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TPS650864: TPS65086401RSKT Power Sequencing requirement

miriyala harichandana
Prodigy 60 points
Part Number: TPS650864
Other Parts Discussed in Thread: TPS650861, TPS650250

Hi We are using TPS65086401RSKT IC in our design,Please Confirm below Power Sequence is Possible.

This PMIC will be shared for SOC and FPGA.

First FPGA Will Power ON then SOC will Power ON

FPGA Power ON Sequence:

Sequennce Output Input Input Type
BUCK-6 Controller Should get Enabled 0.9V 12V Direct 12V
BUCK-5 Converter Should get Enabled 0.9V 3.3 Externa Buck
BUCK-2 Controller will get enabled 1.8V 12V Direct 12V
SWA1 Should get Enabled 1.8V 1.8 BUCK2 o/p
SWA1 O/P will be connected to External LDO 1.2V 1.8 Externa LDO
BUCK-4 Should get Enabled 3.3V 3.3V Externa Buck

SOC Power sequence requirement:

3.3V External Buck 3.3V 12V Direct 12V
1.8V LDO  1.8V 3.3V Externa Buck
BUCK-3 Converter Should get Enabled 1.2V 3.3V Externa Buck
BUCK-1 Controller Should get Enabled 0.8 12V Direct 12V
0.6V LDO 0.6 1.2 BUCK3 o/p

Please let us know How to achieve above Power sequence.

 

Regards,

harichandana.

  • 0
    TI__Genius 12735 points

    Hi Harichandana,

    This sequence is possible however you there a few things you listed that are not possible. For Buck-4 you listed the input and output as 3.3V, this is not possible. The line right above that with SWA1 O/P you listed the External LDO as the input, is that the input or the output? The load switch is not able to provide any voltage regulation so the input will be the same as the output.

    Be sure you have the VSYS powered on first and that the gate drivers for the controllers (DRV5V_2_A1 and DRV5V_1_6) are supplied by LDO5P0 or a similar 5V source before any of the controllers are sequenced. 

    When you are ready to create your sequencing, please see the TPS65086100 OTP Generator file. This file allows you to set the sequencing, output voltage, and other settings before programming to the device. I would recommend using this file as a baseline, it is a completed version of the OTP generator based on the TPS6508640 device.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    Prodigy 60 points

    Hi Layne,

    Thanks for the Gven info.

    When i am trying to change the device ID its not accepting.

    1. 12V supply will be given First to PMIC

    2. we are Not using any external 5V Supplies

    3. LDO5P0 will be connected DRV5V_2_A1 and DRV5V_1_6

    4. LDO5P0 used to generate the 3.3V from BUCK4

    Please share any document available to fill the XL sheet shared for power sequence.

    Regards,

    Harichandana.

  • 0 in reply to miriyala harichandana
    TI__Genius 12735 points

    Hi Harichandana,

    You will not be able to supply Buck 4 with LDO5P0, LDO5P0 has a maximum output current of 180 mA. You will need to use a different source for Buck 4. Here is the TPS65086100 Non-Volatile Memory Programming Guide to assist with the programming process and here is the TPS65086x Design Guide for help creating your design. There are more documents available in the technical documents section of the TPS650861 web page (located here). Feel free to go through them.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    Prodigy 60 points

    Hi Layne,

    Thanks for the info given.

    we have decided to used separate PMIC for SOC and FPGA.

    For SOC we need a PMIC which supports 32-kHz RC Oscillator.

    Following are the Power requirements.

    SI. No Supply Rail Voltage (V) Power Up Sequence Supply Current (A)
    1 VDDIO 3.3V 1 0.5
    2 PLL 1.8V 2 0.2
    3 DDR_VDDQ 1.2V 3 0.6
    4 DDR_LPVDDQ 1.2V 4 0.6
    5 DDR_Vref 0.6V 5 0.1
    6 VDD 0.8V 6 7

    Please suggest a PMIC which meets above requirements.

    I can only find TPS65912 IC with 32 32-kHz RC Oscillator, but its not meeting the Power requirement for SOC.

    Regards,

    Harichandana.

  • 0 in reply to miriyala harichandana
    TI__Genius 12735 points

    Hi Harichandana,

    The closest PMIC I can think of that can meet those requirements is TPS650250, but even that is not an exact fit. Let me know if you are interested in TPS650250 and I can send this thread to the expert for that device.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    Prodigy 60 points

    Hi Layne,

    The given part will not meet the current requirement and it doesn't have RC oscillator input.

    Regards,

    Harichandana. 

  • 0 in reply to miriyala harichandana
    TI__Genius 12735 points

    Hi Harichandana,

    If TPS650250 will not work for your use case I unfortunately do not have any other suggestions for PMICs that are user programmable that will work.

    Best regards,

    Layne J