• Is Maxim now AD? If so, this set of SMPS eval boards is interesting

    From Phil Hobbs@21:1/5 to All on Fri May 20 13:25:38 2022
    <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.

    Cheers

    Phil
    --
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Lasse Langwadt Christensen@21:1/5 to All on Fri May 20 11:18:03 2022
    yes, since august last year, https://www.analog.com/en/about-adi/maxim-integrated-acquisition.html

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to Lasse Langwadt Christensen on Fri May 20 14:51:32 2022
    Lasse Langwadt Christensen wrote:
    yes, since august last year, https://www.analog.com/en/about-adi/maxim-integrated-acquisition.html


    I know AD bought them--what I'm getting at is, "Has Maxim stopped acting
    like d*ckheads by continually cancelling recently-introduced products
    just when you're going into production?"

    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Fri May 20 12:27:23 2022
    On Fri, 20 May 2022 14:51:32 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Lasse Langwadt Christensen wrote:
    yes, since august last year, https://www.analog.com/en/about-adi/maxim-integrated-acquisition.html


    I know AD bought them--what I'm getting at is, "Has Maxim stopped acting
    like d*ckheads by continually cancelling recently-introduced products
    just when you're going into production?"

    Cheers

    Phil Hobbs

    Duckheads?

    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Fri May 20 12:26:41 2022
    On Fri, 20 May 2022 13:25:38 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> 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.

    Cheers

    Phil

    Those Maxim parts look redundant on the ex-LTC LTM modules. Analog
    owns both now.

    I hope they did a better job on switcher noise than Linear did.
    LTM8078 is ghastly. If you try the eval kit, maybe you could look at
    that.

    TPS54302 is pretty good.





    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to John Larkin on Fri May 20 16:26:56 2022
    John Larkin wrote:
    On Fri, 20 May 2022 13:25:38 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> 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.

    Cheers

    Phil

    Those Maxim parts look redundant on the ex-LTC LTM modules. Analog
    owns both now.

    I hope they did a better job on switcher noise than Linear did.
    LTM8078 is ghastly. If you try the eval kit, maybe you could look at
    that.

    That would be my primary interest. We've revamped our standard
    photoreceiver packaging to use a machined-from-solid brass box with a
    flat brass lid, communicating via feedthrough caps and a U.FL F to
    bulkhead SMA cable. All the switchers go in another board under the
    brass box, with a black powder-coated steel or aluminum lid, with a
    black plastic shroud covering the feedthrus and supporting a
    bulkhead-mount power jack. The lid can be soldered down if desired, for
    really tough EMI situations. Once we have the new models up on the
    website, I'll post a link.

    Turns out that with modern laser cutting and 3D printing, the whole
    works is cheaper than the Hammond box we were using, besides being
    dramatically better electrically and much much more bling with all that gold(ish) and black. (Free-cutting brass looks more like gold than
    yellow sheet brass does.)

    Simon unofficially calls the new version of our QL01 nanowatt
    photoreceiver the DK02, for Donna Karan. ;)

    The new boxes are good for fast APDs, SPADs, and MPPCs/SiPMs.

    Check out SendCutSend for some very interesting capabilities.

    TPS54302 is pretty good.

    I've got that in my notes from your previous recommendation, but haven't
    tried it yet.

    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Fri May 20 15:26:13 2022
    On Fri, 20 May 2022 16:26:56 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    John Larkin wrote:
    On Fri, 20 May 2022 13:25:38 -0400, Phil Hobbs
    <pcdhSpamMeSenseless@electrooptical.net> 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.

    Cheers

    Phil

    Those Maxim parts look redundant on the ex-LTC LTM modules. Analog
    owns both now.

    I hope they did a better job on switcher noise than Linear did.
    LTM8078 is ghastly. If you try the eval kit, maybe you could look at
    that.

    That would be my primary interest. We've revamped our standard
    photoreceiver packaging to use a machined-from-solid brass box with a
    flat brass lid, communicating via feedthrough caps and a U.FL F to
    bulkhead SMA cable. All the switchers go in another board under the
    brass box, with a black powder-coated steel or aluminum lid, with a
    black plastic shroud covering the feedthrus and supporting a
    bulkhead-mount power jack. The lid can be soldered down if desired, for >really tough EMI situations. Once we have the new models up on the
    website, I'll post a link.

    Turns out that with modern laser cutting and 3D printing, the whole
    works is cheaper than the Hammond box we were using, besides being >dramatically better electrically and much much more bling with all that >gold(ish) and black. (Free-cutting brass looks more like gold than
    yellow sheet brass does.)

    Simon unofficially calls the new version of our QL01 nanowatt
    photoreceiver the DK02, for Donna Karan. ;)

    The new boxes are good for fast APDs, SPADs, and MPPCs/SiPMs.

    Check out SendCutSend for some very interesting capabilities.

