AL3644DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVERDescriptionFeatures The AL3644 is a dual LED flash driver that provides a high level of Dual Independent 1.5A LED Current Source Programmability adjustability within a small solution size. The AL3644 utilizes a 2MHz Accurate and Programmable LED Current Range from 1.4mA to or 4MHz fixed frequency synchronous boost converter to provide 1.5A power to the dual 1.5A constant current LED sources. The dual 128 Torch Currents up to 360mA (AL3644TT) level current sources provide the flexibility to adjust the current ratios Flash Timeout Values up to 1.6 seconds (AL3644TT) between LED1 and LED2. An adaptive regulation method ensures the Optimized Flash LED Current During Low Battery Conditions
current sources remain in regulation and maximizes efficiency. (Input Voltage Flash Monitor) T > 85% Efficiency in Torch Mode (at 100mA) and Flash Mode (at C Features of the AL3644 are controlled via an I2C-compatible 1A to 1.5A) U interface. These features include: hardware flash and hardware torch Grounded Cathode LED Operation for Improved Thermal D pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC Management O thermistor monitor. The device offers independently programmable Small Solution Size: < 16mm2 R P currents in each output leg to drive the LEDs in a Flash or Movie Hardware Strobe Enable (STROBE)