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TPS63000 extremum

Bruno Henriques
Intellectual 435 points
Other Parts Discussed in Thread: TPS63000

Hi gents,

I would like to use the TPS63000 to provide a 3V DC from either 2 AA battery rechargeable or 1 Li-ion Cell, so input voltage range goes from 1.8V to 4.2V.

I need an average current of 400mA, but the TPS63000 is switching off when voltage drops bellow 2.3V, could you explain how can i determine the minimum input voltage for my 400mA current output? and what is the maximum current when the input is 1.8V?

Thanks for your help.

Bruno

  • 0
    TI__Expert 8420 points
    Hi,
    I measured on the EVM of the tps63000
    -min input voltage for a 400mA load: ~2V
    -Maximum load for 1.8V input: ~250mA
  • 0 in reply to Sabrina
    Intellectual 435 points
    Hi Sabrina, Thanks for your reply,the pin PS/Sync is connected to Vin? or to Vin using the R4 pull up?
    on my design i've got PS/Sync connected to Vin using 1mohms resistor and L1 is a 3.3uH, R1 and R2 are 1.1M / 220k in order to get 3V output.
    Maybe i've got somethin wrong in my design.
    thanks
    Bruno
  • 0 in reply to Bruno Henriques
    TI__Expert 8420 points
    Hi,
    According to the measurements I did it is not possible to get an output load of 400mA with Vin =1.8V. I would use a better power source for the converter to get the desired output conditions of 400mA.
    Your resistive divider looks fine. Regarding the PS pin I would directly connect it to Vin if the resistor is not part of a RC tank at the input like in the datasheet (www.ti.com/.../tps63000.pdf ), and of course if you want your converter to always operate in forced PWM mode.