TPS63000: [Design Review] Low noise power supply for EEG device

Alone173

Expert 1315 points

Part Number: TPS63000
Other Parts Discussed in Thread: TPS631000, TPS631010, TPS631011, TPS7A20

Tool/software:

Hello everyone,

Im working on the circuit of power supply for EEG device need lowest noise on rail.

The main power will start from battery( lithium 3.7V) or USB_C connector for charging, have a topology as below:

USBC - Battery charger----- Battery lithium

------ Buck boost converter to 5V ---> LDO to 2.5V

---> LDO to 3.3V

---> charge pump to -5V --> LDO to -2.5V

*Buck boost to 5V

* Charger:

*LDO to 2.5V

*LDO to -2.5V

*LDO to 3.3V

My purpose is choose low noise and low drop LDO for using in battery application.

So, please help to review and give the recommendation.

Thank you

7 months ago

0 Tao Zhang 7 months ago

TI__Mastermind 32350 points

Hi Alone,

Since the main question is about LDO selection, recommend to change the topic of thread to LDO but not TPS63000.

Or, system will assign this thread to BUBO team but not LDO.

For BUBO, recommend TPS631000/TPS631010/TPS631011 for your application but not TPS63000.

Regards

Tao

0 Alone173 7 months ago in reply to Tao Zhang

Expert 1315 points

Hi Tao
Could you please help to move my post to LDO post?
For TPS63xxx, Could you help to review and advice for low noise option? ( filter, alternative parts )
Thank you.

0 Tao Zhang 7 months ago in reply to Alone173

TI__Mastermind 32350 points

Hi Alone,

Ok, will assign this thread to LDO team, it is better if you can change your topic meanwhile.

About low noise, i think what we should care about the BUBO part should be some high frequency noise because you have LDOs followed. So, about filter,

my suggestion is bead+cap but not a common choke.

For alternative part of BUBO converter, recommend TPS631010/1 because it is better performance and small size.

Regards

Tao

0 Hannah Grace 6 months ago

TI__Genius 15125 points

Hello,

Thank you for your question.

Overall, the implementation with the LDO looks good according to datasheet specification.

If you would like to see our low noise LDO portfolio: Linear & low-dropout (LDO) regulators product selection | TI.com

Though, the TPS7A20 device is already an ultra-low noise and low dropout product and should be fine for this application.

Hope this helps!

Best Regards,

Hannah

0 Alone173 6 months ago in reply to Tao Zhang

Expert 1315 points

Hello Tao
Could you please recommend altenative part for TPS631010/1 ?
Because it use BGA package, make the cost for PCBA increase.
Thanks.

0 Tao Zhang 6 months ago in reply to Alone173

TI__Mastermind 32350 points

Hi Alone,

TPS631000 with SOT package is ok for you? same die with TPS631010 but different package.

Regards

Tao

0 Alone173 6 months ago in reply to Tao Zhang

Expert 1315 points

Hello Tao
Thanks for your feedback.
Its OK to use with TSP631000 ( not support discharge ?)
One more question, with the input and ouput of buck/boost can same voltage (input 5V from USB, battery disconnect from the power supply, while the output setting for 5V) for the TPS631000?
If not, can I add a diode after USB port to reduce a voltage under 5V?
Thank you.

0 Tao Zhang 6 months ago in reply to Alone173

TI__Mastermind 32350 points

Hi Alone,

No diode is needed, TPS631000 can regulate output voltage well even when Vin is equal with Vout.

Regards

Tao

0 Alone173 6 months ago in reply to Tao Zhang

Expert 1315 points

Hi Tao
Could you please accept my private msg ?
I will send you a final schematic to help to make the review.
Thank you.

0 Tao Zhang 6 months ago in reply to Alone173

TI__Mastermind 32350 points

Hi Alone,

Yes, i got your message and i will close this thread if you do not mind.

Regards

Tao

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TPS63000: [Design Review] Low noise power supply for EEG device