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Suggestion:Which Currentmode PWM controller, Vin 3-6V?

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Yansi:
Hello!

I have just sifted through 38 pages on Mouser, trying to find a current-mode pwm controller, capable of running from 3 to 6V, unfortunately unsuccessfully.

What I am aiming for is a battery powered (4xAA alkaline) boost converter, just couple of W, but rather higher voltage, than usually available chips --> hence external mosfet required.

The closest I came around was MCP1632, unfortunately, 6V absolute maximum is I think not safe for use with 4 AA cells.  (something like UC3843, however for <4V operational voltage would be sooo nice!). Am I asking for just too much?   ???

Thank you for any suggestions! Cheaper the better!

Buriedcode:
What output voltage?  If it is only slightly higher than the max output voltage, coupled inductors 1:1 are widely available in a range of inductance and will half the peak switch voltage.

Yansi:
Coupled inductors forbidden. Too pricey & I am too lazy to wind any such. And I am trying to avoid designing this around the old steaming pile 34063...

It is just a one-off project for a friend, output voltage needs to be 80V and reasonably clean (quite sensitive stuff will be supplied with it). Hence why I wanted a PWM controller, not hysteretic controller like 34063, which are little factories for big interference.

mariush:
Maybe check

LT8361 ... barely... 5v or higher preferred.



LT3482 ... up to 90v output voltage, with low input voltage.

Both chips around 3.5$ if you buy 10-25... something like that.

Yansi:
Waaaaaay to pricey for what it is. I can't get those under $10 a pop. I could make a whole bunch of different solutions for that price, including the coupled inductor one.

I have not considered using IC with integrated switch, due to exactly this pricing. :-/ So just looking for a controller IC, or one that an external mosfet may be connected to.

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