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

On 24 May 2005 11:18:51 -0700, "Bo-Ming Tong" <cyberstudio@xxxxxxx>
wrote:

>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.
>

A surplus error amplifier could be used to modify your presently-used
circuit, by driving the summing point through an impedance much larger
than that of the voltage divider that is already in place. This would
only 'trim' the voltage.

Perhaps this might not use much more real estate.

RL
.

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