LM3556
Overview
The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A.
- 1 Grounded Cathode LED Operation for Improved Thermal Management
- 1.5-A High-Side Current Source for Single LED
- Accurate and Programmable LED Current from
- 9 mA to 1.5 A
- > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
- Small Solution Size: < 20 mm2
- LED Thermal Sensing and Current Scale-Back
- Soft-Start Operation for Battery Protection
- Hardware Enable Pin
- Hardware Torch Enable
