What is the maximum input voltage for an LDO under specified conditions?

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The discussion centers on determining the maximum input voltage for a low-dropout regulator (LDO) under specific conditions, including an ambient temperature of 85°C, an output voltage of 1.05V, and an output current of 600mA. Key parameters include the thermal resistance of the package and the maximum junction temperature of 150°C. Participants are tasked with calculating the maximum input voltage that maintains these operational conditions. The potential answers range from 0V to 4.56V. The focus is on applying thermal and electrical equations to arrive at the correct maximum input voltage.
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Homework Statement


Tambient = 85degC, Vout = 1.05V, Iout = 600mA, 3x3 package with thetaJA = 40 deg. Celsius /W, Tjmax = 150 deg. Celsius...What is the max input voltage that the LDO can support while maintaining these conditions?


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The Attempt at a Solution


Answer is one of the following answers
a) 0 b) 3.2v c) 3.6 d)4.2v e) 4.56
 
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