    TPS54302 is pretty good.

    I've got that in my notes from your previous recommendation, but haven't >tried it yet.

    Cheers

    Phil Hobbs

    We did a couple of custom extrusions to replace the horrible Hammond
    boxes. We buy them blue anodized and blast all the artwork with a Boss
    laser.

    http://www.highlandtechnology.com/DSS/J736DS.shtml

    http://www.highlandtechnology.com/DSS/T130DS.shtml

    I'll be in truckee later this month. I could drop in on sendcutsend
    just for fun.

    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to John Larkin on Fri May 20 19:21:48 2022
    John Larkin wrote:
    On Fri, 20 May 2022 16:26:56 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    John Larkin wrote:
    On Fri, 20 May 2022 13:25:38 -0400, Phil Hobbs
    <pcdhSpamMeSenseless@electrooptical.net> 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.

    Cheers

    Phil

    Those Maxim parts look redundant on the ex-LTC LTM modules. Analog
    owns both now.

    I hope they did a better job on switcher noise than Linear did.
    LTM8078 is ghastly. If you try the eval kit, maybe you could look at
    that.

    That would be my primary interest. We've revamped our standard
    photoreceiver packaging to use a machined-from-solid brass box with a
    flat brass lid, communicating via feedthrough caps and a U.FL F to
    bulkhead SMA cable. All the switchers go in another board under the
    brass box, with a black powder-coated steel or aluminum lid, with a
    black plastic shroud covering the feedthrus and supporting a
    bulkhead-mount power jack. The lid can be soldered down if desired, for
    really tough EMI situations. Once we have the new models up on the
    website, I'll post a link.

    Turns out that with modern laser cutting and 3D printing, the whole
    works is cheaper than the Hammond box we were using, besides being
    dramatically better electrically and much much more bling with all that
    gold(ish) and black. (Free-cutting brass looks more like gold than
    yellow sheet brass does.)

    Simon unofficially calls the new version of our QL01 nanowatt
    photoreceiver the DK02, for Donna Karan. ;)

    The new boxes are good for fast APDs, SPADs, and MPPCs/SiPMs.

    Check out SendCutSend for some very interesting capabilities.

    TPS54302 is pretty good.

    I've got that in my notes from your previous recommendation, but haven't
    tried it yet.


    We did a couple of custom extrusions to replace the horrible Hammond
    boxes. We buy them blue anodized and blast all the artwork with a Boss
    laser.

    http://www.highlandtechnology.com/DSS/J736DS.shtml

    http://www.highlandtechnology.com/DSS/T130DS.shtml

    I'll be in truckee later this month. I could drop in on sendcutsend
    just for fun.

    Google says they're about 45 minutes from Truckee, so that might be a
    good use of half a day. They keep adding capabilities--they now do
    laser-cut steel (12 different alloys iirc) up to 12 mm thick, for cheap.
    Even titanium.

    It seems to be just the sort of thing American manufacturing used to be unequalled at--apply capital and ingenuity to become the low-cost, high
    quality producer even in a high-wage country.

    They're pretty focused on laser cutting and surface coatings--anything
    out of the plane costs extra. Simon knows a lot more about them than I
    do, and is a huge fan.

    It reminds me a bit of designing with MSI logic chips BITD--with some
    time and creativity you can make some pretty neat things while staying
    within the cheap zone.

    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From rbowman@21:1/5 to Phil Hobbs on Fri May 20 19:21:00 2022
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Lasse Langwadt Christensen@21:1/5 to All on Fri May 20 18:33:15 2022
    l√łrdag 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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to langwadt@fonz.dk on Fri May 20 21:08:35 2022
    On Fri, 20 May 2022 18:33:15 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

    lÝrdag 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

    I 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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From rbowman@21:1/5 to Lasse Langwadt Christensen on Fri May 20 22:48:21 2022
    On 05/20/2022 07:33 PM, Lasse Langwadt Christensen wrote:
    l√łrdag 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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to All on Sat May 21 07:25:53 2022
    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:
    lÝrdag 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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From rbowman@21:1/5 to jlarkin@highlandsniptechnology.com on Sat May 21 10:10:49 2022
    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:
    lÝrdag 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?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Rich S@21:1/5 to All on Sat May 21 10:57:00 2022

    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to richsulinengineer@gmail.com on Sat May 21 11:31:38 2022
    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.



    --

    Anybody can count to one.

    - Robert Widlar

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to All on Sat May 21 13:19:34 2022
    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

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  • From jlarkin@highlandsniptechnology.com@21:1/5 to All on Sat May 21 13:20:37 2022
    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

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  • From Phil Hobbs@21:1/5 to rbowman on Sun May 22 13:26:52 2022
    rbowman wrote:
    On 05/20/2022 07:33 PM, Lasse Langwadt Christensen wrote:
    l√łrdag 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

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