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Have a look at the TRACO (http://www.tracopower.com) TYL and TVL units, 
less than 5mV p-p noise ripple. This can be improved with additional 
filtering.

Nino.

Vasile Surducan wrote:

>Hi all,
>
>I'm searching for a low noise switching supply IC. The goal is to get
>+5V/200mA and -5V/200mA from a +3.3V with less than 5mV ripple. Ideal
>one IC.
>Found so far: LT1534, MAX710, MAX735.
>
>Any good ideea appreciated.
>
>thank you,
>Vasile
>
>  
>

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