add LMR16030 buck converter

vreg/buck_lmr16030.yaml

@@ -0,0 +1,42 @@
+name: LMR16030
+variations: PDDAR, SDDAR
+# both variations have the same package
+description: voltage regulator, step-down
+datasheet: https://www.ti.com/lit/gpn/lmr16030
+
+pinout@PDDAR:
+  BOOT: 1
+  VIN: 2
+  EN: 3
+  RT/SYNC: 4
+  FB: 5
+  PGOOD: 6
+  GND: 7, 9
+  SW: 8
+
+pinout@SDDAR:
+  BOOT: 1
+  VIN: 2
+  EN: 3
+  RT/SYNC: 4
+  FB: 5
+  SS: 6
+  GND: 7, 9
+  SW: 8
+
+properties:
+  in: EN, RT/SYNC, FB
+  passive: BOOT, SS
+  out: PGOOD
+  power: VIN, SW
+  ground: GND
+
+schematic:
+  symbol: ic
+  left: EN, RT/SYNC, SS, PGOOD
+  right: BOOT,SW, FB
+  top: VIN
+  bottom: GND, PAD
+
+housing: # both variations have the same housing
+  outline: TI DDA-8