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Best PMIC for My design

Sajin M
Intellectual 360 points
Other Parts Discussed in Thread: TPS650231, LM26480, LM10524, BOOSTXL-TPS65218, TPS65218D0

Hi,

I am Looking for the best PMIC that will fit for my design. The requirements are given below:

  1. Input:
    1. 3.5V to 4.2V
    2. Typically 3.7V
  2. Output 1:
    1. Vout: 3.3V
    2. I out maximum: 0.4 A
    3. I out normal: 0.3 A
  3. Output 2:
    1. Vout: 1.5V
    2. I out maximum: 0.2 A
    3. I out normal: 0.15 A
  4. Output 3:
    1. Vout: 1.2V
    2. I out maximum: 0.5 A
    3. I out normal: 0.4 A

The PMIC should be as small as possible. Please help me to find the best PMIC for the above requirements.

  • 0
    TI__Mastermind 33380 points
    Hi, Sajin,

    Please check if the current unit you listed "mA" is a typo? Also, can you specify the 3.3V more detail? for example, can it be 3.3V(+/-3%) in its full load range?
    Thanks!
    Phil
  • 0 in reply to Phil Yi40
    TI__Mastermind 33380 points
    Hi, Sajin,

    Please take a look at the TPS650231 and let's know if you have any more questions.

    Thanks!
    Phil
  • 0 in reply to Phil Yi40
    Intellectual 360 points

    Hi Phil,

    The Current unit is milliampere (mA).

    The 3.3V can have a tolerance of +/-3% at its full load rage.

  • 0 in reply to Phil Yi40
    Intellectual 360 points

    Hi Phil,

    I have one more Output is needed that will be:

    Vout: 5.5V
    I out maximum: 0.1 A
    I out normal: 0.05 A

    So it will need one boost converter also.

  • 0 in reply to Phil Yi40
    Intellectual 360 points

    I think LM10524 is more suitable than TPS650231. What is your opinion?

  • 0 in reply to Sajin M
    TI__Mastermind 33380 points
    Hi, Sajin,
    If the current unit is milliampere (mA), I think we don't have a PMIC or even discrete VR can fit the application with efficiency higher than 50%. Would you please let's know more about the application, so, we can recommend a good power solution?
  • 0 in reply to Sajin M
    TI__Mastermind 30260 points

    Sajin M,

    If the maximum load current does not exceed 100mA, then a PMIC will likely be overkill in the application. 

    The PMIC with the best price is the LM26480, which can deliver up to 1.5A on two DC-DC buck regulators and up to 300-mA on two LDOs. All of the voltages can be set externally with feedback resistor dividers and the outputs can be enabled individually with dedicated EN pins.

    The LM10524 is specific to the SSD market and has pre-defined output voltages and sequencing. This will only work in your application if the LM10524 settings match your application perfectly.

  • 0 in reply to Phil Yi40
    Intellectual 360 points

    Hi Phil,

    Sorry to inform that It was my mistake that the unit is not milliampere it was ampere.

  • 0 in reply to Brian Berner
    Intellectual 360 points
    Hi Brian,

    Thank you for your assistance. I am sorry to inform you that the unit of current was not milliampere, it is actually ampere.
  • 0 in reply to Sajin M
    TI__Mastermind 30260 points

    Sajin M,

    It sounds like you have a battery as your input voltage supply, with a range from 3.5V to 4.2V as the input to the PMIC. The majority of PMICs will work within this operating voltage range.

    TPS650231 will still work in your system for Output1, Output2, and Output3. 

    LM26480 will also work, but you would need to generate Output2 from an LDO (Output1 = 3.3V from Buck1 or Buck2, input 3.3V to LDO1 or LDO2 to generate 1.5V at up to 300mA).

    The TPS65218D0 can also work, but you will need to modify the output voltages using the BOOSTXL-TPS65218 to prototype your design.

    You will need to use a discrete Boost IC to generate 5.5V None of the PMICs available will generate 5.5V with an integrated Boost converter.

  • 0 in reply to Brian Berner
    Intellectual 360 points

    Hi Brian,

    Thank you for your assistance. Unfortunately, we need PMIC with the small form factor for our project. So I think the part numbers that you had given are much larger. Because of that, we think  LM10524 will be better for our purpose.

  • 0 in reply to Sajin M
    TI__Mastermind 30260 points
    Sajin M,

    In the LM10524 datasheet, on page 3, the Supply Specifications table lists the pre-programmed output voltages of the DC-DC rails:
    BUCK1 = 2.85V
    BUCK2 = 1.8V
    BUCK3 = 1.0V

    This will not work in your system and the output voltages can only be modified in the TI factory by changing the OTP settings. The LM10524 only has one OTP setting option released to market and we will release any new variations of this device in the future.

    Furthermore, the size of the PMIC package does not correlate directly to solution size.
    The LM10524 is in a 3x3mm package, but the routing away from the PMIC and the large inductors and capacitors at the input and output will make your solution size larger. The pinout of the device is good, but it is an expensive process to route very small vias required in this design.

    With good routing, it is possible to achieve small solution size with larger PMIC package sizes.
    The LM26480 is in a 4x4mm QFN package and has a very symmetrical pinout. This makes the LM26480 ideal for compact solution sizes, especially if you pick very small inductors.
  • 0 in reply to Brian Berner
    Intellectual 360 points
    Brian Berner,

    Thank you very much fro your assistance.