LT3756/LT3756-1/LT3756-2 - 100VIN, 100VOUT LED Controller
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.
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
Typical Application
 | Applications- High Power LED Applications
- Current Limited Constant Voltage Applications
- Battery Charging
Packaging
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Order Information| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|
| LT3756EMSE-1#PBF | MS-16E | E | $4.29 | $3.00 |
| LT3756EMSE-1#TRPBF | MS-16E | E | | $3.06 |
| LT3756EMSE-2#PBF | MS-16E | E | $4.29 | $3.00 |
| LT3756EMSE-2#TRPBF | MS-16E | E | | $3.06 |
| LT3756EMSE#PBF | MS-16E | E | $4.29 | $3.00 |
| LT3756EMSE#TRPBF | MS-16E | E | | $3.06 |
| LT3756EUD-1#PBF | 3x3 QFN-16 | E | $4.14 | $2.90 |
| LT3756EUD-1#TRPBF | 3x3 QFN-16 | E | | $2.96 |
| LT3756EUD-2#PBF | 3x3 QFN-16 | E | $4.14 | $2.90 |
| LT3756EUD-2#TRPBF | 3x3 QFN-16 | E | | $2.96 |
| LT3756EUD#PBF | 3x3 QFN-16 | E | $4.14 | $2.90 |
| LT3756EUD#TRPBF | 3x3 QFN-16 | E | | $2.96 |
| LT3756HMSE-2#PBF | MS-16E | H | $5.22 | $3.65 |
| LT3756HMSE-2#TRPBF | MS-16E | H | | $3.71 |
| LT3756IMSE-1#PBF | MS-16E | I | $4.86 | $3.40 |
| LT3756IMSE-1#TRPBF | MS-16E | I | | $3.46 |
| LT3756IMSE-2#PBF | MS-16E | I | $4.86 | $3.40 |
| LT3756IMSE-2#TRPBF | MS-16E | I | | $3.46 |
| LT3756IMSE#PBF | MS-16E | I | $4.86 | $3.40 |
| LT3756IMSE#TRPBF | MS-16E | I | | $3.46 |
| LT3756IUD-1#PBF | 3x3 QFN-16 | I | $4.71 | $3.30 |
| LT3756IUD-1#TRPBF | 3x3 QFN-16 | I | | $3.36 |
| LT3756IUD-2#PBF | 3x3 QFN-16 | I | $4.71 | $3.30 |
| LT3756IUD-2#TRPBF | 3x3 QFN-16 | I | | $3.36 |
| LT3756IUD#PBF | 3x3 QFN-16 | I | $4.71 | $3.30 |
| LT3756IUD#TRPBF | 3x3 QFN-16 | I | | $3.36 |
Demo Boards
| Part Number | Description | Price |
|---|
| 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 |
DatasheetDesign NoteReliability DataLT JournalPress ReleaseCAD SymbolLTspice | Related Products |
