LM3551 Description
The LM3551 and LM3552 are fixed frequency, current mode step-up DC/DC converters with two integrated NFETs that can be used for precision LED brightness control. The devices are capable of driving loads up to 1A from a single-cell Li-Ion battery. The LM3551 and LM3552 can drive one or more high current flash LEDs either in a high power Flash mode or a lower power Torch mode using the TORCH/FLASH pin.
LM3551 Key Features
- 2 Up to 1A Total Drive Current
- Flash Timeout Protection
- Independent Torch/Flash/Shutdown Modes
- LED Disconnect in Shutdown
- Programmable Soft-Start Limits Inrush Current
- Over-Voltage Protection
- Wide Voltage Range 2.7 to 5.5V
- 1.25MHz Constant Switching Frequency
- Small, Low Profile Package, Non-Pullback