DC1039A-A: 600mA @ 6V Max, 2.9 ~ 5.5Vin, Charge Pump

Demonstration circuit 1039 is a 600mA Universal Multi-Output LED/CAM Driver with six white LEDs, two RGB LEDs, and a camera flash featuring the LTC3207/LTC3207-1.

The LTC3207/LTC3207-1 is a low noise charge pump designed to drive 12 universal LED (ULED) current sources and one high current camera flash. The LTC3207/LTC3207-1 requires only five small ceramic capacitors to form a complete LED power supply and current controller.

The maximum display currents are set with an internal precision current reference. On/Off blinking, gradation, and intensity are achieved via an I2C serial interface. See the LTC3207/LTC3207-1 data sheet for more information on this process. There are 64 dimming states available for the universal LEDs and 16 dimming states for the camera LED.

The charge pump optimizes efficiency based on the volt-age across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to drop out. The first dropout switches the part to 1.5x mode and a subsequent dropout switches the part into 2x mode. The part resets to 1x mode whenever a data byte is up-dated via the I2C port.