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Product Detailed Parameters
- Description：IC REG CTRLR FWRD CONV 20SSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- 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 is a synchronous dual transistor forward controller designed for high-power DC/DC converter applications. It operates at a fixed switching frequency of 350 kHz and supports adjustable output voltages with current capabilities up to 20 A. The device features bootstrap start functionality, simplifying the drive circuitry for high-side transistors. It is rated for an automotive temperature range, functioning reliably from -40°C to +125°C. The component is housed in a 20-pin SSOP package, providing isolation capability for single-output configurations.
Feature Summary
- Employs fixed frequency current mode control architecture
- Features bootstrap start mechanism for dual transistor drive
- Supports synchronous rectification for improved efficiency
- Capable of operating within extended automotive temperature ranges
Applications
- High power synchronous dual transistor forward DC/DC converters
- Automotive power supply systems requiring isolated outputs
- Industrial equipment utilizing step-up or step-down voltage conversion
- Systems needing simplified design for forward converter topologies
Procurement Notes
Verify the specific ordering suffix, such as #PBF or #TRPBF, to confirm lead-free compliance and tube versus tape-and-reel packaging formats. Confirm that the intended application aligns with the automotive grade specifications if environmental robustness is required. Ensure compatibility with the 20-pin SSOP footprint during PCB layout verification. Check for end-of-life status or obsolescence notices from Analog Devices before finalizing procurement plans.
Selection Notes
Select this controller when designing high-power forward converters requiring synchronous rectification. The fixed 350 kHz frequency allows for optimized magnetic component sizing. Consider the bootstrap start feature to reduce external gate drive complexity. Verify that the input voltage range and output current requirements fall within the operational limits defined in the datasheet. Evaluate thermal management needs given the SSOP package constraints.
Part Context
The LT3781 series simplifies the design of high-power synchronous dual transistor forward DC/DC converters. The LT3781IG variant specifically targets automotive applications, offering reliability across a wide temperature range. It utilizes fixed frequency current mode control to manage power delivery efficiently. The controller integrates necessary logic for driving both high-side and low-side transistors in a forward topology.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Cross-reference with other Linear Technology forward controllers only after verifying electrical parameter compatibility and pinout alignment.
