On Fri, 20 May 2022 18:33:15 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>l�rdag den 21. maj 2022 kl. 03.21.09 UTC+2 skrev rbowman: >> On 05/20/2022 11:25 AM, Phil Hobbs wrote: >> > <https://www.maximintegrated.com/en/products/power/linear-regulators/MAXESSENTIAL02EP.html> >> > >> > >> > Datasheet: >> > <https://datasheets.maximintegrated.com/en/ds/MAXESSENTIAL02EP.pdf> >> > >> > A set of _nine_ nice-looking eval boards for their new analog-focused, >> > low quiescent power switching regulators, all for $49 in a nice plastic >> > case and all. >> > >> > Dunno if I'm brave enough to use a Maxim part yet, but some of those >> > look vaguely interesting. >> Why? Maxim has been around for a long time. Maxim ate a lot of companies >> but there's always a bigger fish in the pond. > >Maxim is infamous for teasing with datasheets and samples, >but when it come to buying for production you are not getting any >unless, I guess, you need millions so they can be bothered to actually make someI used about 3000 of MAX9690. They discontinued it without notice, and then they started failing in the field. We had to replace all of them. We had to build our own: https://www.dropbox.com/s/y5n23tfd0adwao5/MAX9690_Kluge.JPG?raw=1 -- Anybody can count to one. - Robert Widlar
Is Maxim now AD? If so, this set of SMPS eval boards is interesting
Started by ●May 20, 2022
Reply by ●May 21, 20222022-05-21
Reply by ●May 21, 20222022-05-21
On 05/20/2022 07:33 PM, Lasse Langwadt Christensen wrote:> lørdag den 21. maj 2022 kl. 03.21.09 UTC+2 skrev rbowman: >> On 05/20/2022 11:25 AM, Phil Hobbs wrote: >>> <https://www.maximintegrated.com/en/products/power/linear-regulators/MAXESSENTIAL02EP.html> >>> >>> >>> Datasheet: >>> <https://datasheets.maximintegrated.com/en/ds/MAXESSENTIAL02EP.pdf> >>> >>> A set of _nine_ nice-looking eval boards for their new analog-focused, >>> low quiescent power switching regulators, all for $49 in a nice plastic >>> case and all. >>> >>> Dunno if I'm brave enough to use a Maxim part yet, but some of those >>> look vaguely interesting. >> Why? Maxim has been around for a long time. Maxim ate a lot of companies >> but there's always a bigger fish in the pond. > > Maxim is infamous for teasing with datasheets and samples, > but when it come to buying for production you are not getting any > unless, I guess, you need millions so they can be bothered to actually make some >Ah, the Motorola problem. If the auto industry placed an order for millions you went to the end of the line. We're back to the mid-80's where the salesmen would estimate delivery out a year or more with a straight face.
Reply by ●May 21, 20222022-05-21
On Fri, 20 May 2022 22:48:21 -0600, rbowman <bowman@montana.com> wrote:>On 05/20/2022 07:33 PM, Lasse Langwadt Christensen wrote: >> l�rdag den 21. maj 2022 kl. 03.21.09 UTC+2 skrev rbowman: >>> On 05/20/2022 11:25 AM, Phil Hobbs wrote: >>>> <https://www.maximintegrated.com/en/products/power/linear-regulators/MAXESSENTIAL02EP.html> >>>> >>>> >>>> Datasheet: >>>> <https://datasheets.maximintegrated.com/en/ds/MAXESSENTIAL02EP.pdf> >>>> >>>> A set of _nine_ nice-looking eval boards for their new analog-focused, >>>> low quiescent power switching regulators, all for $49 in a nice plastic >>>> case and all. >>>> >>>> Dunno if I'm brave enough to use a Maxim part yet, but some of those >>>> look vaguely interesting. >>> Why? Maxim has been around for a long time. Maxim ate a lot of companies >>> but there's always a bigger fish in the pond. >> >> Maxim is infamous for teasing with datasheets and samples, >> but when it come to buying for production you are not getting any >> unless, I guess, you need millions so they can be bothered to actually make some >> > >Ah, the Motorola problem. If the auto industry placed an order for >millions you went to the end of the line. We're back to the mid-80's >where the salesmen would estimate delivery out a year or more with a >straight face. >Government agencies are now hogging FPGAs. We make stuff for a giant semi fab company, and we can't get FPGAs. They are using all their clout to get us parts, but even they are second in line. If we can't ship, they can't make fab lines, so people can't make chips. That logic isn't enough to get us parts. -- Anybody can count to one. - Robert Widlar
