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DR for TPS63010 schematics

Ariel Stern
Prodigy 90 points
Other Parts Discussed in Thread: TPS63010, TPS63020

Hello There,

 

My application is powered by one 3.7 non rechargeable lithium cell and I am planing to use the TPS63010 in order to maintain the 3.5-3.6 V through out the battery life cycle.

my cut off voltage is 3.3V.

The average current consumption is 50mA with transmission peaks of 2 A.

R39 is intended for override the TPS. It will not be assembled.

 

I attached my design and I would appreciate if you can please support me with design review.

My main questions are:

  1. Is the peripheral components (especially R40 R41 & L5) fit my needs?
  2. Is VINA and VIA1A is correctly connected to GND? I took that from the reference design.
  3. Is L5 coil - http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=490-5120-1-ND  is a good choice? And if not what do you recommend?

 

When I will have the final layout I will post it here as well for additional comments.

Thanks in advance

 

Ariel

POWER SUPPLY.pdf
  • 0
    TI__Guru**** 150820 points

    As shown on page 16 of the datasheet, VINA and VINA1 need to be connected together, with a decoupling capacitor.  VINA1 is the output of the 100 Ohm resistor which provides a low pass filter to the VINA input.  VINA is the power for the control circuitry.

    Be sure and use quality capacitors with an X5R dielectric.

    With your current feedback resistors, your output voltage will be 3.8V.  To get a 3.55V output, use a 1.1Meg for R40.

    For a 2A output, the IC will most likely hit current limit.  The peak current in the switches during buck operation is the output current plus 1/2 of the ripple current.  During boost operation, it is higher than that.  We just released the TPS63020, which has 4A switches.  If the 2A transmission pulse is longer than a few usec, then it is basically a steady state load, because it lasts longer than a few switching cycles.  Thus, everything should be sized to provide 2A steady state.  Your inductor is way underrated for a 2A output and will definitely saturate.  Please use the inductors recommended in the datasheet on page 20.

    Follow the layout guidelines on page 21.

    We do have an EVM for this device that you can modify to your conditions and using your inductor.  Modifying the EVM is a low risk approach to getting the design correct without having to spin a board.

    What else do you have on this board that we can help you with?