LTC3705
NOT RECOMMENDED FOR NEW DESIGNS2-Switch Forward Controller and Gate Driver
- Part Models
- 4
- 1ku List Price
- Starting From $4.02
Overview
- High-Speed Top and Bottom Gate Drivers for
- 2-Switch Forward Converter
- On-Chip Rectifier and Self-Starting Architecture
- Eliminate Need for Separate Gate Drive Bias Supply
- Wide Input Voltage Supply Range: 18V to 80V
- Tolerant of 100V Input Voltage Transients
- Linear Regulator Controller for Fast Start-Up
- Precision UVLO with Adjustable Hysteresis
- Overcurrent Protection
- Volt-Second Limit Prevents Transformer Core Saturation
- Voltage Feedforward for Fast Transient Response
- Available in 16-Lead Narrow SSOP Package
The LTC3705 is a controller for a 2-switch forward converter and includes on-chip bottom and top gate drivers that do not require external transformers. For secondary-side control, combine the LTC3705 with the LTC3706 PolyPhase® secondary-side synchronous forward controller to create a complete forward converter using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals across the isolation barrier through a tiny pulse transformer. The on-chip rectifier and the same pulse transformer provide gate drive bias power.
Alternatively, the LTC3705 can be used as a standalone voltage mode controller in a primary-side control architecture with optoisolator feedback. Voltage feedforward provides excellent line regulation and transient response.
Applications
- Isolated 48V Telecommunication Systems
- Internet Servers and Routers
- Distributed Power Step-Down Converters
- Automotive and Heavy Equipment
Documentation
Data Sheet 1
User Guide 1
Design Note 1
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 |
|---|---|---|---|
| LTC3705EGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3705EGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3705IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3705IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC3705EGN#PBF | PRODUCTION | |
| LTC3705EGN#TRPBF | PRODUCTION | |
| LTC3705IGN#PBF | PRODUCTION | |
| LTC3705IGN#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LTC3705EGN#PBF | PRODUCTION | |
| LTC3705EGN#TRPBF | PRODUCTION | |
| LTC3705IGN#PBF | PRODUCTION | |
| LTC3705IGN#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LTC3705EGN#PBF | PRODUCTION | |
| LTC3705EGN#TRPBF | PRODUCTION | |
| LTC3705IGN#PBF | PRODUCTION | |
| LTC3705IGN#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3765 | RECOMMENDED FOR NEW DESIGNS | Active Clamp Forward Controller and Gate Driver |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3705
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.
Evaluation Kits
LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, VOUT = 1.5V @ 45A