5V Regulator Ultra Low-Power Circuit by http://www.extremecircuits.net
The accepted cesspool of the regulator is minute compared with that of, say, a 78L05: at an ascribe voltage of 9 V and open-circuit output, it is aloof beneath 50 µA. The ambit consists of a aboveboard bandgap advertence based on T1 and IC1, followed by an amplifier formed by IC2 and T1. The advertence voltage is about 1.22 V, which is aloft by IC2 to 5 V. The achievement voltage can be set to absolutely 5 V with P1. The ascribe voltage may lie amid 6.5 V and 30 V. The best achievement accepted with the present agreement and basic ethics as defined is about 10 mA. For optimum performance, T1a and T1b charge to be identical, which is why a bifold transtor Type MAT02 is used. Other types that may be acclimated are the MAT01, SSM2210 or LM394. In principle, two accepted BC transistors may be used, provided they are called for identical beginning voltage. Circuits IC1 and IC2 are programmable op amps Type OP22. In the case of IC2 this has the account that the aiguille achievement accepted can be set readily by altering the accumulation accepted to the op amp with R9. The akin of the accepted may be amid 500 nA and 400 µA. Bear in apperception that a beyond achievement accepted requires the use of a added awful rated achievement transistor. Filter R6-C1 prevents any affected pulses extensive the ascribe of IC2. Capacitor C2 improves the adherence of the regulator, decidedly with best beating loading. Note that the ambit has a aerial resistance, so that it is appropriate to abode it in a buried asylum to anticipate causeless alluring and electromagnetic arrest actuality accompanying to the circuit. The regulator was activated with a absolute amount accepted of 1 mA on which was superimposed a square-wave accepted of 10 mA. The analysis after-effects are abbreviated in the table, in which Ig represents the accepted fatigued by the circuit.
