The LP8551 is a white
LED driver with integrated boost converter. It has four adjustable current sinks which can be
controlled by PWM input or with I2C-compatible serial
The boost converter has adaptive output voltage control based on the LED driver voltages.
This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in
LED outputs have 8-bit current resolution and up to 13-bit PWM resolution to achieve
smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs
to reduce peak current from the boost converter, thus making the boost capacitors smaller. The
Phase Shifting scheme also eliminates audible noise.
Internal EEPROM is used for storing the configuration data. This makes it possible to
have minimum external component count and make the solution very small.
The LP8551 has safety
features which make it possible to detect LED outputs with open or short fault. As well, low input
voltage and boost overcurrent conditions are monitored, and chip is turned off in case of these
events. Thermal de-rating function prevents overheating of the device by reducing backlight
brightness when set temperature has been reached.
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