LT8705MPFE

Overview

The LT8705MPFE is a synchronous four-switch buck-boost switching regulator controller from Analog Devices. It supports input and output voltages up to 80V, enabling operation with input voltages above, below, or equal to the output voltage. The device integrates two N-channel power MOSFET drivers for high-efficiency conversion in wide input range applications. Packaged in a 38-lead TSSOP with an exposed pad, it is designed for robust performance in demanding power management scenarios.

Feature Summary

• Synchronous four-switch buck-boost topology supporting input and output voltages up to 80V
• Operates with input voltages above, below, or equal to the regulated output voltage
• Integrated dual N-channel power MOSFET drivers for efficient DC/DC conversion

Applications

• Supercapacitor backup power systems
• Wide input voltage DC/DC conversion
• Industrial power management modules

Procurement Notes

Verify the specific ordering suffix (PBF vs TRPBF) against the required packaging format, as the base part number may correspond to tube or tape-and-reel configurations depending on the full designation. Confirm lead times and availability status directly with authorized distributors, as supply constraints may apply. Ensure the 38-TSSOP-EP package compatibility matches the target PCB footprint before finalizing procurement orders.

Selection Notes

Select this component when an application requires a single-stage solution for wide input voltage ranges exceeding standard buck or boost limits. The integrated driver capability reduces external component count compared to discrete solutions. Evaluate thermal requirements based on the exposed pad package design to ensure adequate heat dissipation for the intended current load and ambient conditions.

Part Context

This controller belongs to the LT8705 family of high-voltage buck-boost regulators. It serves as a control IC requiring external power switches or utilizing its internal drivers, distinct from complete converter modules. The MPFE variant specifies the military/extended temperature grade and tube packaging within the broader product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin-to-pin compatibility and electrical parameter equivalence with alternative high-voltage buck-boost controllers if direct replacement is necessary.