Re: Ever smaller DC-DC converter modules by TI

Jan Panteltje <alien@comet.invalid> wrote:

On a sunny day (Sun, 1 Sep 2024 17:43:26 +0200) it happened Arie de Muijnck
<noreply@ademu.nl> wrote in <nnd$2f75283c$0bf25191@b9829d5a22e7a1d0>:
 

On 2024-09-01 17:29, Arie de Muijnck wrote:

On 2024-09-01 16:35, john larkin wrote:

Jan Panteltje <alien@comet.invalid> wrote:

Ever smaller DC-DC converter modules by TI:
 
https://www.electronicdesign.com/technologies/power/article/55134121/electronic-design-tis-magnetic-materials-and-packaging-magic-help-slash-dc-dc-module-size-even-further
This innovation is based largely, but not entirely,
on advances in magnetic materials,
and it didnΓÇÖt come quickly.
Noted Jeff Morroni, director of power management research and development
at TI's Kilby Labs,
 
For example:
1.8 to 5.5V in to 5.5V out at 5.5A size 2.5 x 2.6 mm boost module
More examples in link.
 

 
1W isolated 5 -> 3.3V, 4x5x1 mm, SS, *76 MHz* switching frequency, for
$1.50 @ 1ku?
 
Potentially pretty cool!
 
Cheers
 
Phil Hobbs
 

 
I noticed in the datasheet to avoid disabling it under full load.
To me that reads the shrapnel would reach the ceiling...
 
Arie

 
After better reading the datasheet of the boost converter, TPSM81033,
most interesting for me right now.
And not disabling but removing the input voltage. Like with the good old
LM78xx regulators.
 
"
Device Limitations (intended to be removed for final material):
1. Inductor current limit function is not optimized. TI don't recommend
to use TPSM81033 at the
condition that the input current is higher than 5A. Final material is
expected to improve the current
limit function.
2. TPSM81033 doesn't support to remove input voltage at heavy load. TI recommend to remove
input voltage at no load, or connect EN to GND first with load and then
remove input voltage. Final
material is expected to support remove input voltage at heavy load.

"
 
That sure is a big limitation!
 

I’ll certainly be reading the datasheet carefully before using the part,
but I expect that it’s not a big worry in real life.

You’re going to have some sort of reservoir cap on the input, and with a 76
MHz switching frequency, its discharge will be nice and smooth. 

It would take work to cut off the input supply fast enough to cause
inductive problems.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics