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Discussions LTM8074 generate -8V output and when make the RUN pin to low,-8V output still exists on the output

LTM8074 generate -8V output and when make the RUN pin to low,-8V output still exists on the output

bsmdyy

on Oct 17, 2022

Category: Hardware

Product Number: LTM8074

Dear ADI colleagues,

My customer use LTM8074 to generate -8V output voltage and it is ok.But when the customer want to shutdown the output of LTM8074 by connect RUN pin to GND,it cannot work.-8V output still exist on the output of LTM8074.I attach the schematic as follows，and the green components in the schematic are not mounted.

please help check when output negative voltage,if it's possible to use RUN pin(connect to <0.9V) to shutdown the LTM8074.

with best regards&thank

Heng

Tags: µModule Buck Regulators hardware LTM8074 µModule Regulators

MacManato

on Oct 17, 2022 10:55 PM
Hi, Heng.

Moving this inquiry to the Power Management forum. They will be able to help you best on questions about regulators.

Thanks,
Mac
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Mikee_Lacson_00

on Oct 17, 2022 11:11 PM
Hi Heng,

Please refer to the article linked below for the proper connection for run pin for this case

https://www.bing.com/ck/a?!&&p=7935afc6af5aebcdJmltdHM9MTY2NTk2NDgwMCZpZ3VpZD0xYTczMGYyZC1mMTI1LTYxMjAtMTRiYy0xZDZkZjA0ZTYwZGMmaW5zaWQ9NTE3OA&ptn=3&hsh=3&fclid=1a730f2d-f125-6120-14bc-1d6df04e60dc&psq=Design+Note+1021&u=a1aHR0cHM6Ly93d3cuYW5hbG9nLmNvbS9tZWRpYS9lbi9yZWZlcmVuY2UtZGVzaWduLWRvY3VtZW50YXRpb24vZGVzaWduLW5vdGVzL2RuMTAyMWZhLnBkZg&ntb=1
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