Switch between 2 DC Power Supply Sources

Hello again,

   Can I use the TS5A3153 chip for my application. The max current requirement for either supply (S1 and S2) is 300mA?. So the pin assignments look something like this:

V+ = 5V

NO = S2 (refer figure above)

NC = S1 (refer figure above)

/EN = GND

COM = V1 (refer figure above)

Regards,

Vineet.

Vineet,
but TS5A3153 gives maximum of 200mA current.
could you please send your requirements in details ..in word doc or pdf.
unable to see your figures.
Regards
Dinesh

HI Dinesh,

  My requirement is very simple.

There are 2 DC power sources: S1 ( can be at 1.8V, 3.3V or 5V ) and S2 ( 3.3V only )

Either of the two sources will power a chip (U1). (U1 can draw max 300mA and can operate on either of the three voltages.)

Solution 1:

SPDT mechanical relay is one option to solve this.

Problem:

But I dont want noise in the circuit. So I am looking for chip solutions.

Solution 2: (refer the pdf file attached)Solution2.pdf

Use TPS22929D power switch for S1 and S2, and turn on either on.

Problem:

I will have to connect a sckotty diode to protect the out of the TPS22929D which will cause a 0.4V output voltage drop at best. So I cant use this also.

I hope I am able to explain my problem.

Do you have another part with higher current capacity? or any other way to select DC Power from 2 sources to power one IC.

Regards,

Vineet.

Please study TPS211x

www.ti.com/.../tps2113
Hope this solve your problem.

Regards
Dinesh

Hi Dinesh,
It does not support 1.8V on the low side, any other chip?

Vineet.

Hi Dinesh,

  Thanks, will try this chip.

Vineet.