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Product Detailed Parameters
- Description：IC REG CTRLR FWRD CONV 20SSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive, Isolation Capable
- Topology：Forward Converter
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：9V ~ 18V
- Frequency - Switching：700kHz
- Duty Cycle (Max)：-
- Synchronous Rectifier：No
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Enable, Soft Start
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：20-SSOP (0.209", 5.30mm Width)
- Supplier Device Package：20-SSOP
- Grade：-
- Qualification：-
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Overview
The LT3781IG#TRPBF is a bootstrap start dual transistor synchronous forward controller manufactured by Analog Devices Inc. It operates at a fixed switching frequency of 350 kHz and supports external synchronization up to this limit. The device is designed for high-power synchronous dual transistor forward DC/DC converters, utilizing current mode control to simplify design. It features an automotive-grade temperature range of -40°C to 85°C (TA) and is housed in a 20-SSOP package with a width of 5.30mm.
Feature Summary
- Bootstrap start capability simplifies initial power-up sequences for transformer-coupled applications.
- Dual transistor synchronous forward topology support enables efficient high-power conversion designs.
- Fixed frequency operation at 350 kHz allows for predictable electromagnetic interference filtering.
Applications
- High power synchronous dual transistor forward DC/DC converters
- Automotive power supply systems requiring wide temperature tolerance
- Isolated output DC/DC converter designs
Procurement Notes
Verify the specific suffix configuration against official Analog Devices documentation to ensure compatibility with required packaging and temperature grades. Confirm that the 20-SSOP package dimensions align with PCB footprint requirements. Cross-reference the automotive grade designation (-40°C to 85°C) with system environmental specifications to validate operational suitability for the intended application environment.
Selection Notes
Select this component when designing high-power forward converters requiring synchronous rectification and bootstrap startup. Ensure the design accommodates the 350 kHz switching frequency constraints. Verify that the external synchronization range does not exceed the internal oscillator limit. Consider thermal management strategies appropriate for the SSOP package in high-current applications.
Part Context
The LT3781 series includes variants such as LT3781EG and LT3781IG, differentiated primarily by temperature ranges and packaging options. The IG suffix denotes the automotive-grade version suitable for broader environmental conditions. This controller belongs to Analog Devices' family of switching voltage regulators focused on forward converter topologies.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Evaluate cross-model compatibility within the LT3781 family based on suffix variations for temperature and package differences.
