footprints: generic DC-DC converter (to replace AP3429/A)

footprints/dcdc_converter/dcdc.dcm

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+EESchema-DOCLIB  Version 2.0
+#
+$CMP DCDC
+D DC-DC Converter
+K DC converter swtiching step down
+$ENDCMP
+#
+#End Doc Library

footprints/dcdc_converter/dcdc.lib

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+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# DCDC
+#
+DEF DCDC U 0 40 Y Y 1 F N
+F0 "U" 0 150 60 H V C CNN
+F1 "DCDC" 0 50 60 H V C CNN
+F2 "" 0 0 60 H I C CNN
+F3 "" 0 0 60 H I C CNN
+$FPLIST
+ TSOT25
+$ENDFPLIST
+DRAW
+S -400 200 400 -200 0 1 0 N
+X EN 1 -600 -100 200 R 50 50 1 1 I
+X GND 2 0 -400 200 U 50 50 1 1 I
+X LX 3 600 100 200 L 50 50 1 1 I
+X VIN 4 -600 100 200 R 50 50 1 1 I
+X FB 5 600 -100 200 L 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
+#End Library