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TPS62172: What will be Vout after UVLO

Dharmik Bhavani
Prodigy 10 points
Part Number: TPS62172


Strange the part number TPS62172DSG has not been detected anyways I am using TPS62172DSGR in my project. 

My project has a charging IC with over-voltage protection and was thinking to use TPS62172DSG for converting battery voltage to stable 3.3v.

After reviewing the datasheet I got to know that TPS62172DSG has an under-voltage cut-off UVLO inbuild at  >2.7V. 

So my question is as followed:
1) once voltage is below 2.7V it will enter in UVLO and at this point, my load will get 0V or there will be some voltage load will see at Vout?

2) Can I avoid using additional low voltage protection circuitry in my PCB as TPS62172DSG has UVLO? To reduce my BOM cost.

3) with enabled low Vout will be 0V or it will have some voltage on it?

Thank You for your help.

  • +1
    TI__Mastermind 49470 points

    Hi Dharmik,

    1. Once input voltage is below 2.7V, the converter stops working, at this point, output voltage will be 0V.

    2. No, you could not avoid UVLO since it is build-in feature inside silicon.

    3. No output voltage if UVLO is triggered.

    Thanks,

    Nancy

  • +1 in reply to Nancy Zhang
    Prodigy 10 points

    You misunderstood my question no.2 I was asking if TPS62172DSG  has built-in low voltage cut-off protection so can I rely on that and not use any additional low voltage protection like DW01 or similar?

  • 0 in reply to Dharmik Bhavani
    TI__Mastermind 49470 points

    Hi Dharmik,

    The UVLO is the build-in low input voltage cut-off protection with typ 2.7V below input voltage. If you can accept 2.7V typ, you don't have to use any additional low voltage protection. If the input voltage drops below 2.7V typ. the under-voltage lockout prevents mis-operation of the device by switching off both the power FETs.

    Hope this helps,

    Thanks,

    Nancy