Push-Pull driver <<1ohm Rdson?

Hello Folks,

Looking for a staunch chip to drive transformers in the 30-150kHz range. 
The most powerful (and available) one I found is the MIC4451 but it's 
1ohm Rdson. Way too much.

There are bigger ones but they usually have a charge pump and the 
efficiency is pretty poor when operated at less than 3A:
http://rocky.digikey.com/weblib/Infineon/Web%20Data/TDA21201prelimDS.pdf

What I need is n/p channel push-pull output (not two n-channels), no 
charge pump because the clock sometimes stops, and ideally 100-200mohm 
Rdson. External FETs aren't so hot, too much cross conduction. I was 
hoping there'd be n/p synchronous buck converters. But nope, all with 
charge pumps.

Any ideas?

-- 
Regards, Joerg

http://www.analogconsultants.com/

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