FDC638APZ Datasheet, Fairchild Semiconductor

* Max rDS(on) = 43mΩ at VGS =
  –4.5V, ID =
  –4.5A
* Max rDS(on) = 68mΩ at VGS =
  –2.5V, ID =
  –3.8A

load switching and power management,battery charging circuits,and DC/DC conversion. Application
* DC - DC Conversio.