Load Switch turn off when input voltage drop low

Hi Prescott,

By connecting VIN and ON, the device will turn off when VIN goes low and turn on when VIN goes high.  If you would like the enable (ON) pin to be controlled separately, then the input voltage dropping low would also drop the output voltage low if the device was still enabled.  Why is it necessary to have the switch disabled when VIN goes low?  Are you looking to implement a reverse current protection feature in one of our switches?

Thanks,

Alek Kaknevicius

Hi Alek,

Because customer connect load switch to PMIC.

Just as you mention, if the the input voltage dropping low would also drop the output voltage low, then the PMIC will malfunction.

By the way, do we have any very low Iq load switch?

Thanks.

Prescott

Hi Prescott,

If the input voltage on the load switch drops and the device is turned off, then what will be keeping the PMIC voltage high?  Is there another source on the output of the load switch to prevent PMIC malfunction?

If this is the case then you would want to look for a load switch without our QOD feature (quick output discharge).  This feature pulls the output of the load switch to 0V through a resistance to ground rather than leaving the output floating.

When you are referring to a low Iq, are you referring to quiescent current (current dissipated through the device when turned on) or shutdown current (current leaking into the device when turned off)?  Also, what range of Iq are you looking for?

In general, our TPS22901 may be a good fit. This device does not have QOD and has the currents specified below:

Let me know if this device would work or if you have any additional questions.

Regards,

Alek Kaknevicius