LM27761: -1.2V output requirement on LM27761

Gary Teng

Part Number: LM27761
Other Parts Discussed in Thread: TPS63710

Hi Sir,

My customer want to find a low noise solution for their sensor application. (5V to -1.2V with LDO). Do you think we can use LM27761 for that? Or other suggestion? Thanks for your kindly help.

Best regards,

Gary Teng

10 months ago

+1 Febin 10 months ago

TI__Mastermind 20440 points

Hi Gary,

Unfortunately we do not have a Charge pump that could generate a -1.2Vout.

You may have to consider Inverting Bucks like TPS63710.

It would be interesting to know further about the sensor application.

-What exactly is the EE?

-Is it a typical requirement?

-What is the load for the -1.2V rail?

-What is the max load current required?

Regards,

Febin

0 Gary Teng 10 months ago in reply to Febin

Genius 5310 points

Hi Febin,

Customer need a ldo to prevent noise from their image application. We'll find other solution to build up buck / inbertor + LDO solution. Thanks.

Regards,

Gary

0 Febin 10 months ago in reply to Gary Teng

TI__Mastermind 20440 points

Hi Gary,

Just another thought, you could configure any buck in an inverted topology.

Please refer the App notes below or Blog.

Reference Design

Using the TPS62125 in an Inverting Buck-Boost Topology

Create an Inverting Power Supply From a Step-Down Regulator

Using a buck converter in an inverting buck-boost topology

Regards,

Febin

0 Febin 9 months ago in reply to Febin

TI__Mastermind 20440 points

Hi Gary,

Do you need any further support? If not, I will go ahead and close this thread.

Regards,

Febin

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LM27761: -1.2V output requirement on LM27761