diff --git a/README.MD b/README.MD
index 82df89b..4141df8 100644
--- a/README.MD
+++ b/README.MD
@@ -15,9 +15,11 @@ Libraries for KiCad.
 
 ## Power
 * MCP73833
+* ST1S10
 
 ## STM32F4
 * STM32F407VGT
+* STM32F407ZGT
 
 ## Connectors
 * Micro SD Card
diff --git a/schematics/power/regulators.dcm b/schematics/power/regulators.dcm
index 3a1a3c0..ab4c9d2 100644
--- a/schematics/power/regulators.dcm
+++ b/schematics/power/regulators.dcm
@@ -6,4 +6,10 @@ K Buck Step-down regulator
 F http://www.ti.com/lit/ds/symlink/lm2596.pdf
 $ENDCMP
 #
+$CMP ST1S10
+D 3 A, 900 kHz, monolithic synchronous step-down regulator IC
+K Step Down Switch Mode Power Supply SMPS
+F http://www.st.com/content/ccc/resource/technical/document/datasheet/fb/03/25/5a/eb/45/46/33/CD00169322.pdf/files/CD00169322.pdf/jcr:content/translations/en.CD00169322.pdf
+$ENDCMP
+#
 #End Doc Library
diff --git a/schematics/power/regulators.lib b/schematics/power/regulators.lib
index e5bee87..88aca8d 100644
--- a/schematics/power/regulators.lib
+++ b/schematics/power/regulators.lib
@@ -22,4 +22,27 @@ X ON 5 -150 -500 200 U 50 50 1 1 I I
 ENDDRAW
 ENDDEF
 #
+# ST1S10
+#
+DEF ST1S10 U 0 40 Y Y 1 F N
+F0 "U" 50 50 60 H V C CNN
+F1 "ST1S10" 500 50 60 H V C CNN
+F2 "" 0 0 60 H I C CNN
+F3 "" 0 0 60 H I C CNN
+$FPLIST
+ PowerSO-8
+$ENDFPLIST
+DRAW
+S 0 0 650 -700 0 1 0 f
+X V_IN_A 1 -200 -200 200 R 50 50 1 1 W
+X EN_L 2 -200 -400 200 R 50 50 1 1 I I
+X V_FB 3 850 -400 200 L 50 50 1 1 I
+X AGND 4 300 -900 200 U 50 50 1 1 W
+X SYNC 5 450 -900 200 U 50 50 1 1 I
+X V_IN_SW 6 -200 -100 200 R 50 50 1 1 W
+X SW 7 850 -100 200 L 50 50 1 1 w
+X PGND 8 150 -900 200 U 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
 #End Library