LM3644 Overview
The LM3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3644 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 dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2.
LM3644 Key Features
- 1 Dual Independent 1.5-A LED Current Source Programmability
- Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
- Torch Currents up to 360 mA (LM3644TT)
- Flash Timeout Values up to 1.6 seconds
- Optimized Flash LED Current During Low Battery
- > 85% Efficiency in Torch Mode (at 100 mA) and
- Grounded Cathode LED Operation for Improved
- Small Solution Size: < 16 mm2
- Hardware Strobe Enable (STROBE)
- Synchronization Input for RF Power Amplifier