LTC3218
LTC3218
PRODUCTION400mA Single Wire Camera LED Charge Pump
- Part Models
- 2
- 1ku List Price
- Starting From $2.45
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Overview
- 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)
The LTC3218 is a low-noise, high-current charge pump DC/DC converter capable of driving high current LEDs at up to 400mA from a 2.9V to 4.5V input. A low external parts count (one flying capacitor, two programming resistors and two bypass capacitors at VIN and CPO) make the LTC3218 ideally suited for small, battery-powered applications.
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.
Applications
- LED Torch/Flash Supply for DSCs/Cellphones
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3218EDDB#TRMPBF | 10-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3218EDDB#TRPBF | 10-Lead DFN (3mm x 2mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LTC3218
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LTC3218EDDB Demo Board | Boost Charge Pump Camera LED Driver, 2.9V ≤ VIN ≤ 4.5V, VLED up to 4.5V @ 400mA
Resources
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