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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 LT3781EG#PBF is a synchronous dual transistor forward converter controller from Analog Devices Inc. It supports input voltages of 8 V to 72 V and operates at switching frequencies up to 700 kHz with 100% duty cycle capability. The device features current mode PWM control and provides isolation. It is housed in a 20-SSOP package (5.30 mm width) and functions within an operating temperature range of -40°C to 85°C. The component includes bootstrap start functionality for dual transistor operation.
Feature Summary
- Synchronous dual transistor forward converter controller architecture
- Current mode PWM control with 100% duty cycle capability
- Bootstrap start mechanism for gate drive initialization
- Isolated output configuration support
Applications
- High power synchronous forward DC/DC converters
- Industrial power supply designs requiring isolation
- Systems utilizing bootstrap start topology
Procurement Notes
Verify the specific suffix against official Analog Devices documentation to confirm package type and lead-free status. Ensure the ordering part number matches the required thermal grade and packaging format. Cross-reference the datasheet revision date to validate parameter accuracy before procurement.
Selection Notes
Select this controller for applications requiring synchronous rectification in forward topologies. Consider the 8 V to 72 V input range and 700 kHz maximum frequency when designing magnetic components. Verify that the 20-SSOP package fits the PCB layout constraints and thermal requirements of the target environment.
Part Context
The LT3781 series simplifies high-power synchronous forward converter designs. The EG#PBF variant specifically denotes the commercial temperature grade (-40°C to 85°C) and tube packaging. It belongs to the PMIC family of DC/DC switching controllers, distinct from automotive-grade variants which may have extended temperature ranges.
Replacement Considerations
Public confirmed substitutes include LT3781IG#PBF for industrial temperature range and LT3781EG#TRPBF for tape and reel packaging. Verify pin compatibility and electrical specifications before substitution.
