LTC1698
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LTC1698

Isolated Secondary Synchronous Rectifier Controller

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 8
1ku List Price Starting From $6.31
Features
  • 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
Additional Details
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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
Part Models 8
1ku List Price Starting From $6.31

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC1698EGN#PBF
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Product Lifecycle

PCN

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 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

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

arrow down

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

arrow down

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC1698EGN#PBF

PRODUCTION

LTC1698EGN#TRPBF

PRODUCTION

LTC1698IGN#PBF

PRODUCTION

LTC1698IGN#TRPBF

PRODUCTION

Oct 12, 2022

- 22_0252

arrow down

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

arrow down

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

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

reference details image

DC759A

LT1952EGN, LTC1698EGN | 48VIN to 5V at 20A Converter, +VIN = 36V – 72V, +VOUT = +5V at 20A

zoom

DC759A

LT1952EGN, LTC1698EGN | 48VIN to 5V at 20A Converter, +VIN = 36V – 72V, +VOUT = +5V at 20A

LT1952EGN, LTC1698EGN | 48VIN to 5V at 20A Converter, +VIN = 36V – 72V, +VOUT = +5V at 20A

Product Detail

DC759A Demo Board for:
LTC1698 Isolated Secondary Synchronous Rectifier Controller
LT1952 Single Switch Synchronous Forward Controller


 


reference details image

DC617A

LT3781EG LTC1698EGN LT1783CS5 | Isolated Synchronous Forward Converter, +VIN = 36V to 72V, +VOUT = 2.5V @ 20A, Quarter Brick Footprint

zoom

DC617A

LT3781EG LTC1698EGN LT1783CS5 | Isolated Synchronous Forward Converter, +VIN = 36V to 72V, +VOUT = 2.5V @ 20A, Quarter Brick Footprint

LT3781EG LTC1698EGN LT1783CS5 | Isolated Synchronous Forward Converter, +VIN = 36V to 72V, +VOUT = 2.5V @ 20A, Quarter Brick Footprint

Product Detail

DC617A Demo Board for:

LT1783 1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23

LTC1698 Isolated Secondary Synchronous Rectifier Controller

LT3781 Bootstrap Start Dual Transistor Synchronous Forward Controller

reference details image

DC479A

LT3781EG, LTC1698EGN, LT1783CS5 | Isolated Synchronous, Forward Converter, VIN=36V-72V, VOUT=3.3V @ 15A

zoom

DC479A

LT3781EG, LTC1698EGN, LT1783CS5 | Isolated Synchronous, Forward Converter, VIN=36V-72V, VOUT=3.3V @ 15A

LT3781EG, LTC1698EGN, LT1783CS5 | Isolated Synchronous, Forward Converter, VIN=36V-72V, VOUT=3.3V @ 15A

Product Detail

DC479A Demo Board for:
LT1783 1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23
LTC1698 Isolated Secondary Synchronous Rectifier Controller
LT3781 Bootstrap Start Dual Transistor Synchronous Forward Controller


 


Tools & Simulations

Tools & Simulations 1

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.

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