NCP5030 pdf ,datasheet

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.