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Part selection for PMIC

Delun Kao
Intellectual 295 points
Other Parts Discussed in Thread: LP8733, TPS650861

HI TI,

We are working on a project, please confirm the following requirements, can you suggest us suitable parts? Thanks.

The requirements are as follows:
a. Monitor output voltage, current and temperature.
b. Output voltage adjustment accuracy <= 0.01V.
c. Sequence can be controlled.
d. Preferably, PMIC can directly provide 6 rails.
 
Power consumption:
1. 12V to 0.75V @ 20A
2. 12V to 1.8V @ 1A
3. 12V to 1.2V @ 1A
4. 12V to 0.75V @ 1A
5. 12V to 0.6V @ 1A
6. 12V to 1.1V @ 3A
Regards,
Delun
  • 0
    TI__Genius 10000 points

    Hi,

    We do not have a PMIC that can directly supply this many rails from 12V. Usually, we recommend that there is a pre-regulator to 3.3V or 5V that converts the 12V input. This will also help efficiency and thermal performance.

    For the 20A rail, you may need consider a controller device that allows for 20A loading.

    With sequencing requirements, there are two options:

    1. Configurable devices that can be controlled by I2C to meet sequencing requirements: LP8756, LP8752, LP8733

      With this implementation, a LP8752 + 1 discrete buck may fit.

    2. For large volume projects, custom OTP settings can be generated for some of our other PMIC devices. For this option, you would need to follow up with your local TI representative to understand the options, based on volume and timelines.

    Thanks,

    Nastasha

  • 0 in reply to Nastasha
    Intellectual 295 points

    HI Nastasha,

    If I use discrete buck(Do not use PMIC), do you have a recommended voltage and current monitoring IC for ITEM 2-6?

    What is the accuracy range for low voltage and low current?

    Thanks.

    Delun

  • 0 in reply to Delun Kao
    TI__Genius 12735 points

    Hi Delun,

    This part may not fit your exact monitoring needs but you could look into TPS650861, which is a user programmable PMIC that can support those output currents/voltages and is capable of supporting an input between 5.6V and 21V. This device will allow you to determine your own sequencing and output voltage levels.

    Best regards,

    Layne J