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TPS61033-Q1: Input and Ground Shorts at power ON

Aleric Pinto
Prodigy 10 points
Part Number: TPS61033-Q1
Other Parts Discussed in Thread: TPS61033EVM

Tool/software:

Hello,

I am using a TPS61033DRLR to boost an input voltage of 3V to 5V. I have connected the circuit as recommended by the datasheet however when I apply 3V to the input. Immediately the Input and Ground pins show as a short and it draws huge current from my DC power supply. Seems like the internal MOSFET at the SW and GND pin blows up. Need urgent help in this matter.

(Cin and Cout are both 10uF, 16V)

I have re-checked the connection multiple times and have blown up 3 ICs already.

Thanks,

Aleric.

  • 0
    TI__Genius 12445 points

    Hi Aleric,

    Do you use the TPS61033EVM to test or your own boards? Could you please share your schematic if you are using your boards to test so that we could check if there is any risk from the layout. Bad layout would reduce the internal FET at the SW and GND damage.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Prodigy 10 points

    Hi Nathan 

    Thanks for your reply. I am actually just testing the circuit without a load on my DC power supply to check if it can provide the desired output voltage.

    So earlier My wires were too long and now after i brough the capacitors and resistors close to the IC, my Input doesn't short anymore, however now my output voltage is always 0 no matter what input voltage I apply. 

    I have assembled this circuit on a general purpose board using wires and jumpers and tried to match the suggested layout in the datasheet as much as possible.

  • 0 in reply to Aleric Pinto
    TI__Genius 12445 points

    Hi Aleric,

    I am not sure how you setup the general purpose board by using wires and jumpers, but we do recommend to test with our standard EVM or build a standard PCB to test, some parasitic inductance or resistance may introduce unexpected impact on our device.

    Regards,

    Nathan