Reply by ●May 21, 20222022-05-21
On 05/21/2022 08:25 AM, jlarkin@highlandsniptechnology.com wrote:> On Fri, 20 May 2022 22:48:21 -0600, rbowman <bowman@montana.com> > wrote: > >> On 05/20/2022 07:33 PM, Lasse Langwadt Christensen wrote: >>> l�rdag den 21. maj 2022 kl. 03.21.09 UTC+2 skrev rbowman: >>>> On 05/20/2022 11:25 AM, Phil Hobbs wrote: >>>>> <https://www.maximintegrated.com/en/products/power/linear-regulators/MAXESSENTIAL02EP.html> >>>>> >>>>> >>>>> Datasheet: >>>>> <https://datasheets.maximintegrated.com/en/ds/MAXESSENTIAL02EP.pdf> >>>>> >>>>> A set of _nine_ nice-looking eval boards for their new analog-focused, >>>>> low quiescent power switching regulators, all for $49 in a nice plastic >>>>> case and all. >>>>> >>>>> Dunno if I'm brave enough to use a Maxim part yet, but some of those >>>>> look vaguely interesting. >>>> Why? Maxim has been around for a long time. Maxim ate a lot of companies >>>> but there's always a bigger fish in the pond. >>> >>> Maxim is infamous for teasing with datasheets and samples, >>> but when it come to buying for production you are not getting any >>> unless, I guess, you need millions so they can be bothered to actually make some >>> >> >> Ah, the Motorola problem. If the auto industry placed an order for >> millions you went to the end of the line. We're back to the mid-80's >> where the salesmen would estimate delivery out a year or more with a >> straight face. >> > > Government agencies are now hogging FPGAs. > > We make stuff for a giant semi fab company, and we can't get FPGAs. > They are using all their clout to get us parts, but even they are > second in line. > > If we can't ship, they can't make fab lines, so people can't make > chips. That logic isn't enough to get us parts. > > >What are they doing with them? I knew the defense industry used quite a few but not all of them. NSA building bigger and better facial recognition tools?
Reply by ●May 21, 20222022-05-21
> > > > TPS54302 is pretty good. > > I've got that in my notes from your previous recommendation, but haven't > tried it yet. > > Cheers > > Phil Hobbs > --https://www.ti.com/product/TPS54302 "4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter" "EMI Friendly"? .. could mean different things. EMI is usually not our friend! Barney the purple dinosaur is editing spec sheets
Reply by ●May 21, 20222022-05-21
On Sat, 21 May 2022 10:57:00 -0700 (PDT), Rich S <richsulinengineer@gmail.com> wrote:>> > >> > TPS54302 is pretty good. >> >> I've got that in my notes from your previous recommendation, but haven't >> tried it yet. >> >> Cheers >> >> Phil Hobbs >> -- > >https://www.ti.com/product/TPS54302 >"4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter" > >"EMI Friendly"? .. could mean different things. > EMI is usually not our friend! > Barney the purple dinosaur is editing spec sheetsIt does radical spread-spectrum switching. That smears the spectrum and helps it pass FCC/CE radiated tests, but it still makes spikes that can get into analog stuff. But it is pretty good about that too; Trr is about 20 ns, could be worse. https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1 https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1 The spectrum shaping must be done right, because all that duty-cycle thrashing doesn't make noise on the DC output. It's rated for 3 amps out but gets pretty hot up there, and you can't heat sink the SOT23 package much. I use it up to 2 amps. Not bad for 99 cents. -- Anybody can count to one. - Robert Widlar
Reply by ●May 21, 20222022-05-21
