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Low current consumption voltage regulator Disclosure Number: IPCOM000035667D
Original Publication Date: 2005-Feb-25
Included in the Prior Art Database: 2005-Feb-25

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The technical problem that has to be solved by this idea is to produce a regulated voltage from a wide range input voltage with very low quiescent current. In many applications like i.e. the generation of an internal supply in an integrated IC (Integrated Circuit) is not important that the regulator voltage has high performances but can be very important that the current consumption is low. Up to now, one way to solve this problem is shown in Fig. 1. This circuit consists in a voltage reference and a follower. The output voltage is Vref - Vgsq1. The Vref can be generated with a zener diode, with some diodes biased in forward direction or with a band gap. The disadvantages of this solution are that the output voltage has a poor precision and that a continuous current is always flowing. The quiescent current can be reduced by increasing the resistor R1 but this increases the area. An other way to generate a reference is to use a voltage regulator but also in this case a continuous quiescent current is unavoidable.