Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

3.3 V from 1.8 V supply

Status
Not open for further replies.

jstor

Newbie level 2
Joined
Apr 27, 2018
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Location
Mountain View
Activity points
24
Say you have to power up a 3.3 V ADC from 1.8 V supply. Is DC-DC converter a good option or dual supply system is a way to go?
 

Hi,

Why dual supply? I don´t understand.

1.8V --> step up (boost) --> 3.3V
This can be with inductor or with capacitor charge pump.

Both are switching regulators. Take care not to produce too much noise, it may harm the ADC results.
(Proper GND plane, proper PCB layout, maybe additional filters, maybe linear post regualtor. You may look for "low noise" solutions.)

Klaus
 

If you have access to whatever the 1.8V is made from,
that's your best resource. Much easier and cleaner to
go down, than up. Not easy at all to find DC-DCs that
run off 1.8V (I saw none in recent looking, nothing that
would run below 2.7V as I recall).

You could make a C-pump in appropriate technology
but I would be a bit surprised to see one as an available
catalog part. If you find one, let us know.

A cheesy inductor boost converter and post-regulator
might be easier to lash up from loose parts, 1.8V will
drive a NPN base just fine and the NPN can stand the
overshoot. Then a decent filter and a 3.3V fixed LDO.
 

Hi,

If you use the analog.com selection guide for boost converters with internal switch you currently find 25 ICs that can do what you want.
Other manufacturers can do the same.
So 1.8V input voltage is not very special.

Klaus
 

The 'joule thief' is feasible when you're working with low voltage and low power.

joule thief 1_8V to 3_3V 10mA.png

The zener diode is optional in case output were to rise higher than 3.3 V.

- - - Updated - - -

By adjusting the potentiometer you can raise or lower output V.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top