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TPS61033EVM: Can a TI engineer verify 3.7V -> 5V @ 2A from TPS61033?

limor fried
Prodigy 10 points
Part Number: TPS61033EVM
Other Parts Discussed in Thread: TPS61033, , TPS610333

Tool/software:

Hi, the datasheet for TPS61033 states "Up to 90.78% efficiency at VIN = 3.3V, VOUT = 5V, and IOUT = 2A" - the TPS61033EVM datasheet states it can do 1A max but the schematic indicates it could do 3A max under a high Vin... however testing on the bench, we can't get more than 1.2A from the EVM or my design with a 0.47uH inductor 3.7V to 5V. (or 1.5A from 4.7V in)

if this part is advertised at being able to do 2A out from 3.3V to 5V, is there any known/proven design for that capability?

  • 0
    TI__Mastermind 18670 points

    Hi Limor,

    When Vin = 3.7V, Vout = 5V, L = 0.47μH, the TPS61033 should output current up to 3A.

    Please check the following items for why the max Iout is small in your test:

    • Please confirm that the unit on the EVM is TPS61033, not TPS610333;
    • Please check whether the current limit of the Vin supply is set too small.

    Regards

    Lei

  • 0 in reply to Lei Zhong
    Prodigy 10 points

    hi the EVM says TPS61033 and the marking is 033, so pretty sure its the right chip.

    right now I only have one power supply (Rigol DP831A) with 5A max output on the 0-8V output, no other current limit set. however, it could be the power supply is faulty - i'll try to find another one.

    have you been able to verify 3A output? or is this just from documentation?

  • 0 in reply to limor fried
    TI__Genius 14950 points

    Hi Limor,

    Thank you for reaching out. Expert for this part is OoO today. Please expect a late reply. Thanks.

    Regards,

    Mulin

  • 0 in reply to limor fried
    TI__Mastermind 18670 points

    Hi Limor,

    Both the theoretical calculation and actual test show that when Vin = 3.7V, Vout = 5V, and suppose the inductor = 0.47μH, the max Iout can reach 3A, provided that the Vin supply is strong enough.

    Regards

    Lei