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TPS7A05: reverse current condition

Yasushi Fujiwara
Genius 11755 points
Part Number: TPS7A05
Other Parts Discussed in Thread: TPS7A03, TPS7A02

Hello Experts,

My customer is considering to design to prevent reverse current condition.
[reverse current condition]
- Vin=0V
- Vout=5V
- workaround: see below block diagram.



The ABS of this device output voltage is Vin+0.3V or 3.6V (whichever is smaller). But reverse current flow will be blocked by Di & R. Does TPS7A05 will get damage by this condition?

Best Regards,
Fujiwara

  • 0
    TI__Genius 13085 points

    Hi Fujiwara-san,

    This is a common way to implement reverse current protection, however the customer's diagram shows Vout=5V which is higher than the normal abs max for Vout and that could damage the LDO due to the overvoltage on that pin. If they require a low Iq LDO which can have Vout forced to 5V externally they may want to look at TPS7A03 or TPS7A02 which can support higher Vout values. They will still need to implement the reverse current blocking diode, and I'd recommend placing a small input capacitor between the diode and Vin in order to help provide a clean input voltage during normal operations.