LTC3706 - Secondary-Side Synchronous Forward Controller with Polyphase Capability
Features
- Secondary-Side Control for Fast Transient Response
- Self-Starting Architecture Eliminates Need for Separate Bias Regulator
- Proprietary Gate Drive Encoding Scheme Reduces System Complexity
- PolyPhase® Operation Reduces CIN Requirements
- Current Mode Control Ensures Current Sharing
- PLL Fixed Frequency: 100kHz to 500kHz
- ±1% Output Voltage Accuracy
- True Remote Sense Differential Amplifier
- Power Good Output Voltage Monitor
- High Voltage Linear Regulator Controller
- Wide Supply Range: 5V to 30V
- Available in a Narrow 24-Lead SSOP Package
Typical Application
Description
The LTC3706 is a PolyPhase capable secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705 gate driver and primary-side controller, the part creates a complete isolated power supply that combines the power of PolyPhase operation with the speed of secondary-side control.The LTC3706 has been designed to simplify the design of highly efficient, secondary-side forward converters. Working in concert with the LTC3705, the LTC3706 forms a robust, self-starting converter that eliminates the need for the separate bias regulator that is commonly used in secondary-side control applications. In addition, a proprietary scheme is used to multiplex gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer.
The LTC3706 provides remote sensing, accurate power good and overvoltage monitoring circuits to support precision, high current applications. A linear regulator controller with thermal protection is also provided to simplify the generation of secondary-side bias voltage.
The LTC3706 is available in a 24-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 |
|---|---|---|---|---|---|
| LTC3706EGN#PBF | SSOP-24 | GN | E | 05-08-1641 (GN24) | Yes |
| LTC3706EGN#TRPBF | SSOP-24 | GN | E | 05-08-1641 (GN24) | Yes |
| LTC3706IGN#PBF | SSOP-24 | GN | I | 05-08-1641 (GN24) | Yes |
| LTC3706IGN#TRPBF | SSOP-24 | GN | I | 05-08-1641 (GN24) | 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 | |
|---|---|---|---|---|---|---|
| LTC3706EGN#PBF | SSOP-24 | E | $5.54 | $3.88 | Yes | |
| LTC3706EGN#TRPBF | SSOP-24 | E | $3.98 | Yes | ||
| LTC3706IGN#PBF | SSOP-24 | I | $6.11 | $4.28 | Yes | |
| LTC3706IGN#TRPBF | SSOP-24 | I | $4.38 | 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 |
|---|---|---|---|
| DC776A | LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, Vout = 1.5V @ 45A | $225.00 | |
| DC888A-A | LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ Vin ≤ 72V, Vout: 3.3V/50A | Contact Factory | |
| DC888A-B | LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ Vin ≤ 72V, Vout: 5V/40A | Contact Factory | |
| DC888A-C | LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ Vin ≤ 72V, Vout: 12V/20A | Contact Factory | |
| Buy Now | |||
Applications
- Isolated 48V Telecommunication Systems
- Internet Servers and Routers
- Distributed Power Step-Down Converters
- Automotive and Heavy Equipment
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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:
LTC3706
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.
