TPS63031: Quiescent current problem. It doesn't go below 330uA

Salih Onur ZORLU

Part Number: TPS63031

Hi,

I have an issue about quiescent durrent. I already discussed this topic here. Then I decided to re-design the PCB properly as same as the suggested design. But the problem hasn't been resolved yet. Please help me what is wrong?

over 5 years ago

0 Jasper Li over 5 years ago

TI__Mastermind 46905 points

Hi Salih,

I guessed you should removed all the external components except the input capacitor, output capacitor and inductor for the buck-boost, correct? make sure all the current is caused by the buck-boost circuit

if yes, please follow https://www.ti.com/lit/an/slva828/slva828.pdf?&ts=1589761823293 to setup the bench for current measurement. it is for boost, but the principle is the same as buck-boost. make sure the VIN and VOUT are stable before measuring the current.

0 Salih Onur ZORLU over 5 years ago in reply to Jasper Li

Prodigy 60 points

Thanks very much Jasper.

I don't know how mega-ohms on trigger circuit cause >300uA consumption but it happened. I removed all components except Cin, Cout and L components. The quiescent current has been dropped down below 50uA.

I added MCU and other ICs and also I can see that whole circuit consumes around 70uA in sleep mode. That is better than I aimed.

0 Jasper Li over 5 years ago in reply to Salih Onur ZORLU

TI__Mastermind 46905 points

good to know the issue is solved. I closed the post. but you could still reply it if there is further problem.

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TPS63031: Quiescent current problem. It doesn't go below 330uA