LTC3210-2/LTC3210-3 - MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm × 3mm QFN
Features
- Low Noise Charge Pump Provides High Efficiency with Automatic Mode Switching
- Multimode Operation: 1x, 1.5x, 2x
- Individual Full-Scale Current Set Resistors
- Up to 500mA Total Output Current
- Single Wire EN/Brightness Control for MAIN and CAM LEDs
- 32:1 Linear Brightness Control Range for MAIN Display
- Three or Four 25mA Low Dropout MAIN LED Outputs
- One 400mA Low Dropout CAM LED Output
- Low Noise Constant Frequency Operation*
- Low Shutdown Current: 3μA
- Internal Soft-Start Limits Inrush Current During Startup and Mode Switching
- Open/Short LED Protection
- No Inductors
- 3mm × 3mm 16-Lead Plastic QFN Package
Typical Application
Description
The LTC3210-2/LTC3210-3 are low noise charge pump DC/DC converters designed to drive three or four MAIN LEDs and one high current CAM LED for camera lighting. The LTC3210-2/LTC3210-3 require only four small ceramic capacitors and two current set resistors to form a complete LED power supply and current controller.
Built-in soft-start circuitry prevents excessive inrush current during start-up and mode changes. High switching frequency enables the use of small external capacitors. Independent MAIN and CAM full-scale current settings are programmed by two external resistors.
Shutdown mode and current output levels are selected via two logic inputs. ENM and ENC are toggled to adjust the LED currents via internal counters and DACs. A 5-bit linear DAC (32 steps) provides high resolution brightness control for the MAIN display.
The 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 LTC3210-2/LTC3210-3 are available in a 3mm × 3mm 16-lead 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 |
|---|---|---|---|---|---|
| LTC3210EUD-2#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LTC3210EUD-2#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LTC3210EUD-3#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LTC3210EUD-3#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | 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 | |
|---|---|---|---|---|---|---|
| LTC3210EUD-2#PBF | 3x3 QFN-16 | E | $2.43 | $1.70 | Yes | |
| LTC3210EUD-2#TRPBF | 3x3 QFN-16 | E | $1.76 | Yes | ||
| LTC3210EUD-3#PBF | 3x3 QFN-16 | E | $2.43 | $1.70 | Yes | |
| LTC3210EUD-3#TRPBF | 3x3 QFN-16 | E | $1.76 | 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 |
|---|---|---|---|
| DC1071A-A | LTC3210EUD-2 Demo Board | Contact Factory | |
| DC1071A-B | LTC3210EUD-3 Demo Board | Contact Factory | |
| 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
- Multi-LED Light Supply for Cellphones/DSCs/PDAs
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Product Notifications
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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:
LTC3210
LTC3210-1
LTC3210-2
LTC3210-3
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.
