TPS7A90: LDO as a load switch

Hi Prudhvi,

yes, this should work.

Which sensor are you planning to use?

Kai

Hello Kai,
I am planning use the sensors fromMaxbotix. www.maxbotix.com/.../MB7334.htm.

Regards,
Prudhvi Sagar

Hi Prudhvi,

this should work.

Kai

Hi Prudhvi,

Are you intending to use TPS7A90 as an LDO or a Load Switch? From your statements it sounds like you are intending to use the TPS7A90 as an LDO in order to regulate the output voltage and that you simply need to enable/disable the LDO in your application. A load switch is a different type of application (you can read more about load switches here: www.ti.com/.../slva652.pdf ). Do you need a load switch or is the enable function of the LDO enough to satisfy your application requirements?

Very Respectfully,
Ryan

Hello,
Thank you for the support. Leakage current (2.3) is not an issue as TPS7A90 also has low Q, shutdown and ground current. I need to check slew rate (2.4) and power down rate (2.5). Other than these can there be any more issues?

Regards,
Prudhvi Sagar

HI Prudhvi,

As long as VOUT is set higher than VIN, the LDO will operate as a switch. The TPS7A90 is a good choice, I think you may want to look at the TPS7A35 as well.

Regards,

Hello, 

If Vout is set higher than Vin LDO will not work right? TO turn OFF the LDO I can directly use EN pin right?

Regards,

Prudhvi Sagar

Hi everybody,

I think there's a bit confusion about the term "load switch". Prudhvi has a sensor which he wants to turn-on by just applying a supply voltage. And he wants to turn-off the sensor by ramping down this supply voltage. That's why he wants to use a voltage regulator with an output enable.

Kai

Hello,
I am slightly confused now whether to use it or not :(.

Mu requirements:
I need my sensor to get regulated voltage.
I need to turn it off using a GPIO pin
I need the device to consume less power when turn off


Regards,
Prudhvi Sagar

Hi Prudhvi,

I see no problems. I give you a "go".

Kai