LT8390IFE

Overview

The LT8390IFE is a synchronous 4-switch buck-boost DC/DC controller from Analog Devices Inc. It regulates output voltage, input current, or output current when the input voltage is above, below, or equal to the output voltage. The device operates with an input voltage range of 4V to 60V and supports switching frequencies between 190kHz and 630kHz. It features a 28-TSSOP package with exposed pad, operating temperature range of -40°C to +125°C, and includes soft start, frequency control, and current limit functions.

Feature Summary

• Synchronous four-switch topology enabling efficient buck, boost, and buck-boost operation across varying input-output voltage relationships.
• Proprietary peak-buck/peak-boost current mode control for precise regulation of output voltage, input current, or output current.
• Integrated soft start, frequency synchronization, and current limiting capabilities for stable system startup and protection.

Applications

• Industrial power supplies requiring wide input voltage ranges
• Battery-powered systems where input voltage varies significantly relative to output
• Distributed power architectures in telecom and networking equipment
• Automotive electronics with fluctuating supply voltages

Procurement Notes

Verify the exact ordering suffix (e.g., #PBF vs #TRPBF) against the required packaging format. Confirm that the TSSOP-28EP package matches your PCB footprint requirements. Ensure compatibility with your target switching frequency range and thermal management strategy for high-current applications. Cross-reference the datasheet revision date to confirm latest electrical characteristics.

Selection Notes

Select this controller when input voltage may exceed, fall below, or equal the desired output voltage. It is suitable for applications demanding high efficiency across wide input ranges. Consider the 28-TSSOP package size and thermal performance. Evaluate external component selection for inductors and capacitors based on the chosen switching frequency and load current requirements.

Part Context

The LT8390 belongs to Analog Devices' family of high-voltage synchronous buck-boost controllers. It complements other PMIC solutions by offering flexible topology operation without requiring complex multi-rail designs. The part is designed for robust performance in industrial and automotive environments, supporting both surface-mount assembly and high-reliability applications.

Replacement Considerations

LT8390IFE#TRPBF offers tape-and-reel packaging instead of tube. Direct functional equivalents within the same family include LT8390HUFD variants with different package options. Verify pinout compatibility and thermal characteristics when substituting packages.

FAQ

What control scheme does the LT8390IFE use?

It uses a proprietary peak-buck/peak-boost current mode control scheme for regulating output voltage, input current, or output current.

Can the LT8390IFE handle input voltages lower than the output voltage?

Yes, it is a synchronous 4-switch buck-boost controller designed to regulate output even when the input voltage is below, equal to, or above the output voltage.

What is the maximum operating temperature for this device?

The LT8390IFE supports an extended operating temperature range up to +125°C.