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I am designing a custom mini PCIe card. What is the max power I can draw from the 1v5 rail, and the 3v3 rail?

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The document your looking for is called PCI EXPRESS MINI CARD ELECTROMECHANICAL SPECIFICATION. You can find the PDF on the homepage of the PCI-SIG if you are a member or on your favorite search engine. The most recent revision seems to be 2.1.

In the older version 1.2 I have on hand, it says in 3.4.3 Power:

  • 1100 mA (2750 mA) normal (peak) current on 3.3V
  • 375 mA (500mA) normal (peak) current on 1.5V
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