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TPS22912/913/930 differences

Umberto Frangi
Expert 4045 points
Other Parts Discussed in Thread: TPS22913

Hi,

I got this email from a customer and really it is not easy to understand the differences between the devices reading datasheets;rise time and output discharge are different , but reverse protection is not clear:

We're in trouble understanding well the difference between the following parts
Intended use is as controlled switches for OR-ing power supply sources

TPS22912
Reverse current protection is always active, even when the device is disabled.
Additionally, under-voltage lockout (UVLO) protection turns the switch off if the input voltage is too low.

TPS22913
The reverse current protection is active when the power switch is enabled (ON).
Additionally, during under-voltage lockout (UVLO), or when the switch is disabled, no reverse current can flow as the switch body diode is not engaged



TPS22930
Reverse current protection is active only when the power-switch is disabled (off).
The device disengages the body diode when the output voltage (VOUT) is driven higher than the input (VIN) to stop the flow of current towards the input side of the switch.
Additionally, under-voltage lockout (UVLO) protection turns the switch off if the input voltage is too low.

- - -
It is not clear wich is the difference between TPS22912 and TPS22913, as TPS22912 has RCP always enabled, but TPS22913 has RCP "active when power switch is enabled" , and "when the switch is disabled, no reverse current can flow"
It seems that TPS22913 has RCP always active, too

TPS22930 seems to become a bi-directional switch when enabled, and stop current flowing in both directions when the switch is disabled, is it right ?


TPS22930 seems unusable for ORing power supplies, as when the switch is enabled it allows current flowing back from higher voltage source to lower voltage source

TPS22912 seems more suited to build ideal diode ORing, but it is not clear wich is the difference with TPS22913
Prototypes build using TPS22913 show unclear behaviour, they do not seem to act as ideal diodes, like if the statement "or when the switch is disabled" is not true

Thanks

  • 0
    TI__Intellectual 2190 points

    Umberto,

    The TPS22912 and TPS22913 have reverse current protection active when the device is both on and off. These devices can be used in an OR-ing configuration, since the reverse current protection can prevent reverse current flow into the VIN. The main difference between the TPS22912 and TPS22913 is the Quick Output Discharge (QOD), as you have noted.

    The TPS22930 has reverse current protection active only when the device is off, so reverse current can flow through the device when the device is on.

    Thanks,

    Ben