LTC3806 - Synchronous Flyback DC/DC Controller
Features
- High Efficiency at Full Load
- Better Cross Regulation Than Nonsynchronous Converters (Multiple Outputs)
- Soft-Start Minimizes Inrush Current
- Current Mode Control Provides Excellent Transient Response
- High Maximum Duty Cycle: 89% Typical
- ±2% Programmable Undervoltage Lockout Threshold
- ±1% Internal Voltage Reference
- Micropower Start-Up
- Constant Frequency Operation (Never Audible) 3mm x 4mm 12-Pin DFN Package
Typical Application
Description
The LTC3806 is a current mode synchronous flyback controller that drives N-channel power MOSFETs and requires very few external components. It is intended for medium power applications where multiple outputs are required. Synchronous rectification provides higher efficiency and improved output cross regulation than nonsynchronous converters.
The IC contains all the necessary control circuitry including a 250kHz oscillator, precision undervoltage lockout circuit with hysteresis, gate drivers for primary and synchronous switches, current mode control circuitry and soft-start circuitry.
Programmable soft-start reduces inrush currents. This makes it easier to design compliant Power Over Ethernet supplies.
Low start-up current reduces power dissipation in the start-up resistor and reduces the size of the external startup capacitor.
The LTC3806 is available in a 12-pin, exposed pad DFN 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 |
|---|---|---|---|---|---|
| LTC3806EDE#PBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | Yes |
| LTC3806EDE#TRPBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | 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 | |
|---|---|---|---|---|---|---|
| LTC3806EDE#PBF | 4x3 DFN-12 | E | $5.00 | $3.40 | Yes | |
| LTC3806EDE#TRPBF | 4x3 DFN-12 | E | $3.50 | 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 |
|---|---|---|---|
| DC659A | LTC3806EDE | Synchronous Flyback Regulator, 4 Output, Vin = 25V - 60V, Vout1 = 12V @ 400mA, Vout2 = 5V @ 400mA, Vout3 = 3.3V @ 3A, Vout4 = 2.5V @ 2A | Contact Factory | |
| Buy Now | |||
Applications
- 48V Telecom Supplies
- 12V/42V Automotive
- 24V Industrial
- VoIP Phone
- Power Over Ethernet
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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:
LTC3806
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.
