Hello,

    I'm using the Linear Technologies LT1173 and LT1176 switching voltage
regulators with great sucess, but it's expensive. So, I'm looking for an
alternative.

    What seens to be a very good solution is the NationalSemi's LM78S40
(http://www.national.com/pf/LM/LM78S40.html). It's on the market for a long
time and costs (according to National's page) US$0.80 in 1K quantities. So
it's too much cheaper than LT1173 and LT1176.

    Also, I'm re-reading the PicList thread about low power step-down
switching, but I can't make the circuits proposed to work according either
simulated or in real-word.

    Any sugestions? Is someone here using the 78S40?

    Thanks,

    Brusque

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Edson Brusque                 C.I.Tronics Lighting Designers Ltda
Researcher and Developer               Blumenau  -  SC  -  Brazil
Say NO to HTML mail                          www.citronics.com.br
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