LT3790IFE

Overview

The LT3790IFE is a synchronous four-switch buck-boost voltage and current regulator controller from Analog Devices. It operates with an input voltage range of 4.7V to 60V, supporting high-power applications up to 250W. The device regulates output voltage or current using a single inductor and controls four external MOSFETs. It features adjustable switching frequencies up to 700kHz and includes spread spectrum modulation for EMI reduction. The component is housed in a 38-pin TSSOP-EP package.

Feature Summary

• Synchronous four-switch buck-boost topology for efficient step-up and step-down conversion
• Integrated control of four external MOSFETs with a single inductor design
• Adjustable switching frequency with spread spectrum modulation capabilities
• Dual regulation modes for precise output voltage and current control

Applications

• High-power battery chargers requiring buck-boost capability
• Industrial power supplies with wide input voltage ranges
• Automotive systems needing robust voltage regulation
• LED drivers with constant current requirements

Procurement Notes

Verify the specific suffix (e.g., #PBF) against the manufacturer's official documentation to confirm lead-free compliance and packaging type. Ensure the order matches the exact pinout and thermal pad configuration required for the PCB layout. Cross-reference the datasheet revision to confirm all electrical characteristics align with the design specifications before procurement.

Selection Notes

Select this controller when designing systems requiring both step-up and step-down functionality within a 4.7V to 60V input window. It is suitable for applications demanding high efficiency and precise current regulation. Consider the external MOSFET selection carefully to handle the required current levels and thermal dissipation associated with the 250W power capability.

Part Context

The LT3790 belongs to Analog Devices' family of high-performance DC/DC controllers designed for complex power management tasks. Unlike standard regulators, it offers flexible topology options through external switch control. This specific variant integrates advanced features like spread spectrum modulation to minimize electromagnetic interference in sensitive environments.

Replacement Considerations

Direct replacements must match the synchronous four-switch buck-boost architecture and 60V rating. Verify compatibility with existing gate drive requirements and thermal management solutions. Check if alternative controllers support the same adjustable frequency range and dual regulation modes without requiring significant circuit redesign.