LM3646 Description
The LM3646 utilizes a 4-MHz fixed-frequency synchronous boost converter to provide power to dual 1.5-A constant current LED sources. The high-side current sources allow for grounded cathode LED operation providing flash current up to 1.5 A total. An adaptive headroom regulation scheme ensures the LED currents remain in regulation and maximizes efficiency.
LM3646 Key Features
- 1 High-Side Current Sources Allowing for Grounded LED Cathode for Improved Thermal Management
- > 85% Efficiency in Torch and Flash Modes
- Small Solution Size < 20 mm2
- Accurate and Programmable Flash LED Current
- Accurate and Programmable Torch LED Current
- Dual 1.5-A High-Side Current Sources for Dual
- Hardware Flash and Torch Enables
- Hardware Enable Pin
- Soft-Start Operation for Battery Protection
- LED Thermal Sensing and Current Scale-Back