportional to an output voltage. The feedback voltage and the reference voltage control two currents which are used to generate a control signal to a pass transistor. Depending on the supply voltage, the pass transistor either increases or decreases the current to an output terminal to raise or lower the output voltage until the output voltage equals the regulated voltage. In another embodiment, a two gain stage LDO voltage regulator utilizes the dual function reference voltage generator. The two gain stage LDO voltage regulator compares a gained signal instead of the reference voltage with the feedback voltage to generate the control signal to the pass transistor.

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patent: 5563501 (1996-10-01), Chan

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