In accordance with one embodiment of the present invention, a power semiconductor
device includes a first drift region of a first conductivity type extending over
a semiconductor substrate. The first drift region has a lower impurity concentration
than the semiconductor substrate. A second drift region of the first conductivity
type extends over the first drift region, and has a higher impurity concentration
than the first drift region. A plurality of stripe-shaped body regions of a second
conductivity type are formed in an upper portion of the second drift region. A
third region of the first conductivity type is formed in an upper portion of each
body region so as to form a channel region in each body region between the third
region and the second drift region. A gate electrode laterally extends over but
is insulated from: (i) the channel region in each body region, (ii) a surface area
of the second drift region between adjacent stripes of body regions, and (iii)
a surface portion of each source region.