LM3554 Description
The LM3554 is a 2-MHz fixed-frequency, currentmode synchronous boost converter. The device is designed to operate as a dual 600-mA (1.2 A total) constant-current driver for high-current white LEDs, or as a regulated 4.5-V or 5-V voltage source.
LM3554 Key Features
- 1 Input Voltage: 2.5 V to 5.5 V
- Programmable 4.5-V or 5-V Constant Output
- Dual High-Side Current Sources
- Grounded Cathode Allowing for Better Heat
- > 90% Efficiency
- Ultra-Small Solution Size: < 23 mm2
- Four Operating Modes: Torch, Flash, LED
- Accurate and Programmable LED Current from
- Hardware Flash and Torch Enable
- LED Thermal Sensing and Current Scaleback