LM3643 Description
The LM3643 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3643 utilizes a 2-MHz or 4-MHz fixedfrequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources. The total LED current the LM3643 boost can deliver is 1.5 A (ILED1 + ILED2.
LM3643 Key Features
- 1 1.5 A Total Allowed LED Current During Operation (ILED1 + ILED2 = 1.5 A)
- Dual Independent LED Current Source Programmability
- Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
- Optimized Flash LED Current During Low Battery Conditions (IVFM)
- > 85% Efficiency in Torch Mode (@ 100 mA) and Flash Mode (@1 A to 1.5 A)
- Grounded Cathode LED Operation for Improved Thermal Management
- Small Solution Size: < 16 mm2
- Hardware Strobe Enable (STROBE)
- Synchronization Input for RF Power Amplifier
- Hardware Torch Enable (TORCH/TEMP)