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CM4072 Low Noise Charge Pump/Linear Regulator LED Driver
The CM4072 Low-noise Charge Pump / LDO Regulator is designed to power white backlight LEDs used in main displays or camera flash LEDs in wireless handsets. The 5V output provides up to 100mA continuous current for input voltages from 3.0V to 5.5V, and up to 200mA for a narrower range. This is accomplished with an integrated charge pump that boosts the input voltage before feeding it to an internal LDO linear regulator. The CM4072 operates with excellent power supply ripple rejection while maintaining good power efficiency. The device utilizes two external capacitors and operates at 250kHz. Separate analog and digital ground pins are provided for the charge pump and the rest of the circuitry to eliminate ground noise feed-through from the charge pump to the regulated output.
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