[EE] Boost-LDO or charge pump that will take 3.3V and return 5.0V, 50 mA?

[Electron]

sorry, last message was sent with wrong subject, please delete it :(

---

Hi,
is there a wonder-IC that will take 3.3V in input and give 5.0V in output well
filtered (similar to a linear voltage regulator output), and that doesn't require
many components?

I was thinking about an integrated boost converter + LDO but the requirement of
an inductor plus n resistor and capacitors doesn't make me really enthusiast.

Maybe a more integrated IC?

Or a charge-pump based one?

Current requirement is low, 50mA would suffice.

Do you know / can you suggest a nice and not too expensive IC which requires as
few external components as possible? I've searched but I am more lost than before.

Thank you very much.

With kind regards,
Mario

[Richard Pytelewski]

Here's this on e-Bay (the price is right):


http://www.ebay.com/itm/5-MURATA-NKE0305S-Isolated-DC-DC-Converter-1W-SNGL-OUT-3-5V-Single-POWER-SIP-IC-/152746164697?epid=661305286&hash=item23906181d9:g:WGIAAOSw2GlXG2Af

[Loading Image...]<http://www.ebay.com/itm/5-MURATA-NKE0305S-Isolated-DC-DC-Converter-1W-SNGL-OUT-3-5V-Single-POWER-SIP-IC-/152746164697?epid=661305286&hash=item23906181d9:g:WGIAAOSw2GlXG2Af>

5 MURATA NKE0305S Isolated DC/DC Converter 1W SNGL OUT 3-5V Single POWER SIP IC | eBay<http://www.ebay.com/itm/5-MURATA-NKE0305S-Isolated-DC-DC-Converter-1W-SNGL-OUT-3-5V-Single-POWER-SIP-IC-/152746164697?epid=661305286&hash=item23906181d9:g:WGIAAOSw2GlXG2Af>
www.ebay.com
5pcs MURATA NKE0305S Isolated DC/DC Converters 1W SNGL OUT 3-5V Single. | eBay!







________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of Electron <***@infinito.it>
Sent: Tuesday, October 17, 2017 8:53 AM
To: Microcontroller discussion list - Public.
Subject: [EE] Boost-LDO or charge pump that will take 3.3V and return 5.0V, 50 mA?


sorry, last message was sent with wrong subject, please delete it :(

---

Hi,
is there a wonder-IC that will take 3.3V in input and give 5.0V in output well
filtered (similar to a linear voltage regulator output), and that doesn't require
many components?

I was thinking about an integrated boost converter + LDO but the requirement of
an inductor plus n resistor and capacitors doesn't make me really enthusiast.

Maybe a more integrated IC?

Or a charge-pump based one?

Current requirement is low, 50mA would suffice.

Do you know / can you suggest a nice and not too expensive IC which requires as
few external components as possible? I've searched but I am more lost than before.

Thank you very much.

With kind regards,
Mario

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[Neil]

I just did the same thing. 2.8V to 3.8V in, 5V out, 50mA. I used a
TPS61222DCK chip.
The chip, 1 inductor, 2 capacitors.
Waiting on parts to come in, so don't have test resuts yet. But my
experience with other TI switchers has been great and webench.com will
design/choose components for you.

https://www.digikey.com/product-detail/en/texas-instruments/TPS61222DCKR/296-39435-1-ND/5143383

Cheers,
-Neil.

Post by Electron
sorry, last message was sent with wrong subject, please delete it :(
---
Hi,
is there a wonder-IC that will take 3.3V in input and give 5.0V in output well
filtered (similar to a linear voltage regulator output), and that doesn't require
many components?
I was thinking about an integrated boost converter + LDO but the requirement of
an inductor plus n resistor and capacitors doesn't make me really enthusiast.
Maybe a more integrated IC?
Or a charge-pump based one?
Current requirement is low, 50mA would suffice.
Do you know / can you suggest a nice and not too expensive IC which requires as
few external components as possible? I've searched but I am more lost than before.
Thank you very much.
With kind regards,
Mario

[Electron]

That's my IC. Very nice, thanks.

Post by Neil
I just did the same thing. 2.8V to 3.8V in, 5V out, 50mA. I used a
TPS61222DCK chip.
The chip, 1 inductor, 2 capacitors.
Waiting on parts to come in, so don't have test resuts yet. But my
experience with other TI switchers has been great and webench.com will
design/choose components for you.
https://www.digikey.com/product-detail/en/texas-instruments/TPS61222DC
KR/296-39435-1-ND/5143383
Cheers,
-Neil.

Post by Electron
sorry, last message was sent with wrong subject, please delete it :(
---
Hi,
is there a wonder-IC that will take 3.3V in input and give 5.0V in

output well

Post by Electron
filtered (similar to a linear voltage regulator output), and that

doesn't require

Post by Electron
many components?
I was thinking about an integrated boost converter + LDO but the

requirement of

Post by Electron
an inductor plus n resistor and capacitors doesn't make me really enthusiast.
Maybe a more integrated IC?
Or a charge-pump based one?
Current requirement is low, 50mA would suffice.
Do you know / can you suggest a nice and not too expensive IC which

requires as

Post by Electron
few external components as possible? I've searched but I am more

lost than before.

