+/- 9V reference/LDO sugestions

Carlos Silva85

Other Parts Discussed in Thread: TPS7A39

I'm looking for a dual programmable reference capable of generating a ±9V rail from ±15V. At least 25mA per rail. Accuracy at least 1%.

A linear regulator is preferred. Any options we can recommend?

over 7 years ago

0 Wilson Fwu over 7 years ago

TI__Expert 4320 points

Hi Carlos,

Thank you for sending in your request.

The only linear regulator we currently have in our portfolio that supports +/- rails is the TPS7A39.

Best Regards,

Wilson

0 Carlos Silva85 over 7 years ago in reply to Wilson Fwu

TI__Expert 4915 points

But do we have any series reference voltage capable of 9V output? We could use two (one each for +VE and -VE)

0 JCHK over 7 years ago in reply to Carlos Silva85

TI__Guru 50190 points

HI Carlos,

We do not have any fixed output +/-9V LDO. The TPS7A39 can be adjusted to support +/-9V with external resistors. Would this work for you?

Can you share what is requiring +/-9V?

0 Carlos Silva85 over 7 years ago in reply to JCHK

TI__Expert 4915 points

Thank you for your suggestion, but I'm afraid not. We will require 1% tolerance or better.

I have inquired regarding the usage of a shunt reference instead. Will see what the customer feedback is.

I'm surprised we don't offer a programmable series reference!?

0 JCHK over 7 years ago in reply to Carlos Silva85

TI__Guru 50190 points

HI Carlos,

Unfortunately we did not design for this to be a reference. Although LDO's can be used as references, they are not as precise as a real reference. But I think you may have already seen, we do not have -9V references either.

Would it be possible to get closer to solving your issue if you used 0.1% resistors?

Regards,

Power management

Power management forum

+/- 9V reference/LDO sugestions