High Efficiency White LED Step-Up Converter With I²C Interface In 2mm X 2mm WLPThe MAX8831 integrates a 60mA, 28V PWM DC-DC Step-up converter with five low-dropout LED current Regulators for Display and keypad backlighting in cell phones, PDAs, and other portable devices. The IC provides up to 90% efficiency over the entire input voltage range of 2.7V to 5.5V. The Step-up converter operates at a fixed 2MHz switching frequency, enabling the use of very small external components to achieve a compact circuit area. For improved efficiency, the Step-up converter automatically transitions to pulse-skipping mode at light loads. By Maxim Integrated Products
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