add ADuM5000 (alias from ADuM6000)

it's basically the same chip, just with a lower protection rating

library/analog_devices.dcm

@@ -48,6 +48,12 @@ K Digital Isolator
 F http://www.analog.com/media/en/technical-documentation/data-sheets/ADUM1410_1411_1412.pdf
 $ENDCMP
 #
+$CMP ADuM5000
+D Isolated 2.5 kV DC-to-DC Converter, SOIC-16W
+K isolated converter
+F http://www.analog.com/media/en/technical-documentation/data-sheets/ADuM5000.PDF
+$ENDCMP
+#
 $CMP ADuM6000
 D Isolated 5 kV DC-to-DC Converter
 K Isolated DC-to-DC Converter 5kV

library/analog_devices.lib

@@ -779,6 +779,7 @@ F0 "U" -400 500 50 H V L CNN
 F1 "ADuM6000" -400 -600 50 H V L CNN
 F2 "" -500 300 50 H I C CNN
 F3 "" -500 300 50 H I C CNN
+ALIAS ADuM5000
 $FPLIST
  SO-16-W*
 $ENDFPLIST