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LTC3218 - 400mA Single Wire Camera LED Charge Pump

Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. A built-in 2-second timer protects the LED during flash mode.

Output current level is programmed by an external resistor. LED current is regulated using an internal high side 220mΩ sense resistor. Automatic mode switching optimizes efficiency by monitoring the voltage across the charge pump and switching modes only when dropout is detected. The part is available in a low profile 3mm × 2mm 10-lead DFN package.

Features Low Noise Constant-Frequency Operation Multi-Mode Operation: 1x or 2x Boost Mode Automatic Mode Switching High Output Current: 150mA (Continuous), 400mA (Pulsed) From Li-Ion/Polymer Input 2-Second Flash Current Timeout for LED Protection Automatic Soft-Start Output Disconnect No Inductors 220mΩ Internal High Side Current Sense Resistor Single Resistor Programming Capability Tiny Application Circuit (3mm × 2mm DFN Package, All Components < 1mm High) Typical Application

Applications LED Torch/Flash Supply for DSCs/Cellphones Packaging

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