ST1S10 synchronus DC-DC conveter

On-line simulator

Datasheets:

ST1S10 datasheet including layout design Application note: 3A step-down synchronus converter based on ST1S10

Recomended passive components:

SMD ceramic capacitors from SAMWHA SMD resistors from ROYALOHM (general purpose) SMD resistors from ROYALOHM (precision)
Inductors: http://www.core.com.tw/product_list.asp?kid=3