LTC3216 - 1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control
Features
- 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 VIN 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 VIN 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
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 |
|---|---|---|---|---|---|
| LTC3216EDE#PBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | Yes |
| LTC3216EDE#TRPBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | 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 | |
|---|---|---|---|---|---|---|
| LTC3216EDE#PBF | 4x3 DFN-12 | E | $2.38 | $2.00 | Yes | |
| LTC3216EDE#TRPBF | 4x3 DFN-12 | E | $2.10 | 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 |
|---|---|---|---|
| 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
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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:
LTC3216
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.
