Micropower Linear Voltage Regulators
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The ADM663A/ADM666A contains a micropower bandgap reference voltage source; an error amplifier, A1; three comparators, C1, C2, C3, and a series pass output transistor. A P-channel FET and an NPN transistor are used on the ADM663A while the ADM666A uses an NPN output transistor.
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http://www.analog.com/UploadedFiles/
Application_Notes/66728469AN-392.pdf
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