LTC3220/LTC3220-1 - 360mA Universal 18-Channel LED Driver

Features

  • Eighteen 20mA Universal Current Sources with 64-Step Linear Brightness Control
  • Independent On/Off, Brightness Level, Blinking and Gradation Control for Each Current Source Using 2-Wire I2C Interface
  • Low Noise Multi-Mode Charge Pump (1x, 1.5x, 2x) Provides Up to 91% Efficiency
  • Slew Limited Switching Reduces Conducted and Radiated Noise (EMI)
  • Up to 360mA Total Output Current
  • Internal Current Reference
  • Single Reset Pin for Asynchronous Shutdown and Reset of All Data Registers
  • Two I2C Addresses Are Available (LTC3220: 0011100, LTC3220-1: 0011101)
  • Automatic or Forced Mode Switching
  • Internal Soft-Start Limits Inrush Current
  • Short-Circuit/Thermal Protection
  • 4mm × 4mm Ultrathin (0.55mm) 28-Lead QFN Package

Typical Application

LTC3220 Typical Application

Description

The LTC3220/LTC3220-1 are highly integrated multi-display LED drivers. These parts contain a high efficiency, low noise charge pump to provide power to up to eighteen universal LED current sources. The LTC3220/LTC3220-1 require only five small ceramic capacitors to form a complete LED power supply and current controller.

The LED currents are set by an internal precision current reference. Independent dimming, on/off, blinking and gradation control for all universal current sources is achieved via the I2C serial interface. 6-bit linear DACs are available to adjust brightness levels independently for each universal LED current source.

The LTC3220/LTC3220-1 charge pump optimizes efficiency based on the voltage across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The first dropout switches the parts into 1.5x mode and a subsequent dropout switches the LTC3220/LTC3220-1 into 2x mode. The parts reset to 1x mode whenever a data bit is updated via the I2C port.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3220EPF-1#PBF 4x4 UTQFN-28 PF E 05-08-1759 Yes
LTC3220EPF-1#TRPBF 4x4 UTQFN-28 PF E 05-08-1759 Yes
LTC3220EPF#PBF 4x4 UTQFN-28 PF E 05-08-1759 Yes
LTC3220EPF#TRPBF 4x4 UTQFN-28 PF E 05-08-1759 Yes
LTC3220IPF-1#PBF 4x4 UTQFN-28 PF I 05-08-1759 Yes
LTC3220IPF-1#TRPBF 4x4 UTQFN-28 PF I 05-08-1759 Yes
LTC3220IPF#PBF 4x4 UTQFN-28 PF I 05-08-1759 Yes
LTC3220IPF#TRPBF 4x4 UTQFN-28 PF I 05-08-1759 Yes


LTC3220 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • 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 Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3220EPF-1#PBF 4x4 UTQFN-28 E $3.36 $2.35 Yes
LTC3220EPF-1#TRPBF 4x4 UTQFN-28 E $2.41 Yes
LTC3220EPF#PBF 4x4 UTQFN-28 E $3.36 $2.35 Yes
LTC3220EPF#TRPBF 4x4 UTQFN-28 E $2.41 Yes
LTC3220IPF-1#PBF 4x4 UTQFN-28 I $3.86 $2.70 Yes
LTC3220IPF-1#TRPBF 4x4 UTQFN-28 I $2.76 Yes
LTC3220IPF#PBF 4x4 UTQFN-28 I $3.86 $2.70 Yes
LTC3220IPF#TRPBF 4x4 UTQFN-28 I $2.76 Yes
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* 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.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1265A-A LTC3220EPF Demo Board | 18-LED Boost Charge Pump LED Driver, 2.9V ≤ VIN ≤ 5.5V, VLED up to 5V @ 20mA per LED (DC590 req) $125.00
DC1265A-B LTC3220EPF-1 | 360mA general purpose LED driver (req. DC590) $125.00
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Companion Boards

Part Number Description Price Documentation
DC590B Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards $50.00
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Click here to view our complete list of demo boards

Applications

  • Video Phones with QVGA+ Displays
  • Keypad Lighting
  • General/Miscellaneous Lighting

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support