LT1768 - High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime
Features
- Ultrawide Multimode Dimming™ Range
- Multiple Lamp Capability
- Programmable PWM Dimming Range and Frequency
- Precision Maximum and Minimum Lamp Currents Maximize Lamp Lifetime
- No Lamp Flicker Under All Supply and Load Conditions
- Open Lamp Detection and Protection
- 350kHz Switching Frequency
- 1.5A MOSFET Gate Driver
- 100mV Current Sense Threshold
- 5V Reference Voltage Output
- The 16-Lead SSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT1768 is designed to control single or multiple cold cathode fluorescent lamp (CCFL) displays. A unique Multimode Dimming scheme* combines both linear and PWM control functions to maximize lamp life, efficiency, and dimming range. Accurate maximum and minimum lamp currents can be easily set. The LT1768 can detect and protect against lamp failures and overvoltage start-up conditions. It is designed to provide maximum flexibility with a minimum number of external components.The LT1768 is a current mode PWM controller with a 1.5A MOSFET driver for high power applications. It contains a 350kHz oscillator, 5V reference, and a current sense comparator with a 100mV threshold. It operates from an 8V to 24V input voltage. The LT1768 also has undervoltage lockout, thermal limit, and a shutdown pin that reduces supply current to 65µA. It is available in a small 16-lead SSOP 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 |
|---|---|---|---|---|---|
| LT1768CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LT1768CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LT1768IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1768IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LT1768CGN#PBF | SSOP-16 | C | $4.70 | $4.10 | Yes | |
| LT1768CGN#TRPBF | SSOP-16 | C | $4.16 | Yes | ||
| LT1768IGN#PBF | SSOP-16 | I | $5.10 | $4.50 | Yes | |
| LT1768IGN#TRPBF | SSOP-16 | I | $4.56 | 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 |
|---|---|---|---|
| DC354A | LT1768CGN | High Power Dual CCFL Power Supply with Ultrawide Multimode Dimming Range | $175.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT1768IGN#PBF | SSOP-16 | I | $5.10 | $4.50 | Yes | |
| LT1768IGN#TRPBF | SSOP-16 | I | $4.56 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Desktop Flat Panel Displays
- Multiple Lamp Displays
- Notebook LCD Displays
- Point of Sale Terminal Displays
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
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.
