buck stepdown chips

Nov 24, 2004 2 Replies
J

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



Vote
Twitter Facebook LinkedIn
A

So you're space constrained? Lower switch freq=higher efficiency...

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

/A

Vote
Twitter Facebook LinkedIn
J

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).
John Devereux
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required