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buck stepdown chips

Hi,

I am looking for some high frequency (1MHz+) step down buck switcher chips that can handle an input voltage of at least 7.4V and at least

500mA output current. The Texas Instruments TPS623xx 500mA/3MHz switchers are perfect but they are only rated at 6Volts input max! I am sure they could take 7.4V but I would rather not risk this :) I need to generate 5V, 3.3V and several other lower voltages from the 7.4V (two lithium batteries in series). This is a portable application, so power is an issue or I would just use a linear regulator to generate 6V from the 7.4V input.

cheers, Jamie Morken

Reply to
Jamie Morken
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So you're space constrained? Lower switch freq=higher efficiency...

Lots of them around! Check National, Maxim, Semtec etc...

/A

Reply to
Anders F

Did you look at the TPS62050? It accepts up to 10V input and is pretty efficient. It runs at 850kHz usually, which is a bit under your

1MHz. Although it would seem you can synchronize it to an external signal up to 1.2MHz so it might still be OK. I have used them without problems (although the packaging is quite small and they can be difficult to get sometimes). 
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John Devereux
Reply to
John Devereux

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