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Drop-in replacement for TC1044?
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Boerge



Joined: Sep 02, 2009
Posts: 77
Location: Germany

PostPosted: Mon Apr 29, 2019 10:49 pm    Post subject: Drop-in replacement for TC1044? Reply with quote  Mark this post and the followings unread

Hello,

for my LDB-1se I need a DC-to-DC-Converter TC1044. Not easy to source here in Germany. I read somewhere that the LT 1054 could be used as an replacement. Is it a drop-in or have I to change the circuit?

greetings

Boerge

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Grumble



Joined: Nov 23, 2015
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PostPosted: Mon Apr 29, 2019 11:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

LMC7660 which has slightly less good parameters, but might be good enough for your purpose.
Just check the schematics.


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Boerge



Joined: Sep 02, 2009
Posts: 77
Location: Germany

PostPosted: Tue Apr 30, 2019 12:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for the hint - 7660 seems to fit the needs, and is available via reichelt.de (and much cheaper than the LT1054 Smile )
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AlanP



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PostPosted: Tue Apr 30, 2019 10:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

There are a few of those chips. MAX1044 is one that springs to mind.

The things to be careful of are maximum current, voltage, and also the switching frequency. (Some chips need two pins bridged to lift the frequency above audio range, other chips have the switching freq stuck in audio range... always check the datasheet.)
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Grumble



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PostPosted: Wed May 01, 2019 12:34 am    Post subject: Reply with quote  Mark this post and the followings unread

The MAX1044 has a BOOST pin that raises the oscillator frequency above
the audio band and reduces external capacitor size requirements.

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mph



Joined: Aug 25, 2007
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Location: France

PostPosted: Wed May 01, 2019 12:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Beware of overvoltage with the MAX1044 /ICL7660: +10V input and it's blown.
The LT1054 is far more reliable for "around" +9V operation.
Also the switching is at a higer frequency on the 7660s which makes it acceptable for audio applications.
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