LTC3789EUFD#TRPBF

DC DC Switching Controllers Overview

The LTC3789EUFD#TRPBF is a high-performance synchronous buck-boost controller from Analog Devices. It operates with an input voltage range of 4V to 38V and supports output voltages from 0.8V to 38V. The device utilizes a single inductor architecture to maintain regulation when the input voltage is above, below, or equal to the output. It features a constant frequency current mode control scheme with a switchable frequency up to 600kHz. The controller integrates four N-channel MOSFET drivers for synchronous rectification, achieving efficiency up to 98%. It includes a 5.5V LDO for internal power supply and offers programmable current limiting and protection features.

DC DC Switching Controllers Feature Summary

• Single inductor architecture enables stable operation across buck, boost, and pass-through modes
• Integrated four-way N-channel MOSFET driver eliminates external component count and reverse current issues
• Selectable pulse skip or forced continuous operation modes optimize efficiency and noise performance
• Built-in 5.5V LDO provides dedicated power for gate drivers and control circuitry

DC DC Switching Controllers Applications

• Automotive systems requiring wide input voltage tolerance
• Telecommunications equipment power management
• High-power battery-powered systems
• Industrial power supplies

DC DC Switching Controllers Procurement Notes

Verify the specific suffix EUFD confirms the 28-pin QFN package and industrial temperature grade. Confirm the TRPBF designation indicates tape and reel packaging. Ensure compatibility with the intended switching frequency and thermal requirements for the application environment.

DC DC Switching Controllers Selection Notes

Select this component for applications demanding seamless transition between buck and boost modes without discontinuous conduction. Consider the 600kHz maximum frequency for compact magnetic design. Evaluate the need for PLL synchronization if multiple phases are required in the system design.

DC DC Switching Controllers Part Context

The LTC3789 series represents Linear Technology's solution for complex power conversion needs where input voltage fluctuates significantly around the output level. It replaces traditional multi-stage solutions by integrating buck-boost functionality into a single controller, simplifying board layout and reducing component count in high-reliability designs.

DC DC Switching Controllers Replacement Considerations

LTC3789EGN#TRPBF (SSOP package variant)

DC DC Switching Controllers FAQ

How does the LTC3789 handle transitions between buck and boost modes?

It uses a single inductor architecture that allows continuous current flow, ensuring stable regulation whether the input voltage is higher than, lower than, or equal to the output voltage.

What determines the operating mode of the LTC3789?

The MODE/PLLIN pin selects between pulse skip mode for light-load efficiency and forced continuous mode for low-noise applications, and also allows synchronization to an external clock.