LP5521 - National Semiconductor

LP5521 Programmable Three Channel LED Driver

The LP5521 is a three channel LED driver designed to produce variety of lighting effects for mobile devices. High efficiency charge pump enables LED driving over full Li-Ion battery voltage range. The device has a program memory for creating variety of lighting sequences. When program memory has been loaded, LP5521 can operate independently without processor.

Features

■ Adaptive charge pump with 1x and 1.5x gain provides up to 95% LED drive efficiency
■ Charge pump with soft start and overcurrent/short circuit
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■ protection Low input ripple and EMI Very small solution size, no inductor or resistors required 200 nA typical shutdown current Automatic power save mode I2C compatible interface Independently programmable constant current outputs with 8-bit current setting and 8-bit PWM control Typical LED output saturation voltage 50 mV and current matching 1% Three program execution engines with flexible instruction set Autonomous operat.