LT3798
PRODUCTIONIsolated No Opto-Coupler Flyback Controller with Active PFC
- Part Models
- 8
- 1ku List Price
- Starting From $3.45
Overview
- Isolated PFC Flyback with Minimum Number of External Components
- VIN and VOUT Limited Only by External Components
- Active Power Factor Correction
- Low Harmonic Distortion
- No Opto-Coupler Required
- Constant-Current and Constant-Voltage Regulation
- Accurate Regulated Voltage and Current (±5% Typical)
- Energy Star Compliant (<0.5W No Load Operation)
- Thermally Enhanced 16-lead MSOP Package
The LT3798 is a constant-voltage/constant-current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, allowing compliance with most Harmonic Current Emission requirements.
The LT3798 is well suited for a wide variety of off-line applications. The input range can be scaled up or down, depending mainly on the choice of external components. Efficiencies higher than 86% can be achieved with output power levels up to 100W. In addition, the LT3798 can easily be designed into high DC input applications.
Applications
- Offline 5W to 100W+ Applications
- High DC VIN Isolated Applications
- Offline Bus Converter (12V, 24V or 48V Outputs)
Documentation
Data Sheet 1
User Guide 1
Technical Articles 2
Video 3
Product Selector Card 1
Brochure 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 |
|---|---|---|---|
| LT3798EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3798EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3798HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3798HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3798IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3798IMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3798MPMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3798MPMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LT3798EMSE#PBF | PRODUCTION | |
| LT3798EMSE#TRPBF | PRODUCTION | |
| LT3798IMSE#PBF | PRODUCTION | |
| LT3798IMSE#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT3798EMSE#PBF | PRODUCTION | |
| LT3798EMSE#TRPBF | PRODUCTION | |
| LT3798HMSE#PBF | PRODUCTION | |
| LT3798HMSE#TRPBF | PRODUCTION | |
| LT3798MPMSE#PBF | PRODUCTION | |
| LT3798MPMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3798EMSE#PBF | PRODUCTION | |
| LT3798EMSE#TRPBF | PRODUCTION | |
| LT3798HMSE#PBF | PRODUCTION | |
| LT3798HMSE#TRPBF | PRODUCTION | |
| LT3798IMSE#PBF | PRODUCTION | |
| LT3798IMSE#TRPBF | PRODUCTION | |
| LT3798MPMSE#PBF | PRODUCTION | |
| LT3798MPMSE#TRPBF | PRODUCTION | |
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LT3798HMSE#PBF | PRODUCTION | |
| LT3798HMSE#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3798IMSE#PBF | PRODUCTION | |
| LT3798IMSE#TRPBF | PRODUCTION | |
|
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM] |
||
| LT3798IMSE#PBF | PRODUCTION | |
| LT3798IMSE#TRPBF | PRODUCTION | |
|
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3798IMSE#PBF | PRODUCTION | |
| LT3798IMSE#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
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| Ideal Diodes and PowerPath Controllers 1 | ||
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Ideal Diode Bridge Controller | |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
| Temperature Sensors 1 | ||
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Tools & Simulations
LTspice 2
- LT3798/LT8309 Demo Circuit - Energy Star Compliant Isolated Converter (85-150VAC to 5V @ 2.2A)
- LT3798 Demo Circuit - Isolated No Opto-Coupler Flyback Controller with Active PFC (90-265VAC to 24V @ 2A)
Models for the following parts are available in LTspice:
- LT3798
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
LT3798EMSE Isolated Demo Board VIN = 90VAC to 265VAC, VOUT = 24V @ 2A High Voltage