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

[Bob kb8tq]

Hi

Getting the heat off of the regulator package may have other benefits ( like improved
stability).  A lot depends on just where the heat goes in each case …..

Bob

> On Mar 18, 2018, at 4:41 PM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:
> 
> 
> 
> 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:
> 
> < 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.
> 
> < 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
> 
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