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LT1084MK Datasheet(PDF) 7 Page - Linear Technology |
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LT1084MK Datasheet(HTML) 7 Page - Linear Technology |
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7 / 16 page  7 LT1083/LT1084/LT1085 108345fe BLOCK DIAGRAM APPLICATIONS INFORMATION The LT1083 family of three-terminal adjustable regulators is easy to use and has all the protection features that are expected in high performance voltage regulators. They are short-circuit protected, and have safe area protection as well as thermal shutdown to turn off the regulator should the junction temperature exceed about 165 °C. These regulators are pin compatible with older three- terminal adjustable devices, offer lower dropout voltage and more precise reference tolerance. Further, the refer- ence stability with temperature is improved over older types of regulators. The only circuit difference between using the LT1083 family and older regulators is that this new family requires an output capacitor for stability. Stability The circuit design used in the LT1083 family requires the use of an output capacitor as part of the device frequency compensation. For all operating conditions, the addition of 150 µF aluminium electrolytic or a 22µF solid tantalum on the output will ensure stability. Normally, capacitors much smaller than this can be used with the LT1083. Many different types of capacitors with widely varying charac- teristics are available. These capacitors differ in capacitor tolerance (sometimes ranging up to ±100%), equivalent series resistance, and capacitance temperature coeffi- cient. The 150 µF or 22µF values given will ensure stability. When the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. The value of 22 µF tantalum or 150µF aluminum covers all cases of bypassing the adjustment terminal. Without bypassing the adjustment terminal, smaller ca- pacitors can be used with equally good results and the table below shows approximately what size capacitors are needed to ensure stability. Recommended Capacitor Values INPUT OUTPUT ADJUSTMENT 10 µF10µF Tantalum, 50µF Aluminum None 10 µF22µF Tantalum, 150µF Aluminum 20 µF – + THERMAL LIMIT VADJ VOUT 1083/4/5 ADJ BD VIN |
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