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Hi,
could anybody please suggest me a good and possibly cheap (it's not for
a one-off) small, nice, step down SMPS IC with wide input voltage range
(say 6..40 or more V) out =3D 5V (even better, dual out 5V / 12V ) 100+mA?


40V+ input narrows the range and "cheap" seems to vanish.

__________________

LM5085
$1.24/1000 Digikey
$1.07/10000 Digikey

Reasonably nice IC if $1+ OK.
External FET (more $)
4.5 - 75 Vin
External FET
Freq prog to 1 Mhz.
95% at 500 mA out at 7V in
80%+ at higher Iouts at most Vins.
MSOP-8, LLP-8 (3mm x 3mm)


http://www.national.com/ds/LM/LM5085.pdf


___________________

Worsish in some ways but aimed at efficiency at lower loads with PFM
Graphs on pages 23 + 24 would give you a fright when you first met them
being implemented in action.


eg Infineon offer eg  TLE 629

TLE6389-3G V50CT-ND<http://search.digikey.com/us/en/products/TLE6389-3G%20V=
50/TLE6389-3G%20V50CT-ND/2231231>

However, as that uses an external FET switch a little playing could extend
the range indefinitely

___________________

But, there's always the time honoured MC34063 which has a switch abs max
voltage of 40V stand alone and as high as you like with external FET.
Only 100 kHz ish so larger L's but very minimal parts count up to ~~~ 40V.
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DAT=
ASHEET/CD00001232.pdf

See figs 15+16 for minimum parts buck cct. and PCB layout
IC. 3R, 1C, D, L + 2 x filter caps.

Not marvellous efficiency at low Vin due to non saturating darlington
driver but can add external FET if desired.

$0.19 / 1000 Digikey
$0.124/50,000 Digikey
$US0.05 - 0.10 / China (Motorola licenced copy)

_______________________

"My" "God's switching Regulator" [tm] will do this with 3 jellybean
transistors 4R,  1D. 1L, 1Z, 2 x filter caps.

Attached is someone's apparently parallel reincarnation of my design.

That's from here : http://sound.westhost.com//appnotes/an006.htm

With a constant current version here
http://sound.westhost.com//appnotes/an003.htm

I've had versions of this that ran at Vin from 12V to 200V and Vout =3D 12V=
..
Below 12V Vout tracked Vin less Q3 saturation.
There are 10,000++ of these "out there" so ignore people who say it won't
work :-).
[It's actually a 'hysteretic converter' but I had not met them when the
concept dropped/was dropped fully formed into my mind in time of need :-).]





                 Russell

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