Hi Nitesh,
Between the switch from 3.3V to 2.5V, can the power to the system drop down to 0V, or is a seamless transition required? One of our simplest solutions is the TPS22910A + TPS22912C (as shown below).
These devices are both load switches…
Hi Dimitri,
This is my original picture:
As you can see (I hope it worked this time), I have 3x sources: 2x from USB host (5V) + 5V from a DC-DC (from TI of course!) with an enable. The DC-DC can work with a pre-biased output, so I connected it…
Hi Zhengquan,
What is the voltage and current levels in this application? What kind of UVLO control is needed?
Off the top of my head I would suggest taking a look at TPS22953 and TPS22954 which implement a UVLO similar to TPS22810.
You can…
Hi Kai,
Apologies, the TPS22963C only has reverse current blocking when the device is OFF. Some of our devices have "always-on" reverse current blocking, where the comparison between VOUT and VIN is used, (such as the TPS22916, TPS22912C).
In regards…
Hi Vincent,
Our closest, simplest solution is using the TPS22912C and TPS22910A as described in the application note below (section 2).
To suggest other possible solutions, it would also be helpful to know the following:
What two voltages are…
Hi Stefan,
Can you take any oscilloscope shots showing that the input voltage is low on the unused channel before switching over?
As mentioned previously, it will be difficult to guarantee that U802 remains OFF during switchover. If any voltage…
Hello Daniel,
LM34904 mentioned earlier
www.ti.com/.../LM34904 - 5.3V, 500mA, 360mΩ, Current Limited Power Switch ,
BGA package
The TPS22912C is another great load switch for your need.
www.ti.com/.../TPS22912C
5.5V, 2A, 61mΩ Load Switch With…
Hi Rick,
Apologies, I think I'm adding to the confusion. Let me try to explain reverse current blocking differently:
We have two types of RCB: "always-on RCB", and only when the EN/ON pin is low.
Devices that contain "always-on RCB" will activate…
Hi Cris,
Thanks for reaching out on E2E!
To reiterate your configuration, you have the TPS22916 connected in the above circuit, in a power mux configuration, with it blocking reverse current whenever the 3.6V LDO is enabled. Is my understanding correct…
Hi Carmen,
The TPS22976 does not offer any reverse current blocking when turned off. This means that if one of the supplies is higher than the other, then when that supply is powering the system there will be current flowing backwards into the lower…
