How can I convert a PSD to a PDF and have each layer as a new page?

Hi there... I have a bunch of images for print and the printer wants them in a single PDF file.. with each image on a page. They are all the same width and hight and DPI. They are currently all individual images saved on the hdrive....  as 800DPI PNGs, all the same dimentions.  (it is a bunch of player card backs and fronts)

How can I get all those images into a single PDF file, with a single image on each page? I know I can save as a PDF but it only saves the merged viduable layers, kind of like save as png. I can use a script ot action to save a new PDF for each layer... but then I need to somehow combine them.

Is there a way to save a PDF file, with each layer as a seperate page, with no changes to the image file DPI or scale and have no quality loss? If so how can I do this? Or is there a better way to get a bunch of sequential PNG images into a PDF with each image on a diffrent page with no quality loss?

Thanks!