LTC3216

PRODUCTION

1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control

Part Models: 2
1ku List Price: Starting From $2.72

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Overview

High Efficiency Operation: 1x, 1.5x or 2x Boost Modes with Automatic Mode Switching
Ultralow Dropout I_LED Current Control
Output Current up to 1A
Low Noise Constant Frequency Operation
Independent Low Current/High Current Programming and Enable Pins
Wide V_IN Range: 2.9V to 4.4V
Open/Shorted LED Protection
LED Disconnect in Shutdown
Low Shutdown Current: 2.5µA
4% LED Current Programming Accuracy
Automatic Soft-Start Limits Inrush Current
No Inductors
Tiny Application Circuit (All Components <1mm Profile)
3mm x 4mm 12-Lead DFN Package

The LTC3216 is a low noise, high current charge pump DC/DC converter designed to power high current LEDs. The part includes an accurate programmable current source capable of driving loads up to 1A from a 2.9V to 4.4V input. Low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at V_IN and CPO) make the LTC3216 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. Independent high and low current settings are programmed by two external resistors. Shutdown mode and current output levels are selected via two logic inputs.

An ultralow dropout current source maintains accurate LED current at very low I_LED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when I_LED dropout is detected. The LTC3216 is available in a small 3mm x 4mm 12-Lead DFN package.

Applications

LED Torch/Camera Light Supply for Cell Phones, PDAs and Digital Cameras
Generic Lighting and/or Flash/Strobe Applications

Part Models: 2
1ku List Price: Starting From $2.72

Documentation

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
LTC3216EDE#PBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3216EDE#TRPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3216

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.