RT9278

® RT9278 High Efficiency Boost LDO Converter & High Power White LED Driver General Description Features The RT9278 is a compact, high efficiency, synchronous step-up converter, it provides a power supply solution for products powered by either two-cell, three-cell Alkaline/ NiMH or one-cell Li-Ion/Li-polymer battery. The RT9278 is boost converter with PWM control loop, provide up to 95% efficiency by using a synchronous rectifier. The maximum peak current in the internal switch is limited to up to 2A. It keeps the output voltage regulated when the input voltage exceeds the setting output voltage. The output voltage can be set by an external resister divider, or be fixed to reduce external components. It integrates a linear controller for linear regulator. RT9278 is available in VDFN-10L 3x3 package. Ordering Information RT9278 Package Type QV : VDFN-10L 3x3 (V-Type) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. 95% Efficiency Synchronous Boost Converter High Supply Capability 2A Current Limit Input Voltage Range : 1.5V to 5.5V 600kHz Fixed Switching Rate Adjustable Output Voltage Options Up to 5.5V Output Voltage Keep Regulated when Input Voltage Exceed Setting Output Voltage 1uA Supply Current in Shutdown Mode External Compensation Network Build in Linear Controller for ...