Hello,
We used in the past TPS2202I and later we switch to TPS2228 -TSOP30 because we need support for low voltages.
I do have some questions RE TPS2228 we presently use
· Logic power supply pin
The old TPS2202 had a useful feature for us: it had a separate power supply for the logic core.
In our application case we need to vary the VIN voltage levels. With the new TPS2228 we have to limit the 3.3VIN level to min 3.0V (this supplying the logic power too). This is a big limitation for us and I guess nothing can be done.
Question: The chip doesn’t have somehow any other separate Logic power supply pin, maybe under NC?
· UVLO (under voltage protection) :
With the older TPS2202 we could go over the spec range for VIN (for example with the 12VIN as low as approximate 2.5V).
As I mentioned above in our case we need to vary the VIN over a wider range (ideal is as low 1.1V where I think the switch will be still working), but in TPS228 the UVLO protection kicks-in and disable the switch (true according to spec)
Questions: Is anyway to disable the UVLO feature? Do you plan any new chip with the option to disable the UVLO? Or any chip with a wider VIN ranges?
Mike,
There are no tricky secret pins.
You can't disable UVLO. The chips have a defined low Vin. Internal amplifiers and lofgic do not work below that minimum.
Bob,
Thanks for your quick answer.
Do you know if is any plan for a new device supporting lower voltages (like 1.2V)? More and more DUT are shifting to that direction…
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