Post by Electron
Thank you very much.
With kind regards,
Mario

--
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
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[Anthony Nixon]

Hi Neil,

I'd be interested to see how you go as I would like to power my HP
calculator emulator from 2 AAA cells. I5V and it only draws 25mA max
(Only if the PIC freezes and the multiplexed LEDs stay locked on one
digit)

This is the project I was using the PIC 18F47K40 for. This chip has
enough ROM to hold the original HP microcode so it can emulate 19
calculator models from the 70's era.

I've started to tame this chip finally and it seems to be behaving itself.

I can't say the same for MBLABX, at bit cumbersome and fiddly to use
at times. When I installed it, all my desktop icons shifted around,
and most of my web favourites disappeared along with stored passwords
for some web pages.

I wonder if the designers actually use it themselves to design a project :-)

cheers

Tony

Post by Neil
I just did the same thing. 2.8V to 3.8V in, 5V out, 50mA. I used a
TPS61222DCK chip.
The chip, 1 inductor, 2 capacitors.
Waiting on parts to come in, so don't have test resuts yet. But my
experience with other TI switchers has been great and webench.com will
design/choose components for you.
https://www.digikey.com/product-detail/en/texas-instruments/TPS61222DCKR/296-39435-1-ND/5143383
Cheers,
-Neil.

Post by Electron
sorry, last message was sent with wrong subject, please delete it :(
---
Hi,
is there a wonder-IC that will take 3.3V in input and give 5.0V in output well
filtered (similar to a linear voltage regulator output), and that doesn't require
many components?
I was thinking about an integrated boost converter + LDO but the requirement of
an inductor plus n resistor and capacitors doesn't make me really enthusiast.
Maybe a more integrated IC?
Or a charge-pump based one?
Current requirement is low, 50mA would suffice.
Do you know / can you suggest a nice and not too expensive IC which requires as
few external components as possible? I've searched but I am more lost than before.
Thank you very much.
With kind regards,
Mario

--
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist

[Forrest Christian (List Account)]

My favorite chip in this regard is the MCP1661 (or MCP1662). It can be
used in boost, or buck/boost configurations.

I'm using this in a buck-boost application where the voltage can range from
around 3V up to around 12Volts, and I need 3.3V out. In the buck/boost
mode you need a 2 coil coupled inductor. The datasheet would indicate
that it is only good up to 5.5V, but that can be solved with a simple shunt
regulator (aka resistor+zener diode) on the Vin pin.

I've also used the MCP16251 which looks very similar to the TPS61222DCK.
This was in a battery-powered application, and I used the shutdown
capability to act as the power off switch for the device. The power button
would pull the switch up to where it would turn on long enough for the
inverter to start and the microcontroller to hold the switch input up.

For the low current needs of the OP, I'd actually consider something like a
MCP1252. No inductors, just caps and resistors. Not sure about the
quality of the output though....

Post by Neil
I just did the same thing. 2.8V to 3.8V in, 5V out, 50mA. I used a
TPS61222DCK chip.
The chip, 1 inductor, 2 capacitors.
Waiting on parts to come in, so don't have test resuts yet. But my
experience with other TI switchers has been great and webench.com will
design/choose components for you.
https://www.digikey.com/product-detail/en/texas-
instruments/TPS61222DCKR/296-39435-1-ND/5143383
Cheers,
-Neil.

Post by Electron
sorry, last message was sent with wrong subject, please delete it :(
---
Hi,
is there a wonder-IC that will take 3.3V in input and give 5.0V in

output well

Post by Electron
filtered (similar to a linear voltage regulator output), and that

doesn't require

Post by Electron
many components?
I was thinking about an integrated boost converter + LDO but the

requirement of

Post by Electron
an inductor plus n resistor and capacitors doesn't make me really

enthusiast.

Post by Electron
Maybe a more integrated IC?
Or a charge-pump based one?
Current requirement is low, 50mA would suffice.
Do you know / can you suggest a nice and not too expensive IC which

requires as

Post by Electron
few external components as possible? I've searched but I am more lost

than before.

Post by Electron
Thank you very much.
With kind regards,
Mario

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--
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Tel: [phone] | Address: 3577 Countryside Road, Helena, MT 59602
***@imach.com | http://www.packetflux.com
<http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux>
<http://twitter.com/@packetflux>

[IVP]

Post by Forrest Christian (List Account)
My favorite chip in this regard is the MCP1661 (or MCP1662)

There are a lot of low voltage switchers around now. The last one
I used was the L6920 for LEDs and I've tried the Microchip ones
too. They're all good

http://www.st.com/en/power-management/l6920.html

Joe

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[RussellMc]

MCP1661 http://ww1.microchip.com/downloads/en/DeviceDoc/20005315B.pdf
MCP1662 http://ww1.microchip.com/downloads/en/DeviceDoc/20005316E.pdf
MCP16251 http://ww1.microchip.com/downloads/en/DeviceDoc/20005173B.pdf

TPS6122x http://www.ti.com/lit/ds/symlink/tps61220.pdf
MCP1252/3 http://ww1.microchip.com/downloads/en/DeviceDoc/20001752C.pdf

On 19 October 2017 at 12:57, Forrest Christian (List Account) <

Post by Forrest Christian (List Account)
My favorite chip in this regard is the MCP1661 (or MCP1662). It can be
used in boost, or buck/boost configurations.
​...