TPS65086100RSKT

Hi Moshe,

Moshe Haviv said:

The data sheet not support the efficiency in case of PVIN3,4,5 connected to 3.3V only 5.0V.

Can you tell me where in the datasheet you are referencing here?

Moshe Haviv said:

For programming OTP memory, IRQB and CTL4 pins should be connected to 7.0V.I need to use 7.0V power supply. What is the maximum current from this 7.0V power supply when programing the OTP memory?

I do not have a number for max current for this. But since it is a logic input it should not be very large

Moshe Haviv said:

Is their any option not to use any of CTL1-CTL6 and the PMIC will start enable the power supply immediately? I don’t want to use another/external power supply to enable CTL1-CTL6.

No the power supplies must be controlled by these. However, LDO3P3 or LDO5P0 can be used to control these in order to not require an external power source.

Moshe Haviv said:

BUCK1,2,6 – DC output voltage accuracy. According to the data sheet the accuracy I +/- 2% for Vout=1.0-3.3V @ 100mA to 7A. In case I want to use Vout=0.82A @ 10A.What is the DC output voltage accuracy in my case?

We do not have an exact number for this but I would expect similar to this spec

Moshe Haviv said:

The TPS65086x Evaluation Module board includes diode (D7 refence designator) to CTL4 pin. Could you explain why do we need this diode?

This Diode is to prevent back current into other parts of the system when CTL4 is connected to 7V

Moshe Haviv said:

Only Buck 2 and not Buck1,6 includes FBGND2 (negative feedback) pin. So I guess that Buck2 should be the strong buck in the PMIC. Right?

FBGND is meant to be a feedback from the ground of the processor for optimal voltage regulation

Moshe Haviv said:

The OTP memory is loaded into the corresponding volatile registers which are then used to control the PMIC. After that all the power supplies enable using the OTP, Can we use the I2C interface to fine tuning the output voltages of the PMIC by write to registers?

Yes, you can use I2C to adjust the registers whenever the device is on, even if the specific resource is not on yet. For more info on this, please refer to the register map in the datasheet.

Thanks,

Daniel W

Thanks Daniel!

See below my answers  [MH]:

1. The data sheet not support the efficiency in case of PVIN3,4,5 connected to 3.3V only 5.0V.

Hello Daniel,

Did you see my previous questions/comments?

Thanks,

Moshe 

Hi Moshe,

I am looking into these questions and will update you with more information tomorrow

Thanks,

Daniel W

Hi Moshe,

We do not provide exact performance for every situation of this device but please reference the datasheet for close scenarios to see similar performance.

1. We provide efficiency for typical use case. in your case you can expect similar performance but we do not provide exact numbers.

2. For the 7V programming power supply, 10mA should be good for a max current.

3. We do not provide an exact number for this case but you can expect to see similar accuracy to the spec you see in the datasheet.

Thanks,

Daniel W

Thanks Daniel for your support!

1. Regarding PVIN3,4,5 connected to 3.3V and not to 5.0V

My motivation is to increase the PMIC efficiency and to connect PVIN3,4,5 to 3.3V.

Do you know is TI or one of TI’s customers implement it?

Can you recommend to do it?

2. I need to know if i need to add 7.0V power supply to program the PMIC so I have the following question:

In case that we want that TI or Third party distributors will program this PMIC according to our case. What is the minimum quantity that we need to purchase?

Thanks,

Moshe

Hi Moshe,

1) PVIN3/4/5 can be run on 3.3V

2) TI does not provide programming for this part. However, there is a third party option. Arrow provides programming through Dediprog.

Thanks,

Daniel W

Hi Daniel,

I want to use the TPS65086100RSKT PMIC and to program the OTP memory on my board.

What are the LDOs that enable before the program process?

I think the answer is LDO5 and LDO3P3 but I’m not sure.

Thanks,

Moshe

Hi Moshe,

You are correct. LDO3P3 and LDO5P0 are always on when the chip is powered.

Thanks,

Daniel W

Hello Daniel,

A few questions:

• Is the TPS65086100RSKT recommended for new designs, or do you have any replacement for this device?
• Can get engineering samples for the TPS65086100RSKT PMIC?
• Do you know if TI has shortage with this device?

Thanks,

Moshe

Hi Moshe,

Thank you for your question. Please expect a response later today.

Thanks,

Daniel W

Hi Moshe,

TPS65086100 is still recommended for new designs.

Please reach out to your local TI sales rep for information on samples and lead times.

