LTC3806

PRODUCTION

Synchronous Flyback DC/DC Controller

Part Models: 2
1ku List Price: Starting From $5.21

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Overview

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 × 4mm 12-Pin DFN Package

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.

Applications

48V Telecom Supplies
12V/42V Automotive
24V Industrial
VoIP Phone
Power Over Ethernet

Part Models: 2
1ku List Price: Starting From $5.21

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3806EDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3806EDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3806

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.