LTC6908 - Dual Output Oscillator with Spread Spectrum Modulation
LTC6909 - 1 to 8 Output, Multiphase Oscillator with Spread Spectrum Modulation
LT3837 - Isolated No-Opto Synchronous Flyback Controller
Features
- Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
- Synchronous Driver for High Efficiency
- Supply Voltage Range 4.5V to 20V
- Accurate Regulation Without User Trims
- Programmable Switching Frequency from 50kHz to 250kHz
- Synchronizable
- Load Compensation
- Undervoltage Lockout
- Available in a Thermally Enhanced 16-Lead TSSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3837 is an isolated switching regulator controller designed for medium power flyback topologies. A typical application is 10W to 60W with the part powered from a DC supply.
The LT3837 is a current mode controller that regulates an output voltage based on sensing the secondary voltage via a transformer winding during flyback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectification increases converter efficiency and improves output cross regulation in multiple output converters.
The LT3837 operates in forced continuous conduction mode which improves cross regulation in multiple winding applications. Switching frequency is user programmable and can be externally synchronized. The part also has load compensation, undervoltage lockout and soft-start circuitry.
The LT3837 is available in a thermally enhanced 16-pin TSSOP 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 |
|---|---|---|---|---|---|
| LT3837EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT3837EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT3837IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | Yes |
| LT3837IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | 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 | |
|---|---|---|---|---|---|---|
| LT3837EFE#PBF | TSSOP-16 | E | $4.43 | $3.10 | Yes | |
| LT3837EFE#TRPBF | TSSOP-16 | E | $3.16 | Yes | ||
| LT3837IFE#PBF | TSSOP-16 | I | $4.69 | $3.28 | Yes | |
| LT3837IFE#TRPBF | TSSOP-16 | I | $3.34 | 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 |
|---|---|---|---|
| DC1038A-A | LT3837EFE | 9V -36V input to 3.3V at 10A Sync. Flyback Converter | $225.00 | |
| DC1038A-B | LT3837EFE | 9V -36V input to 5V at 7A Sync. Flyback Converter | $200.00 | |
| DC1038A-C | LT3837EFE | 9V -36V input to 12V at 3A Sync. Flyback Converter | $175.00 | |
| DC950A-B | LT3837EFE Demo Board | 9V ≤ Vin ≤ 36V, Vout: 5V/2A, 3.3V/3A, 2.5V/3A | $150.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT3837IFE#PBF | TSSOP-16 | I | $4.69 | $3.28 | Yes | |
| LT3837IFE#TRPBF | TSSOP-16 | I | $3.34 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Isolated Medium Power (10W to 60W) Supplies
- Instrumentation Power Supplies
- Isolated Medical Supplies
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Product Notifications
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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
Models for the following parts are available in LTspice:
LT3837
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.