On Sat, 21 May 2022 11:31:38 -0700, jlarkin@highlandsniptechnology.com wrote:>On Sat, 21 May 2022 10:57:00 -0700 (PDT), Rich S ><richsulinengineer@gmail.com> wrote: > >>> > >>> > TPS54302 is pretty good. >>> >>> I've got that in my notes from your previous recommendation, but haven't >>> tried it yet. >>> >>> Cheers >>> >>> Phil Hobbs >>> -- >> >>https://www.ti.com/product/TPS54302 >>"4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter" >> >>"EMI Friendly"? .. could mean different things. >> EMI is usually not our friend! >> Barney the purple dinosaur is editing spec sheets > >It does radical spread-spectrum switching. That smears the spectrum >and helps it pass FCC/CE radiated tests, but it still makes spikes >that can get into analog stuff. But it is pretty good about that too; >Trr is about 20 ns, could be worse. > >https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1 > >https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1 > >The spectrum shaping must be done right, because all that duty-cycle >thrashing doesn't make noise on the DC output. > >It's rated for 3 amps out but gets pretty hot up there, and you can't >heat sink the SOT23 package much. I use it up to 2 amps. > >Not bad for 99 cents.It should be possible to make a plus-to-minus converter with that one. Gotta try that. It won't (legally) do +24 to -5, but it's close. -- Anybody can count to one. - Robert Widlar
Reply by ●May 21, 20222022-05-21
On Sat, 21 May 2022 13:19:34 -0700, jlarkin@highlandsniptechnology.com wrote:>On Sat, 21 May 2022 11:31:38 -0700, jlarkin@highlandsniptechnology.com >wrote: > >>On Sat, 21 May 2022 10:57:00 -0700 (PDT), Rich S >><richsulinengineer@gmail.com> wrote: >> >>>> > >>>> > TPS54302 is pretty good. >>>> >>>> I've got that in my notes from your previous recommendation, but haven't >>>> tried it yet. >>>> >>>> Cheers >>>> >>>> Phil Hobbs >>>> -- >>> >>>https://www.ti.com/product/TPS54302 >>>"4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter" >>> >>>"EMI Friendly"? .. could mean different things. >>> EMI is usually not our friend! >>> Barney the purple dinosaur is editing spec sheets >> >>It does radical spread-spectrum switching. That smears the spectrum >>and helps it pass FCC/CE radiated tests, but it still makes spikes >>that can get into analog stuff. But it is pretty good about that too; >>Trr is about 20 ns, could be worse. >> >>https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1 >> >>https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1 >> >>The spectrum shaping must be done right, because all that duty-cycle >>thrashing doesn't make noise on the DC output. >> >>It's rated for 3 amps out but gets pretty hot up there, and you can't >>heat sink the SOT23 package much. I use it up to 2 amps. >> >>Not bad for 99 cents. > >It should be possible to make a plus-to-minus converter with that one. >Gotta try that. > >It won't (legally) do +24 to -5, but it's close.Actually, abs max is 30, so it might. -- Anybody can count to one. - Robert Widlar
Reply by ●May 22, 20222022-05-22
rbowman wrote:> On 05/20/2022 07:33 PM, Lasse Langwadt Christensen wrote: >> lørdag den 21. maj 2022 kl. 03.21.09 UTC+2 skrev rbowman: >>> On 05/20/2022 11:25 AM, Phil Hobbs wrote: >>>> <https://www.maximintegrated.com/en/products/power/linear-regulators/MAXESSENTIAL02EP.html> >>>> >>>> >>>> >>>> Datasheet: >>>> <https://datasheets.maximintegrated.com/en/ds/MAXESSENTIAL02EP.pdf> >>>> >>>> A set of _nine_ nice-looking eval boards for their new analog-focused, >>>> low quiescent power switching regulators, all for $49 in a nice plastic >>>> case and all. >>>> >>>> Dunno if I'm brave enough to use a Maxim part yet, but some of those >>>> look vaguely interesting. >>> Why? Maxim has been around for a long time. Maxim ate a lot of companies >>> but there's always a bigger fish in the pond. >> >> Maxim is infamous for teasing with datasheets and samples, >> but when it come to buying for production you are not getting any >> unless, I guess, you need millions so they can be bothered to actually >> make some >> > > Ah, the Motorola problem. If the auto industry placed an order for > millions you went to the end of the line. We're back to the mid-80's > where the salesmen would estimate delivery out a year or more with a > straight face. > >I never had MOTA do what Maxim does. The worst thing I encountered from them was the way they derated their otherwise very nice MC35084 quad decompensated FET op amp. The GBW and slew rate specs decreased by _half_ between the preliminary and production datasheets. That was very inconvenient, because at the time (1987) there weren't any low cost FET amps that fast. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
