LT3512 - Monolithic High Voltage Isolated Flyback Converter
Features
- 4.5V to 100V Input Voltage Range
- Internal 420mA, 150V Power Switch
- Boundary Mode Operation
- No Transformer Third Winding or Opto-Isolator Required for Regulation
- Improved Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- BIAS Pin for Internal Bias Supply and Power Switch Driver
- No External Start-Up Resistor
- 16-Lead MSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 420mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.
The LT3512 operates from an input voltage range of 4.5V to 100V and delivers up to 4.5W of isolated output power. Two external resistors and the transformer turns ratio easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery.
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 | |
|---|---|---|---|---|---|---|
| LT3512EMS#PBF | MS-16 | E | $4.50 | $3.15 | Yes | |
| LT3512EMS#TRPBF | MS-16 | E | $3.21 | Yes | ||
| LT3512HMS#PBF | MS-16 | H | $5.54 | $3.88 | Yes | |
| LT3512HMS#TRPBF | MS-16 | H | $3.94 | Yes | ||
| LT3512IMS#PBF | MS-16 | I | $4.96 | $3.47 | Yes | |
| LT3512IMS#TRPBF | MS-16 | I | $3.53 | Yes | ||
| LT3512MPMS#PBF | MS-16 | MP | $13.36 | $9.35 | Yes | |
| LT3512MPMS#TRPBF | MS-16 | MP | $9.41 | 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 |
|---|---|---|---|
| DC1803A | LT3512EMS Demo Board | 36V to 75VIN, VOUT = 5V @ 500mA | $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 | |
|---|---|---|---|---|---|---|
| LT3512HMS#PBF | MS-16 | H | $5.54 | $3.88 | Yes | |
| LT3512HMS#TRPBF | MS-16 | H | $3.94 | Yes | ||
| LT3512IMS#PBF | MS-16 | I | $4.96 | $3.47 | Yes | |
| LT3512IMS#TRPBF | MS-16 | I | $3.53 | Yes | ||
| LT3512MPMS#PBF | MS-16 | MP | $13.36 | $9.35 | Yes | |
| LT3512MPMS#TRPBF | MS-16 | MP | $9.41 | Yes | ||
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|---|---|
| LT3512EMS#PBF | MS-16 | MS | E | 05-08-1847 | Yes |
| LT3512EMS#TRPBF | MS-16 | MS | E | 05-08-1847 | Yes |
| LT3512HMS#PBF | MS-16 | MS | H | 05-08-1847 | Yes |
| LT3512HMS#TRPBF | MS-16 | MS | H | 05-08-1847 | Yes |
| LT3512IMS#PBF | MS-16 | MS | I | 05-08-1847 | Yes |
| LT3512IMS#TRPBF | MS-16 | MS | I | 05-08-1847 | Yes |
| LT3512MPMS#PBF | MS-16 | MS | MP | 05-08-1847 | Yes |
| LT3512MPMS#TRPBF | MS-16 | MS | MP | 05-08-1847 | Yes |
Applications
- Isolated Telecom Power Supplies
- Isolated Auxiliary/Housekeeping Power Supplies
- Isolated Industrial, Automotive and Medical Power Supplies
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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:
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Models for the following parts are available in LTspice:
LT3512
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.
