TPS61027: Failure of the component (short-circuit between VIN and GND)

Manuel Repullo

Part Number: TPS61027

Hello,

I am using the TPS61027DRCR regulator to convert a 4-cell battery (3.6V to 6.5V) to 5V. When I start testing the PCB, I see a sudden increase in current because a short-circuit is produced between the input voltage (VBAT) and GND. This short-circuit is made by the TPS61027 when it breaks down. The short-circuit disappears when I remove the component.

I have attached an image of the schematic and the PCB in case someone sees an error in what's happening. Notice that R10 is not fitted (I just made the footprint in case it was needed). The EN pin is asserted with an auxiliary circuit controlled by a button and a flip-flop (it is set to high at VBAT voltage).

Thank you very much in advance for your help!

3 months ago

0 Nini Zhong 3 months ago

TI__Expert 5085 points

I didn't see any errors in the schematic. Could you check if this device doesn't break down, test if the low side mosfet and high side mosfet still work? Test the SW and GND , SW and VOUT body diode.

0 Manuel Repullo 3 months ago

Prodigy 10 points

Hi,

Thanks for your help. How can I test that?

0 Nini Zhong 3 months ago in reply to Manuel Repullo

TI__Expert 5085 points

Firstly you can the SW and GND , SW and VOUT body diode, as I told you。

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TPS61027: Failure of the component (short-circuit between VIN and GND)