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tps63001 IC not working properly

shahbaz sarik
Prodigy 200 points
Other Parts Discussed in Thread: TPS63001, TPS63000, TPS63031, TPS63050

I want to drive a sensor node using TPS63001, all the modules in the node work at 3.3V. In active mode it takes around 150mA current and in sleep mode it takes around 80uA, the node is driven by a 3.7V, 1150mAh li-ion battery.

I got the PCB for TPS63001 using the gerber file given on TI website (TPS63000 EVM-148). I was operating it in power save mode, for some IC's the output was not remaining constant 3.3V, it was varying with the input voltage.

Some IC's were giving constant 3.3V but it was taking too much current, under no load condition it was taking current in the range 5-250mA. For some IC's they worked fine for some time i.e they were taking no load current in the range (90-300uA) but when I was testing it for different loads, at some random load condition something happened and then it also started taking very high no load current (around 120-130mA). During operation some IC's get heated very much.

During operation the IC's produces a hissing sound.

Here are a few thing which I would like to know

1. Why the IC's are behaving in this manner?

2. What can be the possible sources of error?

3. I am not using machine soldering can it be an issue?

4. I am using inductor from a local vendor instead of coilcraft, can it cause a problem?

5. What is the proper way to test a buck-boost converter?

Please let me find a way so that it works normally.

Please suggest the best buck-boost for my design, after repeated failure with TPS63001 I was planning to move to TPS63031, is it good?

Thanks in advance

  • 0
    TI__Expert 7110 points

    For an SMPS design, it is very important to take care on the whole analog circuit in terms of components and layout.

    From what I understood, you took the layout of the Evaluation Module - A good starting point. Basically it is important to keep the capacitors a close to the chip with the shortest wires possible (same for the inductor) - as well make sure the GND connection is a common plane with shortest connections to the capacitors; like it is done on the Eval. Module layout.


    1. There are issues causing the IC to operate like this. It's hard to judge the specific reason
    2. Could be issues in the steps given above; As well Assembly, Soldering, ESD, wrong components...
    3. Yes, that definitely can cause issues
    4. Could be as well. Please try the Coilcraft inductor and check whether you still see issues to narrow down the error-source. Please makes sure to select the inductor as described in the datasheet.
    5. Please test the stage by supplying it and vary the load. Once you see abnormalities, please observe VIN/VOUT/SW nodes and check it's behavior.


    Depending on your input voltage range, TPS63050 could be a good fit for you.

  • 0 in reply to Florian Feckl
    Prodigy 170 points
    Hi, I have also problem with tps63001. On my final board, where 2 condensators and inductor are very close to tps63001 - converter consume about 3.5ma in idle mode. On my test board with same parts and higher distance between them tps63001 works as it should. I am very confused. Final board has 0.4mm thickness and test board 1mm. I really need help:/