NCP5030MTTXG

Buck−Boost Converter to Drive a Single LED from 1 Li−Ion or 3 Alkaline Batteries
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.
Features
• Efficiency: 87% at 500 mA and 3.3 V VIN
• Internal Synchronous Rectifier, No Schottky Diodes
• Adjustable Switching Limit Current to Optimize inductor size
• 0.3 A Shut−down Control with “True−Cut off”
• Input Voltage Range from 2.7 V to 5.5 V
• 200 mV Feedback Voltage
• Output Over−voltage and
Thermal Shut Down ProtectionTypical Applications
• Portable Flashlight / Torch Lights