LT3804
PRODUCTIONSecondary Side Dual Output Controller with Opto Driver
- Part Models
- 2
- 1ku List Price
- Starting From $8.16
Overview
- Regulates Two Secondary Outputs
- Optocoupler Feedback Driver and Second Output Synchronous Driver Controller
- True Differential Remote Sensing Regulation
- High Switching Frequency: up to 800kHz
- Programmable Current Limit
- Programmable Soft-Start and Power Good
- Automatic Frequency Synchronization
- Available in Thermally Enhanced 28-Lead TSSOP
The LT3804 is a high efficiency step-down switching regulator with optocoupler feedback control for regulating multiple outputs in single-secondary winding isolated power supplies.
The LT3804 contains an error amplifier and an optocoupler driver to regulate the first (main) output. For the second output regulation, the LT3804 contains a complete PWM controller to drive dual synchronous N-channel MOSFETs. With leading edge modulation, it operates with either current or voltage mode control of the primary side. The LT3804 is synchronized to the falling edge of the transformer secondary winding and can be used in single ended or double-ended isolated power converter topologies. A user selectable discontinuous conduction mode improves light load efficiency.
True differential Kelvin sensing is used for each output feedback amplifier to achieve high regulation accuracy and design simplicity. Other features include soft start, current limit and power good flags.
Applications
- 48V Input Isolated DC/DC Converters
- Multiple Output Power Supplies
- Offline Converters
- DC/DC Power Modules
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 |
|---|---|---|---|
| LT3804EFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3804EFE#TRPBF | 28-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3804EFE#PBF | PRODUCTION | |
| LT3804EFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3804EFE#PBF | PRODUCTION | |
| LT3804EFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LT3804EFE LT3781EG LTC1693-1IS8 | Dual Output Isolated Power Supply, 36V to 72V Input, +Vo1 = 3.3V @ 15A, +Vo2 = 1.8V @ 15A
Resources
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