TPS650861: Schematic Review

Anandraj Shanmugam

Prodigy 20 points

Part Number: TPS650861

Tool/software:

Hi Team,

Please find the attached schematic for your review.

TPS65086100_Schematic_Review_TI_1.pdf

We are using PMIC (TPS65086100) in our design.

Our design Requirement are mentioned as follows:

PMIC Regulator	VIN	VIN Min	VIN max	voltage	Maximum current (peak) [A]
BUCK2	Vsys	6.6	13.2	0.734V	19.62
BUCK5	3.3V Internal	3.135	3.465	0.734V	2.025
BUCK4	3.3V Internal	3.135	3.465	0.90V	2.06
BUCK6	Vsys	6.6	13.2	1.1V	17.48
VTT_LDO	BUCK6 output	1.1	1.8	0.6 (Not used)	NA
BUCK1	Vsys	6.6	13.2	2.5V	16.44
BUCK3	3.3V Internal	3.135	3.465	1.8V	2.4
LDOA1	LDO5 5V	4.75	5.25	1.8V	0.08
LDO5	Vsys	6.6	13.2	5V	0.05

Kindly provide the review comments based on above design requirement.

Thanks & Regards,

Anandraj S

over 1 year ago

0 James Steenbock over 1 year ago

TI__Mastermind 21765 points

Hi Anandraj,

Please fill out the schematic tab of the TPS65086x Schematic and Layout Checklist (Rev. A) by changing each line item from "Open" to "Used (or Not Used) & Complete". Once this checklist is filled out, you may share it here and I can give the schematic a second pass.

If your pin connection is different than the recommendation please note this in the comments with a brief explanation.

Regards,

James

0 Anandraj Shanmugam over 1 year ago in reply to James Steenbock

Prodigy 20 points

Hi James,

Thanks for your update.

Please find the attached "TPS650860 Schematic Checklist, Layout Checklist_Filled.xlsx" with filled based on our design.

TPS650860 Schematic Checklist, Layout Checklist_Filled.xlsx

Regards,

Anandraj S

0 James Steenbock over 1 year ago in reply to Anandraj Shanmugam

TI__Mastermind 21765 points

Hi Anandraj,

Thank you for sending that over. I should have my feedback ready for you by the end of the day tomorrow.

Regards,

James

0 James Steenbock over 1 year ago in reply to Anandraj Shanmugam

TI__Mastermind 21765 points

Hi Anandraj,

Here is my feedback on the schematic:

If you are using remote feedback, keep an eye on the output voltage ripple. A bypass capacitor close to the PMIC may help if you see any low frequency ripple in the output due to the feedback loop propagation time. I am mainly referencing this short TI article for this suggestion: https://www.ti.com/lit/pdf/slyt467
3.3V is acceptable as a pull up source for the CTLx pins, no issues there.

Regards,

James

0 Anandraj Shanmugam over 1 year ago in reply to James Steenbock

Prodigy 20 points

Hi James,

Thanks for your feedback.

Kindly provide your feedback on the external MOSFET, Inductor and output Capacitor in our design as per requirement mentioned above.

Thanks & Regards,

Anandraj S

0 James Steenbock over 1 year ago in reply to Anandraj Shanmugam

TI__Mastermind 21765 points

Hi Anandraj,

I didn't see any issues with inductor, capacitor, or MOSFET choice.

As long as you doubled checked your values using the datasheet equations in section 6.2.1.2.1 Controller Design Procedure, the design should be fine.

Your MOSFET choice is fine as well as far as the current capability.

Regards,

James

0 Anandraj Shanmugam over 1 year ago in reply to James Steenbock

Prodigy 20 points

Hi James,

Thanks for your feedback.

Regards,

Anandraj S

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TPS650861: Schematic Review