LT3591 - White LED Driver with Integrated Schottky in 3mm x 2mm DFN
Features
- Drives Up to Ten White LEDs from a 3V Supply
- High Side Sense Allows “One Wire Current Source”
- Internal Schottky Diode
- One Pin Dimming and Shutdown
- 80:1 True Color PWMTM Dimming Range
- 42V Open LED Protection
- 1MHz Switching Frequency
- ±5% Reference Accuracy
- VIN Range: 2.5V to 12V
- Requires Only 2.2µF Output Capacitor
- Low Profile 8-Lead DFN Package
- (3mm × 2mm × 0.75mm)
Typical Application
Description
The LT3591 is a fixed frequency step-up DC/DC converter specifi cally designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source;” one side of the LED string can be returned to ground anywhere, allowing a simpler one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.
The high switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. Few external components are needed: open-LED protection and the Schottky diode are all contained inside a low profi le 3mm × 2mm 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 |
|---|---|---|---|---|---|
| LT3591EDDB#PBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3591EDDB#TRMPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3591EDDB#TRPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | 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 | |
|---|---|---|---|---|---|---|
| LT3591EDDB#PBF | 3x2 DFN-8 | E | $2.00 | Yes | ||
| LT3591EDDB#TRMPBF | 3x2 DFN-8 | E | $2.00 | $1.45 | Yes | |
| LT3591EDDB#TRPBF | 3x2 DFN-8 | E | $2.00 | $1.40 | 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 |
|---|---|---|---|
| DC1124A | LT3591EDDB Demo Board | Boost LED Driver, 3V ≤ VIN ≤ 9V, VOUT = 40V @ 20mA | $75.00 | |
| Buy Now | |||
Applications
- Tape and Reel: Add #TR
- Lead Free: Add #PBF
- Lead Free Tape and Reel: Add #TRPBF
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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
To launch a ready to run LTspice demonstration circuit for this part:
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Models for the following parts are available in LTspice:
LT3591
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.
