LT3796/LT3796-1 - 100V Constant-Current and Constant-Voltage Controller with Dual Current Sense
Features
- 3000:1 True Color PWM™ Dimming
- Wide Input Voltage Range: 6V to 100V
- Current Monitoring Up to 100V
- High Side PMOS Disconnect and PWM Switch Driver
- Constant-Current and Constant-Voltage Regulation
- Dual Current Sense Amplifiers with Reporting
- C/10 Detection for Battery and SuperCap Charging
- Linear Current Sense Threshold Programming
- Short-Circuit Protection
- Adjustable Frequency: 100kHz to 1MHz
- Frequency Synchronization (LT3796)
- Independent Top Gate Enable Pin (LT3796-1)
- Programmable Open LED Protection with VMODE Flag
- Programmable Undervoltage Lockout with Hysteresis
- Soft-Start with Programmable Fault Restart Timer
- Available in 28-Lead TSSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT®3796/LT3796-1 are DC/DC controllers designed to regulate a constant-current or constant-voltage and are ideal for driving LEDs. The fixed frequency and current mode architecture result in stable operation over a wide range of supply and output voltages. Two ground referred voltage FB pins serve as the input for several LED protection features, and also allow the converter to operate as a constant-voltage source. The LT3796/LT3796-1 feature a programmable threshold output current sense amplifier with rail-to-rail common mode range. A separate high side amplifier is gain configurable with two resistors and can be used to regulate a second current or a voltage in combination with one of the FB pins. The PWM input provides LED dimming ratios of up to 3000:1.
The LT3796-1 is optimized for a second output current regulation loop that can be enabled/disabled with a PMOS switch, either to drive a second LED string or to extend analog dimming range.
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 |
|---|---|---|---|---|---|
| LT3796EFE-1#PBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LT3796EFE-1#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LT3796EFE#PBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LT3796EFE#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LT3796HFE-1#PBF | TSSOP-28 | FE | H | 05-08-1663 (EB) | Yes |
| LT3796HFE-1#TRPBF | TSSOP-28 | FE | H | 05-08-1663 (EB) | Yes |
| LT3796HFE#PBF | TSSOP-28 | FE | H | 05-08-1663 (EB) | Yes |
| LT3796HFE#TRPBF | TSSOP-28 | FE | H | 05-08-1663 (EB) | Yes |
| LT3796IFE-1#PBF | TSSOP-28 | FE | I | 05-08-1663 (EB) | Yes |
| LT3796IFE-1#TRPBF | TSSOP-28 | FE | I | 05-08-1663 (EB) | Yes |
| LT3796IFE#PBF | TSSOP-28 | FE | I | 05-08-1663 (EB) | Yes |
| LT3796IFE#TRPBF | TSSOP-28 | FE | I | 05-08-1663 (EB) | 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 | |
|---|---|---|---|---|---|---|
| LT3796EFE-1#PBF | TSSOP-28 | E | $4.93 | $3.45 | Yes | |
| LT3796EFE-1#TRPBF | TSSOP-28 | E | $3.51 | Yes | ||
| LT3796EFE#PBF | TSSOP-28 | E | $4.93 | $3.45 | Yes | |
| LT3796EFE#TRPBF | TSSOP-28 | E | $3.51 | Yes | ||
| LT3796HFE-1#PBF | TSSOP-28 | H | $5.87 | $4.11 | Yes | |
| LT3796HFE-1#TRPBF | TSSOP-28 | H | $4.17 | Yes | ||
| LT3796HFE#PBF | TSSOP-28 | H | $5.87 | $4.11 | Yes | |
| LT3796HFE#TRPBF | TSSOP-28 | H | $4.17 | Yes | ||
| LT3796IFE-1#PBF | TSSOP-28 | I | $5.51 | $3.86 | Yes | |
| LT3796IFE-1#TRPBF | TSSOP-28 | I | $3.92 | Yes | ||
| LT3796IFE#PBF | TSSOP-28 | I | $5.51 | $3.86 | Yes | |
| LT3796IFE#TRPBF | TSSOP-28 | I | $3.92 | 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 |
|---|---|---|---|
| DC1706A | LT3796EFE Demo Board I 100V LED Controller with Current Monitor; 8V to 85VIN, up to 85VOUT@0.4A | $200.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT3796HFE-1#PBF | TSSOP-28 | H | $5.87 | $4.11 | Yes | |
| LT3796HFE-1#TRPBF | TSSOP-28 | H | $4.17 | Yes | ||
| LT3796HFE#PBF | TSSOP-28 | H | $5.87 | $4.11 | Yes | |
| LT3796HFE#TRPBF | TSSOP-28 | H | $4.17 | Yes | ||
| LT3796IFE-1#PBF | TSSOP-28 | I | $5.51 | $3.86 | Yes | |
| LT3796IFE-1#TRPBF | TSSOP-28 | I | $3.92 | Yes | ||
| LT3796IFE#PBF | TSSOP-28 | I | $5.51 | $3.86 | Yes | |
| LT3796IFE#TRPBF | TSSOP-28 | I | $3.92 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- High Power LED, High Voltage LED, Dual String
- Battery and SuperCap Chargers
- Accurate Current Limited Voltage Regulators
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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
- LT3796 Demo Circuit - Boost LED Driver with Input Current Monitor (9-60V to 85V LED String @ 400mA)
- LT3796 Demo Circuit - Boost LED Driver with Output Short Circuit Protection & LED Current Monitor (9-60V to 85V LED String @ 400mA)
- LT3796-1/LTC1541 Demo Circuit - SEPIC LED Driver with 100:1 Analog Dimming (8-20V to 35V String @ 1A)
- 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:
LT3796
LT3796-1
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.
