LTC3216 - 1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control

Features

• Click Here For LTC3216 Evaluation Kits
• High Efficiency Operation: 1x, 1.5x or 2x Boost Modes with Automatic Mode Switching
• Ultralow Dropout ILED 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: 2.5mA
• 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

Typical Application

Description

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

Packaging

DFN-12

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTC3216EDE	DFN	12	E	$2.38	$2.00	View
LTC3216EDE#PBF	DFN	12	E	$2.38	$2.00	View
LTC3216EDE#TR	DFN	12	E		$2.10	View
LTC3216EDE#TRPBF	DFN	12	E		$2.10	View
Buy Now
Request Samples

^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number	Description	Price
DC805A	LTC3216EDE | Low Noise High Current LED Charge Pump	$100.00
Buy Now

Applications

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

Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.