What are some of the currently available Charge Pump ICs?
High Efficiency, Negative-Charge-Pump White-LED Maxims MAX8822 is a white-LED (WLED) driver that combines a highly efficient negative charge pump with two independent, low-dropout (LDO) regulators (Figure 2). It can drive up to four white light-emitting diodes (LEDs) with regulated constant current for display backlighting in cell phones, digital cameras, PDAs, and other handheld devices. By utilizing a proprietary negative 0.5x inverting charge pump and independent low-dropout (LDO) adaptive current regulators, very high efficiency is achieved over the full one-cell Li+ battery voltage range, even with large LED VF mismatch. Its 1MHz fixed-frequency switching allows small external components. The regulation scheme is optimized to ensure low EMI and low input ripple. Two 200mA, low-noise, high power-supply-rejection-ratio (PSRR) LDOs with programmable output voltages provide power for battery-based devices. The LDO regulators produce a low 45VRMS noise and high 60dB PSRR output for noi
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