LT3517 - Full-Featured LED Driver with 1.5A Switch Current
Features
- 5000:1 True Color PWM™ Dimming Ratio
- 1.5A, 45V Internal Switch
- 100mV High Side Current Sense
- Open LED Protection
- Adjustable Frequency: 250kHz to 2.5MHz
- Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V - Operates in Boost, Buck Mode and Buck-Boost Mode
- Gate Driver for PMOS LED Disconnect
- Constant-Current and Constant-Voltage Regulation
- CTRL Pin Provides 10:1 Analog Dimming
- Low Shutdown Current: <1μA
- Available in (4mm × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3517 is a current mode DC/DC converter with an internal 1.5A, 45V switch specifically designed to drive LEDs. The LT3517 operates as a LED driver in boost, buck mode and buck-boost mode. It combines a traditional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. Programmable switching frequency allows optimization of the external components for efficiency or component size. The switching frequency of LT3517 can be synchronized to an external clock signal. The LED current is externally programmable with a 100mV sense resistor. The external PWM input provides up to 5000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio.
The LT3517 is available in the tiny footprint 16-lead QFN (4mm × 4mm) and the 16-pin TSSOP packages. The LT3517 provides a complete solution for both constant-voltage and constant-current applications.
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 |
|---|---|---|---|---|---|
| LT3517EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BA) | Yes |
| LT3517EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BA) | Yes |
| LT3517EUF#PBF | 4x4 QFN-16 | UF | E | 05-08-1692 | Yes |
| LT3517EUF#TRPBF | 4x4 QFN-16 | UF | E | 05-08-1692 | Yes |
| LT3517HFE#PBF | TSSOP-16 | FE | H | 05-08-1663 (BA) | Yes |
| LT3517HFE#TRPBF | TSSOP-16 | FE | H | 05-08-1663 (BA) | Yes |
| LT3517HUF#PBF | 4x4 QFN-16 | UF | H | 05-08-1692 | Yes |
| LT3517HUF#TRPBF | 4x4 QFN-16 | UF | H | 05-08-1692 | Yes |
| LT3517IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BA) | Yes |
| LT3517IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BA) | Yes |
| LT3517IUF#PBF | 4x4 QFN-16 | UF | I | 05-08-1692 | Yes |
| LT3517IUF#TRPBF | 4x4 QFN-16 | UF | I | 05-08-1692 | 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 | |
|---|---|---|---|---|---|---|
| LT3517EFE#PBF | TSSOP-16 | E | $4.07 | $2.85 | Yes | |
| LT3517EFE#TRPBF | TSSOP-16 | E | $2.91 | Yes | ||
| LT3517EUF#PBF | 4x4 QFN-16 | E | $3.86 | $2.70 | Yes | |
| LT3517EUF#TRPBF | 4x4 QFN-16 | E | $2.76 | Yes | ||
| LT3517HFE#PBF | TSSOP-16 | H | $5.24 | $3.67 | Yes | |
| LT3517HFE#TRPBF | TSSOP-16 | H | $3.73 | Yes | ||
| LT3517HUF#PBF | 4x4 QFN-16 | H | $4.99 | $3.49 | Yes | |
| LT3517HUF#TRPBF | 4x4 QFN-16 | H | $3.55 | Yes | ||
| LT3517IFE#PBF | TSSOP-16 | I | $4.89 | $3.42 | Yes | |
| LT3517IFE#TRPBF | TSSOP-16 | I | $3.48 | Yes | ||
| LT3517IUF#PBF | 4x4 QFN-16 | I | $4.63 | $3.24 | Yes | |
| LT3517IUF#TRPBF | 4x4 QFN-16 | I | $3.30 | 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 |
|---|---|---|---|
| DC1279A | LT3517EUF | Boost LED Driver, 3V ≤ PVIN ≤ 40V, VLED up to 40V @ 330mA | $100.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3517HFE#PBF | TSSOP-16 | H | $5.24 | $3.67 | Yes | |
| LT3517HFE#TRPBF | TSSOP-16 | H | $3.73 | Yes | ||
| LT3517HUF#PBF | 4x4 QFN-16 | H | $4.99 | $3.49 | Yes | |
| LT3517HUF#TRPBF | 4x4 QFN-16 | H | $3.55 | Yes | ||
| LT3517IFE#PBF | TSSOP-16 | I | $4.89 | $3.42 | Yes | |
| LT3517IFE#TRPBF | TSSOP-16 | I | $3.48 | Yes | ||
| LT3517IUF#PBF | 4x4 QFN-16 | I | $4.63 | $3.24 | Yes | |
| LT3517IUF#TRPBF | 4x4 QFN-16 | I | $3.30 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Display Backlighting
- Automotive and Avionic Lighting
- Illumination
- Scanners
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Design Tools
LTspice
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LT3517
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.
