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TPS61256: Operation in the case of VIN>VOUT(5v)

Hidekazu Someno
Expert 5130 points
Part Number: TPS61256

Hello,

Is there any problem(Damage or anything) to IC in case IC is put in the conditions like that(VIN>VOUT(5v)) in actual application?

Best regards,

Hidekazu Someno

  • 0
    TI__Expert 5130 points
    Hi team,
    Please let me supplement about my questions

    In the case of TPS 61256, Vout setting is 5 V.
    If VIN increases over VOUT(5V) and stays in the range of 5V-5.5v, It should have 0% duty operation(100% on for PMOS) and the state of Vin ≒ Vout (Vin - load current x FET Ron exactly).
    Is there any risk that leads to any damage by putting this product in this state(5V < VIN <5.5V)?

    Best regards,
    Hidekazu Someno
  • 0 in reply to Hidekazu Someno
    TI__Mastermind 40080 points

    Hi Hidekazu-San,

    Yes, when Vin>Vo, Vo will follow Vin, Vo=Vin-I*FET Ron.   It is OK for this usage, will not cause any damage.