LTC1698
LTC1698
PRODUCTIONIsolated Secondary Synchronous Rectifier Controller
- Part Models
- 8
- 1ku List Price
- Starting From $7.99
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Overview
- High Efficiency Over Wide Load Current Range
- ±0.8% Output Voltage Accuracy
- Dual N-Channel MOSFET Synchronous Drivers
- Pulse Transformer Synchronization
- Optocoupler Feedback Driver
- Programmable Current Limit Protection
- ±5% Margin Output Voltage Adjustment
- Adjustable Overvoltage Fault Protection
- Power Good Flag
- Auxiliary 3.3V Logic Supply
- Available in 16-Lead SSOP and SO Packages
The LTC1698 is a precision secondary-side forward converter controller that synchronously drives external N-channel MOSFETs. It is designed for use with the LT3781 primary-side synchronous forward converter controller to create a completely isolated power supply. The LT3781 synchronizes the LTC1698 through a small pulse transformer and the LTC1698 drives a feedback optocoupler to close the feedback loop. Output accuracy of ±0.8% and high efficiency over a wide range of load currents are obtained.
The LTC1698 provides accurate secondary-side current limit using an external current sense resistor. The input voltage at the MARGIN pin provides ±5% output voltage adjustment. A power good flag and overvoltage input are provided to ensure proper power supply conditions. An auxiliary 3.3V logic supply is included that supplies up to 10mA of output current.
Applications
- 48V Input Isolated DC/DC Converters
- Isolated Telecommunication Power Systems
- Distributed Power Step-Down Converters
- Industrial Control Systems
- Automotive and Heavy Equipment
Documentation
Data Sheet 1
User Guide 3
Design Note 2
Technical Articles 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 |
|---|---|---|---|
| LTC1698EGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1698EGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1698ES#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1698ES#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1698IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1698IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1698IS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1698IS#TRPBF | 16-Lead SOIC (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 |
||
| LTC1698EGN#PBF | PRODUCTION | |
| LTC1698EGN#TRPBF | PRODUCTION | |
| LTC1698IGN#PBF | PRODUCTION | |
| LTC1698IGN#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LTC1698EGN#PBF | PRODUCTION | |
| LTC1698EGN#TRPBF | PRODUCTION | |
| LTC1698IGN#PBF | PRODUCTION | |
| LTC1698IGN#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LTC1698EGN#PBF | PRODUCTION | |
| LTC1698EGN#TRPBF | PRODUCTION | |
| LTC1698IGN#PBF | PRODUCTION | |
| LTC1698IGN#TRPBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LTC1698ES#PBF | PRODUCTION | |
| LTC1698ES#TRPBF | PRODUCTION | |
| LTC1698IS#PBF | PRODUCTION | |
| LTC1698IS#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0252 Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package |
||
| LTC1698ES#PBF | PRODUCTION | |
| LTC1698ES#TRPBF | PRODUCTION | |
| LTC1698IS#PBF | PRODUCTION | |
| LTC1698IS#TRPBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG] |
||
| LTC1698ES#PBF | PRODUCTION | |
| LTC1698ES#TRPBF | PRODUCTION | |
| LTC1698IS#PBF | PRODUCTION | |
| LTC1698IS#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC1698
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
LT3781EG, LTC1698EGN, LT1783CS5 | Isolated Synchronous, Forward Converter, VIN=36V-72V, VOUT=3.3V @ 15A
Resources
LT3781EG LTC1698EGN LT1783CS5 | Isolated Synchronous Forward Converter, +VIN = 36V to 72V, +VOUT = 2.5V @ 20A, Quarter Brick Footprint
Resources
LT1952EGN, LTC1698EGN | 48VIN to 5V at 20A Converter, +VIN = 36V – 72V, +VOUT = +5V at 20A
Resources
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