LT3756/LT3756-1/LT3756-2 - 100VIN, 100VOUT LED Controller
Features
- 3000:1 True Color PWM™ Dimming
- Wide Input Voltage Range: 6V to 100V
- Output Voltage Up to 100V
- Constant-Current and Constant-Voltage Regulation
- 100mV High Side Current Sense
- Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology
- Adjustable Frequency: 100kHz to 1MHz
- Open LED Protection
- Programmable Undervoltage Lockout with Hysteresis
- Improved Open LED Status Pin (LT3756-2)
- Frequency Synchronization (LT3756-1)
- PWM Disconnect Switch Driver
- CTRL Pin Provides Analog Dimming
- Low Shutdown Current: <1μA
- Programmable Soft-Start
- Thermally Enhanced 16-Lead QFN (3mm × 3mm) and MSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3756, LT3756-1 and LT3756-2 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7.15V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size.
The LT3756/LT3756-1/LT3756-2 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability.
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 |
|---|---|---|---|---|---|
| LT3756EMSE-1#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3756EMSE-1#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3756EMSE-2#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3756EMSE-2#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3756EMSE#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3756EMSE#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3756EUD-1#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3756EUD-1#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3756EUD-2#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3756EUD-2#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3756EUD#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3756EUD#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3756HMSE-2#PBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3756HMSE-2#TRPBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3756IMSE-1#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3756IMSE-1#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3756IMSE-2#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3756IMSE-2#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3756IMSE#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3756IMSE#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3756IUD-1#PBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LT3756IUD-1#TRPBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LT3756IUD-2#PBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LT3756IUD-2#TRPBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LT3756IUD#PBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LT3756IUD#TRPBF | 3x3 QFN-16 | UD | I | 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
sales office or authorized distributor.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 |
|---|---|---|---|
| DC1319B-A | LT3756EMSE-2 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 80V, VLED = 80V @ 0.5A | $210.00 | |
| DC1319B-B | LT3756EMSE-1 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 80V, VLED up to 80V @ 0.5A | $210.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT3756HMSE-2#PBF | MS-16E | H | $5.22 | $3.65 | Yes | |
| LT3756HMSE-2#TRPBF | MS-16E | H | $3.71 | Yes | ||
| LT3756IMSE-1#PBF | MS-16E | I | $4.86 | $3.40 | Yes | |
| LT3756IMSE-1#TRPBF | MS-16E | I | $3.46 | Yes | ||
| LT3756IMSE-2#PBF | MS-16E | I | $4.86 | $3.40 | Yes | |
| LT3756IMSE-2#TRPBF | MS-16E | I | $3.46 | Yes | ||
| LT3756IMSE#PBF | MS-16E | I | $4.86 | $3.40 | Yes | |
| LT3756IMSE#TRPBF | MS-16E | I | $3.46 | Yes | ||
| LT3756IUD-1#PBF | 3x3 QFN-16 | I | $4.71 | $3.30 | Yes | |
| LT3756IUD-1#TRPBF | 3x3 QFN-16 | I | $3.36 | Yes | ||
| LT3756IUD-2#PBF | 3x3 QFN-16 | I | $4.71 | $3.30 | Yes | |
| LT3756IUD-2#TRPBF | 3x3 QFN-16 | I | $3.36 | Yes | ||
| LT3756IUD#PBF | 3x3 QFN-16 | I | $4.71 | $3.30 | Yes | |
| LT3756IUD#TRPBF | 3x3 QFN-16 | I | $3.36 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- High Power LED Applications
- Current Limited Constant Voltage Applications
- Battery Charging
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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:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- LT3756 Demo Circuit - 100Vin 100Vout LED Driver Controller (8-80V to 24x 3.4V LEDs @ 500mA)
- LT3756-1 Demo Circuit - 100Vin 100Vout LED Driver Controller with Sync (8-80V to 24x 3.4V LEDs @ 500mA)
- LT3756-2 Demo Circuit - 30W White LED Automotive Headlamp Driver with Thermal Derating & Open LED Status (8-60V to 18x 3.4V LEDs @ 380mA)
- LT3756-2 Demo Circuit - Buck Mode 1A LED Driver with High Dimming Ratio and Open LED (24-80V to 1A/5 White LEDs)
- Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LT3756
LT3756-1
LT3756-2
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.
