dual output dc/dc converters with +-12V output

[Mike Noone]

Hi - I need a DC/DC converter/controller that gives about a +-12V
regulated output. It can be less than that or greater than that, but it
needs to be very clean. Load current should peak at under 1ma on both
lines. I have 3.3V and 5V supplies available. I feel like this should
be a very basic, simple, common component but I can't find any parts
that meet these specs. I'm thinking I'm just searching for the wrong
thing. I found the MAX680 which mostly looks OK, but it's not
regulated.

Any suggestions? I can't believe I'm having difficulty finding such a
part.

thanks!

-Mike

 

[martin griffith]

Hi - I need a DC/DC converter/controller that gives about a +-12V
regulated output. It can be less than that or greater than that, but it
needs to be very clean. Load current should peak at under 1ma on both
lines. I have 3.3V and 5V supplies available. I feel like this should
be a very basic, simple, common component but I can't find any parts
that meet these specs. I'm thinking I'm just searching for the wrong
thing. I found the MAX680 which mostly looks OK, but it's not
regulated.

Any suggestions? I can't believe I'm having difficulty finding such a
part.

thanks!

-Mike

Have a look at LT1533 from linear, and AN70 from Linear


martin

 

[Mike Noone]

Have a look at LT1533 from linear, and AN70 from Linear

martin

Hi Martin - I'm really hoping for something more integrated than that.
I looked further into it and peak current should be maxing out at about
250 micro amps. I think AN70 is more about designing higher current
solutions.

Thanks,

-Mike

 

[martin griffith]

Hi Martin - I'm really hoping for something more integrated than that.
I looked further into it and peak current should be maxing out at about
250 micro amps. I think AN70 is more about designing higher current
solutions.

Thanks,

-Mike

OK, maybe a cockroft walton missmash driven fron a nand gate
osculator, since you only need a ma or so


martin

 

[James Waldby]

Hi Martin - I'm really hoping for something more integrated than that.
I looked further into it and peak current should be maxing out at about
250 micro amps. I think AN70 is more about designing higher current
solutions.

Page 8 of the LT1615 data sheet shows a dual supply, 4 ma +- 20V
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1031,C1061,P2245,D1687 [url all on one line] Also see LT3464.

Probably not as quiet as you want - unlike the LT1533, which is
advertised as "ultra quiet", the LT1615, LT1615-1, and LT3464 are
just low-power boost converters. You'd need to add some filtering
and/or regulation.

-jiw

 

[Mike Noone]

Page 8 of the LT1615 data sheet shows a dual supply, 4 ma +- 20V
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1031,C1061,P2245,D1687 [url all on one line] Also see LT3464.

Probably not as quiet as you want - unlike the LT1533, which is
advertised as "ultra quiet", the LT1615, LT1615-1, and LT3464 are
just low-power boost converters. You'd need to add some filtering
and/or regulation.

-jiw

At +-20V that would give me plenty of room for linear regulation - and
4ma gives me plenty of breathing room. External parts count is fairly
low, so I'd say that this seems like a good solution.

Thanks!

-Mike

 

[Mike Noone]

OK, maybe a cockroft walton missmash driven fron a nand gate
osculator, since you only need a ma or so


martin

I'm pretty sure you're just making that name up, since Google's never
even heard of it

-Mike

 

[Roger Hamlett]

I'm pretty sure you're just making that name up, since Google's never
even heard of it

Just use 'Cockroft Walton'. The 'missmash', was probably a mispelling of
'mishmash'. These are used in just about every common high voltage supply
around. Very commonly used from NE555's, rather than nand gates (more
drive), to generate low power supplies.

Best Wishes

 

[samiam]

You could use the hin232 or max232 ttl-to-rs232 level converters. They
put out +-10v. But it depends on whether your application requires the
extra 2 volts.

I had a dac/op amp application that I simply redesigned to run off
the outputs of the level converters and I was able to drive the entire
system with +5v