LTC3205 - Multidisplay LED Controller
Features
- 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
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.
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 |
|---|---|---|---|---|---|
| LTC3205EUF#PBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
| LTC3205EUF#TRPBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC3205EUF#PBF | 4x4 QFN-24 | E | $3.00 | $2.10 | Yes | |
| LTC3205EUF#TRPBF | 4x4 QFN-24 | E | $2.20 | Yes | ||
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC629A | LTC3205EUF | Multidisplay LED Controller (requires DC590 Controller) | $125.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 | |
| Buy Now | |||
Applications
- Cellular Phones
- Wireless PDAs
- Multidisplay Handheld Devices
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3205
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
