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TPS65023-Q1: PMIC Pin connection and power query

Kaushal K
Prodigy 80 points
Part Number: TPS65023-Q1
Other Parts Discussed in Thread: TPS65023

Hello,

We are planning to use TPS65023QRHARQ1 PMIC to power-up the system with nxp's IMX6ULL processor and our system.

Input supply VIN = 5V.

Schematic diagram is attached below.

Query 1: Can we connect the PMIC pin#27 RESPWRON to the processor POR pin for proper operation of the system?

Query 2: PMIC pin#14(VSYSIN) and 15(VBACKUP) are shorted to ground in our schematic. Will it provide 30mA output on VRTC output with this configuration or any other configuration is required?

Query 3: What would be the initial output voltages on each buck regulator output at time of power-up?

Query 4: For POR functionality, any other pins from PMIC can be used?

Query 5: Is PWRFAIL output is similar to PGOOD output?

 

Thank in advance!

  • 0
    TI__Mastermind 21135 points

    Hi Kaushal,

    The primary owner for this part is currently out of office. We'll work to get another update for you by the end of next week.

    Regards,

    James

  • 0 in reply to James Steenbock
    TI__Mastermind 21135 points

    Hi Kaushal,

    Kaushal K said:
    Query 1: Can we connect the PMIC pin#27 RESPWRON to the processor POR pin for proper operation of the system?

    The RESPWRON output can be used for processor reset functionality. The signal is active low for the PMIC.

    Kaushal K said:
    Query 2: PMIC pin#14(VSYSIN) and 15(VBACKUP) are shorted to ground in our schematic. Will it provide 30mA output on VRTC output with this configuration or any other configuration is required?

    You can leave the VSYSIN pin and VBACKUP pins shorted to ground. There is an internal priority structure that will connect VRTC to an internal 3V / 30mA LDO. The LDO will supply the proper output without any additional configuration as long as you have a valid VCC input voltage. Below is a picture of the internal system from the TPS65023-Q1 datasheet:

    Kaushal K said:
    Query 3: What would be the initial output voltages on each buck regulator output at time of power-up?

    The output voltages for each buck regulator will depend on the DEFDCDCx pin connections at the time of power-up. The regulators should ramp up to their set voltage as soon as the input power thresholds for the device have been reached.

    Kaushal K said:
    Query 4: For POR functionality, any other pins from PMIC can be used?

    RESPWREN is the recommended POR signal for most applications. The INT signal is used as a indicator for proper power rail voltage regulation but does not directly track the system voltages for VRTC. PWRFAIL and LOW_BAT are only related to an internal comparator with a 1V reference, but these signals do not cover some of the other potential reset conditions. 

    Note that these output signals are controlled by the main power path as mentioned in the datasheet (pictured below):

    Kaushal K said:
    Query 5: Is PWRFAIL output is similar to PGOOD output?

    PWRFAIL only considers a single input signal and compares it to an internal 1V reference. The INT signal is closer to an overall PGOOD functionality since it tracks the PGOOD comparators for each DCDC rail and LDO.

     

    Regards,

    James

  • 0 in reply to James Steenbock
    TI__Mastermind 21456 points

    Hi Kaushal,

    I'm adding below the link to a previous E2E post where I provided my inputs for the RESPWRON and PWRFAIL pins from the PMIC. Also, here is the link to the Apps note that describe the connections between the TPS65023 PMIC and the imx6: Power Supply Design for NXP i.MX 6 Using the TPS65023

    Link: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1107478/tps65023-pin-assignment-clarification

     

    Thanks,

    Brenda