Thanks,

Daniel W

Thanks Daniel,

 A few questions:

• We do you know if TI has any replacement for TPS65086100RSKT PMIC?
• After programing the PMIC the LDOA1 can be always-on when the chip is powered. Right?
• What is the efficiency of LDOA1 and LDO5?
• I want to use LDO5 (180mA Max) as an input for BUCK1,2,6 and LDOA1 (DRV5V_1_6, DRV5V_2_A1 inputs).

In that case what is the maximum current from LDOA1?

What is the maximum current from DRV5V_1_6 input?

What is the maximum current from DRV5V_2_A1 input?

Regards,

Moshe

Hi Moshe,

TI does not have any direct replacements to the TPS65086100RSKT but does offer the same device pre-programmed for certain cases. For these, please see the TPS650864.

LDOA1 can be programmed as always on.

Efficiency data for LDO5 and LDOA1 is not provided.

LDO5 can be used to power DRV5V_1_6 and DRV5V_2_A1, but in this case current of LDOA1 is limited by LDO5 output and not itself. for an example of this, please see the TPS6508640 power map in the TPS650864 datasheet.

Thanks,

Daniel W

Thanks Daniel!

Regarding your answer “TI does not have any direct replacements to the TPS65086100RSKT but does offer the same device pre-programmed for certain cases. For these, please see the TPS650864”

I didn’t under your answer.

I didn’t see any TPS650864 device in the market, only the following parts (Table 5-1 in TPS650864cdata sheet):

Can I buy the pre-programmed TPS650864 device? Where?

Can I buy the programed devices from the above table and reprogram these devices again? We have two OTP memories.

Regarding LDOA1 max current when using LDO5 for inputs DRV5V_1_6 and DRV5V_2_A1.

Your answer”LDO5 can be used to power DRV5V_1_6 and DRV5V_2_A1, but in this case current of LDOA1 is limited by LDO5 output and not itself. for an example of this, please see the TPS6508640 power map in the TPS650864 datasheet.”

Sorry ,but I didn’t find the answer in TPS650864 data sheet.

Thanks,

Moshe

Hi Moshe,

Sorry for the confusion, when I mentioned TPS650864, I meant the TPS650864xx devices in the table you included, including TPS6508641, TPS6508640, TPS65086401 and TPS65086470.

It is possible to reprogram TPS650864xx devices using the second bank of OTP memory.

I will update later today with more information regarding the max current specs.

Thanks,

Daniel W

Hi Moshe,

The gate drivers have been seen to consume approximately 200μA of quiescent current per controller at 5V in one use case. Based on this a significant amount of current is still available for LDOA1.

Thanks,

Daniel W

Hello Daniel,

How can I calculate the power consumption (heat) on the PMIC according to my use case?

Is there any tool that I can calculate this number?

Thanks,

Moshe

Hi Moshe,

There is a Flotherm model available in the product folder for these devices for thermal simulations.

https://www.ti.com/lit/zip/swcm008

Please send an E2E friend request and I can provide a power estimation tool over direct message.

Thanks,

Daniel W

Hi Daniel,

Sorry, I clicked the “Connect” button, but I didn’t see “Request friendship”

Regards,

Moshe

Hello Daniel,

I want to use BUCK6 for 1.2V@26A peak current.

I will use the CSD87350Q5D external FET that supports this high current.

• What is the recommended inductor for this case?
• What is the efficiency for this case? The efficiency graphs in the data sheet support up to 7A

 Thanks,

Moshe

Hi Moshe,

I have sent you a message after accepting your friend request.

What is the input voltage for Buck6 in your use case?

Thanks,

Daniel W

Hi Daniel,

The input voltage for Buck6 is 6V-13.2V (Nominal 12V).

Regards,

Moshe

Hi Moshe,

Thank you for the info. I will update you tomorrow on this.

Thanks,

Daniel W

Thanks Daniel!

I want to use BUCK6 for 1.2V@26A peak current.

I will use the CSD87350Q5D external FET that supports this high current.

• What is the recommended inductor for this case? (I have asked you before).

I want to use BUCK2 for 0.82V@19A peak current. The input voltage is 6V-13.2V (Nominal 12V).

I will use the CSD87588N external FET that supports this high current.

• What is the efficiency for this case? 

• What is the recommended inductor for this case?

I want to use BUCK1 for 2.5V@11A peak current. The input voltage is 6V-13.2V (Nominal 12V).

I will use the CSD87381P external FET that supports this high current.

• What is the efficiency for this case? 

• What is the recommended inductor for this case?

I want to use BUCK1 for 1.1V@14A peak current. The input voltage is 6V-13.2V (Nominal 12V).

I will use the CSD87381P external FET that supports this high current.

• What is the efficiency for this case? 

• What is the recommended inductor for this case?

Many thanks,

Moshe