ADP163 - Why is there an output voltage limitation of 4.2V for the adjustable version?

Question

I want to use the ADP163 LDO for output voltages greater than 4.2V. 
 The input voltage range is 2.2V to 5.5V. The maximum drop-out voltage is 225mV (TSOT-package) @ 150mA and full temperature range (= worst case scenario). 
 If the input voltage is e.g. 5.2V and the desired output voltage is e.g. 4.8V why shouldn't this be possible? 
 What does cause the limitation to 4.2V for the allowed output voltage? Is this information in the datasheet correct (ADP160-163 datasheet Rev. H, page 12) ? 
 Your comment is highly appreciated. Thanks in advance ! 
 
 Regards, Ferdinand.

tonie · Accepted Answer

Hello Karl, the limitation is design related constraints rather than a fundamental circuit limitation. The 4.2V limit ensures proper operation across full input voltage range. This also may be imposed by internal circuitry's voltage headroom requirements. Best approach is to look for different liar regulators from our website that will meet your required output voltage.)

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ADP163 - Why is there an output voltage limitation of 4.2V for the adjustable version?

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