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The MAX603/MAX604 low-dropout, low quiescent current,linear regulators supply 5V, 3.3V, or an adjustableoutput for currents up to 500mA. They are available in a1.8W SO package. Typical dropouts are 320mV at 5Vand 500mA, or 240mV at 3.3V and 200mA. Quiescentcurrents are 15μA typ and 35μA max. Shutdown turnsoff all circuitry and puts the regulator in a 2μA off mode.A unique protecTIon scheme limits reverse currentswhen the input voltage falls below the output. Other featuresinclude foldback current limiTIng and thermaloverload protecTIon.The output is preset at 3.3V for the MAX604 and 5V forthe MAX603. In addiTIon, both devices employ DualMode™ operation, allowing user-adjustable outputsfrom 1.25V to 11V using external resistors. The inputvoltage supply range is 2.7V to 11.5V.The MAX603/MAX604 feature a 500mA P-channelMOSFET pass transistor. This transistor allows thedevices to draw less than 35μA over temperature, independentof the output current. The supply currentremains low because the P-channel MOSFET pass transistordraws no base currents (unlike the PNP transistorsof conventional bipolar linear regulators). Also,when the input-to-output voltage differential becomessmall, the internal P-channel MOSFET does not sufferfrom excessive base current losses that occur with saturatedPNP transistors.________________________Applications5V and 3.3V Regulators1.25V to 11V Adjustable RegulatorsBattery-Powered DevicesPagers and Cellular PhonesPortable InstrumentsSolar-Powered Instruments
