LM3550
Overview
The LM3550 device is a low-noise, switchedcapacitor DC-DC converter designed to operate as a current-limited and adjustable (up to 5.3 V) supercapacitor charger. The LM3550 features userselectable termination voltages and provides one adjustable constant current output (up to 200 mA) and one NFET controller ideal for driving one or more high-current LEDs in a high-power flash mode or a low-power torch mode.
- 1 Up to 5 A Flash Current
- 4 Selectable Super-Capacitor Charge Voltage Levels (4.5 V, 5 V, 5.3 V, Optimized)
- Adjustable Torch Current (60 mA to 200 mA)
- Ambient Light or LED Thermal Sensing With Current Scaleback
- Dedicated Indicator LED Current Source
- No Inductor Required
- Programmable Flash Pulse Duration, and Torch and Flash Currents via I2C-Compatible Interface
- True Shutdown (LED Disconnect)
- Flash Timeout Protection
- Low Profile 20-Pin UQFN Package (3 mm × 2.5 mm × 0.8 mm)
