LT8705AHFE

Overview

The LT8705AHFE is a high-performance synchronous buck-boost switching regulator controller from Analog Devices Inc. It operates with input voltages above, below, or equal to the output voltage. The device supports an input supply range of 2.8V to 80V and features a programmable switching frequency between 100kHz and 400kHz. It integrates feedback loops for input current, input voltage, output current, and output voltage. The component is housed in a 38-TSSOP-EP package and functions within a temperature range of -40°C to 150°C.

Feature Summary

• Supports operation with input voltages higher than, lower than, or equal to the output voltage
• Integrates closed-loop control for input current, input voltage, output current, and output voltage
• Features synchronous rectification with clock synchronization capability

Applications

• Supercapacitor backup power systems
• Industrial distributed power supplies
• Battery-powered equipment requiring wide input ranges

Procurement Notes

Verify the specific suffix (PBF vs TRPBF) against the required packaging format. Confirm that the 38-TSSOP-EP package matches the PCB footprint requirements. Ensure the operating temperature range meets the environmental specifications of the target application. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability status.

Selection Notes

Select this controller when the application requires a single-stage solution for variable input sources such as supercapacitors or batteries. The integrated multi-loop feedback simplifies design complexity compared to discrete solutions. Consider the 80V maximum rating for high-voltage industrial applications. Evaluate the thermal performance of the TSSOP-EP package for heat dissipation needs.

Part Context

The LT8705 series represents Analog Devices' approach to versatile DC-DC conversion. This model specifically addresses scenarios where input voltage fluctuates significantly relative to the load requirement. It serves as a core component in power management architectures demanding high efficiency across varying line conditions without multiple conversion stages.

Replacement Considerations

Check Analog Devices datasheets for direct pin-compatible alternatives within the LT8705 family. Verify if other models offer different switching frequencies or current capabilities while maintaining the same 38-TSSOP-EP form factor.