LTC3219EUD#PBF

LINEAR TECHNOLOGY  LTC3219EUD#PBF  芯片, 发光二极管驱动器, 250mA, 通用型, 20QFN

The is a highly integrated multi-display LED Driver contains a high efficiency, low noise charge pump to provide power to nine universal LED current sources. The LTC3219 requires only five small ceramic capacitors to form a complete LED power supply and current controller. The maximum display currents are set by an internal precision current reference. Independent dimming, ON/OFF, blinking and gradation control for all current sources is achieved via the I²C serial interface. 6-bit linear DACs are available for adjusting brightness levels for each universal LED current source. The LTC3219 charge pump optimizes efficiency based on the voltage across the LED current sources. The device powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The first dropout switches the IC into 1.5x mode and a subsequent dropout switches the LTC3219 into 2x mode.

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Multimode charge pump provides up to 91% efficiency

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Slew limited switching reduces conducted and radiated noise EMI

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Internal current reference

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Configurable ENU pin for asynchronous LED ON/OFF control

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Automatic or forced mode switching

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Internal soft-start limits inrush current

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Short-circuit/thermal protection

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Nine 28mA universal current sources with 64-step linear brightness control