Hi Albert,
While we have not attempted to parallel the two LDOs, it is theoretically possible. You should be able to apply many of the same design principles from the TIDA-00270.
Again we have not attempted to parallel the LDOs, but since the current…
Hi Yi,
The Vout and current requirement drastically limit the options available. One thing you could consider is paralleling two TPS7A47 LDOs similar to TIDA-00270. This would give you your voltage and current requirements but will take more components…
I agree with John that starting with an inverting buck boost to start. You can clean up the rail with a negative LDO; however, we do not have a 2A negative LDO at this time. You could use two LDOs in parallel such as in TIDA-00270 in order to hit your…
Hi Nick,
We have not characterized TPS7A47 with an external pass device to boost current; however, theoretically it should be possible.
Paralleling is a proven option for some applications. We do have a TI Design that explores this topic: www.ti…
Hi Robert,
Due to the reverse-current protection, there will not be reverse current as long as the output is greater than 1.8V.
TPS709 is a fixed output voltage device and is not meant for current sharing applications. Below is a link to a Current…
Hi Niels,
We do not have a 4A negative LDO at this time; however, the principles in the following reference design should be able to be applied to a negative LDO such as TPS7A33 http://www.ti.com/tool/TIDA-00270?keyMatch=current%20sharing&tisearch=Search…
Alex,
Per TIDA-00270, you'll have to sense current at the inputs of each LDO with the OPA333. Like you said, you can set the master output voltage with ANYOUT pins and leave the ANYOUT pins floating for the slave device. The OPA333 output should be…
Hi ,
How much current do you need in your application? TPS7A33 is a similar LDO rated for 1A.
If you would prefer to parallel two TPS7A30 to current share, the following TI Design would be a good reference for you:
www.ti.com/.../TIDA-00270
…
Hi Robert,
How much current would the total load be when the circuit boards are all tied together?
When multiple outputs are tied together, each LDO output will be slightly different. Whichever output is highest will carry the entire load. This…
