moved L5973D to dc-dc.lib and some minor changes

library/dc-dc.dcm

@@ -238,6 +238,12 @@ K PWM step down buck converter controller synchronous POL
 F https://www.intersil.com/content/dam/Intersil/documents/isl8/isl8117.pdf
 $ENDCMP
 #
+$CMP L5973D
+D 2.5A step down switching regulator
+K step down buck regulator
+F http://www.st.com/resource/en/datasheet/l5973d.pdf
+$ENDCMP
+#
 $CMP LM2574HVH-12
 D LM2574N, 12V, 0.5A Step-Down VR, High Votage Input
 K SIMPLE SWITCHER® Step-Down Voltage Regulator 12V 500mA HV

library/dc-dc.lib

@@ -330,6 +330,30 @@ X SGND 17 0 -600 100 U 50 50 1 1 W
 ENDDRAW
 ENDDEF
 #
+# L5973D
+#
+DEF L5973D U 0 40 Y Y 1 F N
+F0 "U" -100 525 50 H V R CNN
+F1 "L5973D" -100 450 50 H V R CNN
+F2 "Housings_SOIC:SOIC-8-1EP_3.9x4.9mm_Pitch1.27mm" 150 -450 50 H I L CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ SOIC*1EP*3.9x4.9mm*Pitch1.27mm*
+$ENDFPLIST
+DRAW
+S -400 400 400 -400 0 1 10 f
+X OUT 1 500 200 100 L 50 50 1 1 O
+X SYNC 2 -500 200 100 R 50 50 1 1 B
+X INH 3 -500 0 100 R 50 50 1 1 I
+X COMP 4 -500 -200 100 R 50 50 1 1 P
+X FB 5 500 0 100 L 50 50 1 1 I
+X VREF 6 500 -200 100 L 50 50 1 1 O
+X GND 7 -100 -500 100 U 50 50 1 1 W
+X VCC 8 0 500 100 D 50 50 1 1 W
+X EP 9 100 -500 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # LM2574HVH-12
 #
 DEF LM2574HVH-12 U 0 40 Y Y 1 F N