NCP5030 pdf ,datasheet

Buck?Boost Converter to Drive a Single LED from 1 Li?Ion or 3 Alkaline

The NCP5030 is a fixed frequency PWM buck?boost converter
optimized for constant current applications such as driving
high?powered white LED. The buck?boost is implemented in an
H?bridge topology and has an adaptive architecture where it operates
in one of three modes: boost, buck?boost, or buck depending on the
input and output voltage condition. This device has been designed
with high?efficiency for use in portable applications and is capable
of driving in DC up to 900 mA into a high power LED for flashlight /
torch applications. To protect the device cycle?by?cycle current
limiting and a thermal shutdown circuit have been incorporated as
well as output over?voltage protection. The 700 kHz switching
frequency allows the use of a low value 4.7 H and ceramic
capacitors. The NCP5030 is housed in a low profile space efficient
3x4 mm thermally enhanced WDFN.