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TPS65911: TPS659113 PMIC sequencing

Mandar Mahajan89
Intellectual 345 points
Part Number: TPS65911

hello ,

one of my customer is  planning to use TPS659113 in new design.

requirement is as follows;

VDDCtrl         1.35V

VDD1              1.35V

VDD2              1.35V

VIO                 1.8V

LDO                 3.3V,1.8V

 

some preliminary doubts/queries such as;

How to set default  ON voltage to 1.35V

Can  we  connect external FET ( VDDCtrl) to 5V instead of 12V

How to set sequencing .

Appreciate a reply for the query . 

Thanks and Regards

Mandar 

  • 0
    TI__Mastermind 30280 points
    Mandar,

    The expert on the TPS65911 device has been assigned to this thread.

    Each variant of the TPS65911x device has specific default register settings that determine the output voltages of the DCDCs and LDOs as well as the sequencing.

    The block diagram of the VDDCTRL DC-DC controller shows that V5IN is connected to 5V. Where do you see 12V as a requirement?
  • 0 in reply to Brian Berner
    TI__Genius 16410 points
    Hello Mandar,

    The default sequencing and voltages are programmed in to the internal EEPROM, and cannot be changed. It looks like the closest device to your requirements is the TPS6591133, which has 1.2V for Vctrl, VDD1, and VDD2. One option is to use this device, and set the output voltages to 1.35V using I2C after the PMIC starts up.

    A second option is to use the device's "Test Boot" option with BOOT1 floating, which has no sequencing by default. Then you can set the output voltage for each rail, and enable them in sequence using a series of I2C writes, as described in this E2E post:
    e2e.ti.com/.../579493

    Regarding the external FET supply, yes you can use 5V. The specification states 3V to 25V range for the input voltage of external FETs. This is the first spec item in section 5.18 of the datasheet.

    Regards,
    Karl