Pls help me find extremely small 1:1 voltage-tracking regulator

I am developing a product which requires interfacing my 5V circuit to
another 5V circuit whose power supply I have no control over, which
varies from around 4.75V to 5.25V in practice.

I wish to build my circuit's power supply to track the other circuit's
power supply instead of a fixed 5V. So, I am looking for a regulator
with an external voltage reference instead of an internal one. I need
only 40mA, and I have found ON Semiconductor CS8182 (SOIC-8) and
Infineon TLE4250G (SCT-595) for that purpose. However, they are not
stocked by suppliers such as Mouser and Digikey, and I have learned
from posts in this newgroup that I should never design-in
hard-to-source components. Is there any other tracking LDO you could
think of, which is extremely small and made by a more commonly
available manufacturer such as TI ?

I also found a lot of DDR termination tracking controllers but they are
all 1:2 and they are larger than my very constrained space would allow.

Thanks in advance !

.

Relevant Pages

  • Re: Pls help me find extremely small 1:1 voltage-tracking regulator
    ... >I am developing a product which requires interfacing my 5V circuit to ... >another 5V circuit whose power supply I have no control over, ... >from posts in this newgroup that I should never design-in ... >I also found a lot of DDR termination tracking controllers but they are ...
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    ... >I am developing a product which requires interfacing my 5V circuit to ... >another 5V circuit whose power supply I have no control over, ... >with an external voltage reference instead of an internal one. ... >I also found a lot of DDR termination tracking controllers but they are ...
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