Low-loss voltage regulator

The voltage regulator in portable, batteryopera ted equipment must have minimum dissipation, good temperature stability, and be able to deliver an adequate current. These requirements are met by the IRF9530 MOSFET series regulator from Precision Monolithics Ine. (PMI). One of its main attributes is the low drive current required: the two Type OP90 opamps that drive it and at the same time generate the reference voltage draw only 20 µA.