LM3881: looking for 4 rail power sequencer

Hello Matt,

The LM3881 can be cascaded with another LM3881 so you can manage up to 6 rails with the use of two LM3881 (additonal circuit elements are needed). See the following link for more info on cascading. https://e2e.ti.com/blogs_/b/powerhouse/posts/sequencing-solutions-simple-reliable-and-cost-effective

If you want a single IC solution I would recommend UCD9081 or UCD9090. The UCD9081 is a 8 rail and the UCD9090 is a 10 rail sequencer. With these you have much more flexibility can also monitor the voltage on your rails and program each rail with individual delays or dependencies on other rails. If you would like to track temperature or current as well UCD9090 is the better choice.

UCD9081 - https://www.ti.com/sitesearch/docs/universalsearch.tsp?langPref=en-US&searchTerm=ucd9081&nr=139#q=ucd9081&numberOfResults=25 

UCD9090 - https://www.ti.com/sitesearch/docs/universalsearch.tsp?langPref=en-US&searchTerm=ucd9090&nr=347#q=ucd9090&numberOfResults=25 

Let me know if you have any further questions.

Best Regards,

Samuel Gradinaru