LTC3859IFE#PBF

DC DC Switching Controllers Overview

The LTC3859IFE#PBF is a high-performance triple output synchronous DC/DC switching regulator controller from Analog Devices. It supports buck, buck, and boost topologies with an input voltage range of 4.5V to 38V. The device features a constant frequency current mode architecture with a phase-lockable switching frequency up to 850kHz. It drives all N-channel power MOSFET stages and includes integrated soft start, tracking, and power good signals. Operating supply voltage ranges from 4.5V to 38V, with a typical supply current of 3mA.

DC DC Switching Controllers Feature Summary

• Triple output capability supporting buck/buck/boost configurations
• Phase-lockable switching frequency up to 850kHz
• Integrated soft start, tracking, and power good functions

DC DC Switching Controllers Applications

• Industrial control systems requiring multiple voltage rails
• Telecommunications infrastructure power distribution
• Automotive electronics with wide input voltage variations

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates lead-free RoHS compliance when ordering. Confirm the TSSOP-EP-38 package availability through authorized distributors. Ensure design compatibility with external N-channel MOSFET selection for the required current loads. Check for automotive grade variants if operating in extended temperature environments beyond standard industrial limits.

DC DC Switching Controllers Selection Notes

Select this controller for designs needing three independent regulated outputs from a single wide-range input. Consider the 850kHz maximum frequency for balancing component size against transient response requirements. Evaluate thermal management needs based on the TSSOP-EP-38 package's exposed pad requirements. Verify that external MOSFETs can handle the peak currents associated with the chosen topology configuration.

DC DC Switching Controllers Part Context

The LTC3859 belongs to Analog Devices' family of high-efficiency synchronous controllers. It is designed for applications demanding precise regulation across multiple rails. The IFE variant specifically denotes the TSSOP-EP-38 package option. This component serves as a central power management element in complex multi-rail systems.

DC DC Switching Controllers FAQ

What is the minimum operating input voltage after startup?

While the standard operating range starts at 4.5V, the device can operate from an input supply as low as 2.5V after startup when biased from the output of the boost converter or another auxiliary supply.

Does the LTC3859 support clock synchronization?

No, the datasheet specifications indicate that clock synchronization is not available for this controller model.