Adding tiny buck regulator

TripwireHook.dcm

@@ -54,6 +54,10 @@ K USB Hub
 F https://datasheet.lcsc.com/lcsc/1811151645_CoreChips-SL2-1A_C192893.pdf
 $ENDCMP
 #
+$CMP STI3408B
+D 1.2A, 6V, 1.5MHz Synchronous Step-Down Converter
+$ENDCMP
+#
 $CMP WS2812B-2020
 D RGB LED with integrated controller
 K RGB LED NeoPixel addressable

TripwireHook.lib

@@ -1020,6 +1020,23 @@ X Vin 3 -350 -50 100 R 50 50 1 1 I
 ENDDRAW
 ENDDEF
 #
+# STI3408B
+#
+DEF STI3408B U 0 40 Y Y 1 F N
+F0 "U" 0 350 50 H V C CNN
+F1 "STI3408B" 0 250 50 H V C CNN
+F2 "Package_TO_SOT_SMD:SOT-23-5" 550 -250 50 H I C CNN
+F3 "" 550 -250 50 H I C CNN
+DRAW
+S -250 -200 250 200 1 1 0 f
+X EN 1 -350 -100 100 R 50 50 1 1 I
+X GND 2 0 -300 100 U 50 50 1 1 W
+X LX 3 350 100 100 L 50 50 1 1 B
+X Vin 4 -350 100 100 R 50 50 1 1 W
+X FB 5 350 -100 100 L 50 50 1 1 B
+ENDDRAW
+ENDDEF
+#
 # Spider
 #
 DEF Spider #G 0 40 Y Y 1 F N