This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: TPS7A49
I need a 200mA capable LDO, with a Vref that is identical to the TPS7A3001 (complimentary negative LDO).
The TPS7A49 Datasheet (SBVS121E – AUGUST 2010 – REVISED MAY 2015), claims I_lim (min) is 220mA, but elsewhere all the documentation refers to 150mA.
Which is correct?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to kai klaas69:
As kai klaas69 mentions both statements are correct. TPS7A49 is designed, tested, and characterized for loads up to 150 mA; however, the current limit protection feature will engage at 220 to 500 mA. The current limit is a protection feature and is not meant for normal operation.
In order to help you select another LDO could you tell us more about your application requirements? What is your Vin and Vout? Are there any specific features that you are looking for?
Hi kai klaas69,
Please note that the 90% is a test condition used to force current limit during the test sequence. When Vout is bellow the regulated voltage, the error amplifier of the LDO will drive the pass element as hard as possible allowing as much current to flow through the LDO in an attempt to bring the output within regulation. During our test sequence Vout is held outside of regulation; therefore, we are forcing current limit to engage so that we can measure the current limit.
In a real application, the LDO may or may not be in regulation still depending on application conditions even in current limit.
In reply to Ryan Eslinger:
In reply to user4544767:
Thank you for the concrete recommendations.
As the TI article for the tracking supplies as the feedback as a "servo" voltage feedback - I guess that the bandwidth of most positive regulators would be sufficient (with regard to loop stability), so I consider various LDOs for the 200mA positive supply?
PS could the TPS7A49 be paralleled for greater current output?
While I agree with kai klaas69 that care must be taken to properly design a parallel LDO application, it is a possibility. We typically do point out our higher current LDO solutions as they use fewer components and are simpler to design into an application; however, there can be some advantages to paralleling LDOs. For instance you will split the heat dissipation and you can even reduce the output noise from the LDO itself. Here are two TI Designs that you can use as references as you decide if you want to go down the paralleling path:
Thank you for the links - I'll probably just bite the bullet and go for a 1A regulator :)
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.