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TPS2557 Reverse Input-Output Voltage condition

tateo yamashiro
Guru 10890 points
Other Parts Discussed in Thread: TPS2557

Hi,

My customer has questions about TPS2557.
Could you tell me about questoins?

[Question]
- Does the device have internal body diode?

- When EN is Low, it become reverse Input-Output voltage condition. *Vout=6.5V, Vin=0V
  Is there any problem?

- When EN is High, it become reverse Input-Output voltage condition. *Vin=5V, Vout=6.5V
  Is there any problem?

Best Regards,
tateo

  • 0
    TI__Intellectual 2685 points

    Hi Tateo,

    Does the device have internal body diode?

    No, this device doesn't have internal body diode.

    When EN is Low, it become reverse Input-Output voltage condition. *Vout=6.5V, Vin=0V
      Is there any problem?

    TPS2557 has an under-voltage lockout feature. When  VIN<2.35V, The under-voltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn-on threshold.

    When EN is High, it become reverse Input-Output voltage condition. *Vin=5V, Vout=6.5V
      Is there any problem?

    Yes. When EN is high , this device is enabled, and because this device doesn't have reverse voltage protection, VIN may be pulled up to 6.5V(depends on the VIN load), and this will bring risks to the former circuits. 

    I have 2 questions need your help, thank you in advance.

         1. what application will the TPS2557 be used for ?

         2. When VIN=5V, why there exist a 6.5V voltage at VOUT? Under what circumstances  this phenomenon will happen ?


    Respectfully,

    Yongqiang