Boost Controllers for 3.3V to 12~24V conversion

Hello sirs.
I have a PCB where I have a precision 3.3V power supply with 1A capacity.
I will need another power supply with 12V or 15V or 20V or 24V capable of supplying around 80mA DC, generated from this 3V3 rail.

I will change the PCB layout when needed, and the only power source I have to generate the "boost" voltage is the 3.3V rail.

Somebody recomends controller ICs for this purpose?

I have many types and values of inductors here so I just need to get some samples of some controller ICs, to test them in practice.

This power supply can be not insulated (no need of a flyback insulated design).
I can buy the Boost controllers on Digikey.

The parameters are:

3.3V -> 12V (80mA or more, if possible)
3.3V -> 15V (80mA or more, if possible)
3.3V -> 20V (70mA or more, if possible)
3.3V -> 24V (60mA or more, if possible)

Maybe some controllers from National, Texas, ST, Fairchild, Power Integrations.
Recommendations?

This power supply will be used in supersonic applications.
Help?

Use very cheap MC34063A

here is calculator:

**broken link removed**

http://www.nomad.ee/micros/mc34063a/

I have a PCB where I have a precision 3.3V power supply with 1A capacity.
I will need another power supply with 12V or 15V or 20V or 24V capable of supplying around 80mA DC, generated from this 3V3 rail.

Click to expand...

3.3V -> 12V (80mA or more, if possible) >> 240mA min. from 3.3V
3.3V -> 15V (80mA or more, if possible) >> 400mA min.
3.3V -> 20V (70mA or more, if possible) >> 490mA min.
3.3V -> 24V (60mA or more, if possible) >> 480mA min.

Power taken from 3.3V supply is 1.6A min. + power dissipations

Not possible with power supply 3.3V / 1.0A

MC34063A have about 85% efficiency. He can cover all four channel with 100mA current each.

But this is simple circuit he can try and measure input current at some output current and see situation. Input current will vary from several parameters, but best is to measure and see real situation.

PCB can be very small in SMD.

I use this IC to make pico 500mA 12V from 5V, and I'm very happy with that.


Price for SMD packaged IC is about 0,2eur/piece