The LTC3219 is a highly integrated multi-display LED driver. It uses a high-efficiency, low-noise charge pump to power nine general-purpose LED drivers and can set its maximum display current from an internal precision current reference. Each current source provides independent ramping, on/off, flicker, and grayscale adjustments, and is available through the I2C serial interface. Its LED current source has a 6-bit linear DAC for brightness adjustment control.
The LTC3219 can vary the boost ratio based on the voltage on the LED current source and by automatic or manual switching to optimize its efficiency. At startup, the boost ratio is 1X mode. When the effective current source approaches the Dropout state, the LTC3219 will automatically switch to the 1.5x boost mode first, and when the shutdown occurs again, it will switch to 2x. Boost mode. When new data is received from I2C, the LTC3219 is automatically reset to 1X mode. The figure below shows the structural block diagram of the LTC3219.
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