NCP5030 pdf ,datasheetBuck−Boost Converter to Drive a Single LED from 1 Li−Ion or 3 AlkalineThe NCP5030 is a fixed frequency PWM buck−boost converteroptimized for constant current applications such as drivinghigh−powered white LED. The buck−boost is implemented in anH−bridge topology and has an adaptive architecture where it operatesin one of three modes: boost, buck−boost, or buck depending on theinput and output voltage condition. This device has been designedwith high−efficiency for use in portable applications and is capableof driving in DC up to 900 mA into a high power LED for flashlight /torch applications. To protect the device cycle−by−cycle currentlimiting and a thermal shutdown circuit have been incorporated aswell as output over−voltage protection. The 700 kHz switchingfrequency allows the use of a low value 4.7 H and ceramiccapacitors. The NCP5030 is housed in a low profile space efficient3x4 mm thermally enhanced WDFN.
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