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 <dk...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
