LM2941C: Shutdown current of LM2941C

Hi Chun-Te,

I looked to see if we had any extra data that wasn't shown in the datasheet for this older device but we do not have shutdown current. If you'd like we can measure a unit on the bench to give you an idea of what a nominal unit will behave like.We'll need to order some samples of this device so it'll take about 1.5 weeks for us to get results if that is what you want, just let us know.

Hi Kyle,

Thanks for the response. Before you proceed to measure the shutdown current, can you let me know if TI has any low cost LDO with Enable function? What we need is +5V output with +6V or higher input, and 1A output current. The device should have enable function and has to be through-hole package. Thank you.

Best Regards,

Chun-Te Li

Hi Chun-Te,

Using the requirements you noted, I used our LDO selection tool to narrow down the options and came up with a total of 8 options. Here is the link to that search so you can evaluate the options and further refine it if you want to. 

Hi Kyle,

Thanks for the information. I have narrowed down to LM3856/LM3876. However, when I checked the price on Digikey and Mouser, the price for 1K quantity on these two are much higher than on your website. Do we need to buy from TI to get the good price? Thank you.

Best Regards,

Chun-Te Li

Hi Chun-Te,

Yes, to get the lowest price you'll want to order the parts through TI.com. The prices you see on distributor websites like Digi-Key and Mouser will be higher due to the margin those companies add to the products they sell.  

Hi Kyle,

Thanks for the information. Since the LM2941C has much lower price, we would like to know the life of this product and if you can measure the shutdown current of LM2941C. Thank you.

Best Regards,

Chun-Te Li

Hi Chun-Te,

Yeah we can measure the shutdown current on LM2941C, we ordered samples yesterday just in case you wanted to go forward with that device and we should be able to provide results by October 7th (obviously if we can we'll get you the measurement earlier). 

Hi Chun-Te,

There was an error during the shipping process.
We need to reorder the samples.
I will be doing that right away, but it may take another week for the samples to arrive.

I will keep you updated when I have test results to provide.

Thanks,

- Stephen

Hi Stephen,

Thanks for the update. Thank you.

Best Regards,

Chun-Te Li

Hi Chun-Te Li,

We have received the components and I plan on running the tests tomorrow.

I will reply back with the results.

Thanks,

- Stephen

Hi Stephen,

Thanks for the updates. Thank you.

Best Regards,

Chun-Te Li

Hi Chun-Te Li,

I have tested the device at 15V input and in thermal shutdown.

The 15V input supply measured 60mA current while the device was in thermal shutdown.

Thanks,

- Stephen

Hi Stephen,

So the shutdown current is 60 mA? It sounds pretty high. Thank you.

Best Regards,

Chun-Te Li 

Hi Stephen,

Thanks for the confirmation. Thank you.

Best Regards,

Chun-Te Li