Identify "ZL5P" IC in laser driver
In order to show you how I came across the link, here's what I did. It could prove useful in the future to know how to refine keyword searches to find what you want for any generic IC, etc.

Searched Google for "zl5p SOT23," first result was "Aliexpress.com : Buy 20pcs KB4317 ZL54/ZL5P SOT23 6 from ..." This result has some extra information, namely the string "KB4317."

As such, I started a second refined search for "KB4317 zl5p SOT23," which led to the first result being the link I posted in my comment from alldatasheet that shows the details to be a Kingbor constant-current LED driver IC: http://www.alldatasheet.com/datasheet-pdf/pdf/212243/KINGBOR/KB4317.html