LTC3205 - Multidisplay LED Controller

Features

  • Click Here For LTC3205 Evaluation Kits
  • Step-Up/Step-Down Fractional Charge Pump for Up to 92% Efficiency
  • Independent Current and Dimming Control for 1-4 LED Main, 1-2 LED Sub and RGB LED Displays
  • LED Currents Programmable Using 3-Wire Serial Interface
  • Up to 250mA of Continuous LED Current
  • 0.7% LED Current Matching
  • Low Noise Constant Frequency Operation*
  • Minimal Component Count
  • Automatic Soft-Start Limits Inrush Current
  • Four Programmable Dimming States for Main and Sub Displays
  • Up to 4096 Color Combinations for RGB Display
  • Low Shutdown Current: ICC < 1µA
  • Tiny 24-Lead (4mm x 4mm) QFN Package

Typical Application

LTC3205
LTC3205
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Description

The LTC3205 is a highly integrated multidisplay LED controller. The part contains a high efficiency, low noise fractional step-up/step-down charge pump to provide power for both main and sub white LED displays plus an RGB color LED display. The LTC3205 requires only four small ceramic capacitors plus two resistors to form a complete 3-display LED power supply and current controller.

Maximum currents for the main/sub and RGB displays are set independently with a single resistor. Current for each LED is controlled with an internal current source. Dimming and ON/OFF control for all displays are achieved via a 3-wire serial interface. Four dimming states exist for the main and sub displays and 16 dimming states are available via internal PWM for the red, green and blue LEDs resulting in up to 4096 color combinations.

The LTC3205 charge pump optimizes efficiency based on VIN and LED forward voltage conditions. The part powers up in step-down mode and automatically switches to stepup mode once any enabled LED current source begins to enter dropout. Internal circuitry prevents inrush current and excess input noise during start-up and mode switching.

The LTC3205 is available in a low profile 24-lead (4mm x 4mm x 0.8mm) QFN package.

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Packaging

QFN-24

LTC3205
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3205EUF QFN 24 E $3.00 $2.10 View
LTC3205EUF#PBF QFN 24 E $3.00 $2.10 View
LTC3205EUF#TR QFN 24 E   $2.20 View
LTC3205EUF#TRPBF QFN 24 E   $2.20 View
LTC3205XEUF QFN 24 E $2.19 $1.85 View
LTC3205XEUF#PBF QFN 24 E $2.19 $1.85 View
LTC3205XEUF#TR QFN 24 E   $1.95 View
LTC3205XEUF#TRPBF QFN 24 E   $1.95 View
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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.

Evaluation Kits

Part Number Description Price
DC629A LTC3205EUF | Multidisplay LED Controller (requires DC590 Controller) $125.00
DC590B none | USB Serial Controller $125.00
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Applications

  • Cellular Phones
  • Wireless PDAs
  • Multidisplay Handheld Devices
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Simulate

Linear Technology offers free software and demo boards that greatly simplify the task of testing and evaluating our LED drivers. To use these powerful tools with this product:

  • Download the QuickEval System software. The QuickEval System is a USB-based product demonstration and data acquisition system for use with Linear Technology’s A/D, D/A, LED drivers and Powered Ethernet Controllers. The software also includes web links to the appropriate device data sheets and provides an automatic update feature to keep the software current with the latest set of device drivers.

  • Request the DC590 USB Data Acquisition Controller either online or from your local sales representative. The DC590 interfaces with the USB port of your computer and connects to daughter cards for specific Linear Technology data converters.

  • Request the evaluation kit for the LTC3205 (DC629A) from your local sales representative. This daughter card interfaces with the DC590 and, along with the QuickEval software package, allows easy evaluation of the part from your PC.
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