[time-nuts] ULN regulator with more current capability than LT3042?

[Gerhard Hoffmann]

Am 18.03.2018 um 21:13 schrieb John Ackermann N8UR:
> Reviving the conversation about superb voltage regulators, I am 
> looking for one to run the analog and PLL bits of a high performance 
> frequency synthesizer chip.
>
> The current drain looks to be about 160-180 mA at 1.8 V, which is 
> uncomfortably close to the limit for the LT3042 (200 mA).  The 
> manufacturer's evaluation board uses a MAX8869, which appears to be 
> nowhere in the LT3042's league, but will source 1 A.
>
> Any recommendations for a 1.8 V regulator a little beefier than the 
> LT3042, but with similar noise performance?
>


Use the LT3042 with an external power transistor, such as D44VH10G:

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https://www.flickr.com/photos/137684711@N07/29197476530/in/album-72157662535945536/ 
 >

Performance is about the same as the LT3042 alone. That is exactly the 
circuit from the data sheet.

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https://www.flickr.com/photos/137684711@N07/29452163806/in/album-72157662535945536/ 
 >

The layout for Altium Designer is available.

The LT3045 is not so much bigger that it makes a real progress. The 
currents are valid only
for tiny voltage drops anyway.

regards,
Gerhard