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TLV713: the input and output voltages are exactly the same, and there is no regulation function

Part Number: TLV713

Hi 

I have a question about TLV71333PDBVR.

For battery-powered applications, the input voltage is 2.6V ~ 3.2 V, and the output must be stable at 3.3V. The circuit schematic is as follows.


The problem is that when the input voltage of the chip is 2.6 ~ 3.2V, the output is not stable at 3.3V, but is consistent with the input voltage;
When the input voltage is reduced, the output voltage of the chip is also reduced, the input and output voltages are exactly the same, and there is no regulation function. Why is this and what do I need to modify?

Thanks & BRs

Elsa Duan

  • Hi Elsa,

    An LDO can only regulate a lower voltage. If you have a fixed 3.3V LDO and the input voltage is less than 3.3V, it will be working as a load switch with the output voltage being VIN-VDO.

    If you need to regulate 3.3V from a lower input voltage, you need a boost converter.

    I hope this helps.