LT8708HUHG-1#PBF

Overview

The LT8708HUHG-1#PBF is a synchronous four-switch buck-boost DC/DC controller from Analog Devices, designed for high-voltage bidirectional power conversion. It supports input voltages ranging from 2.8V to 80V and output voltages from 1.3V to 80V, with a typical output current capability of 15A. The device operates at switching frequencies between 100kHz and 400kHz and features a maximum duty cycle of 80%. It utilizes a 40-pin QFN package (5mm × 8mm) and is rated for an extended operating temperature range of -40°C to +150°C, suitable for automotive applications.

Feature Summary

• Supports bidirectional power transfer with input voltage higher than, lower than, or equal to output voltage
• Provides six independent regulation modes including VIN/VOUT voltage and forward/reverse current control
• Features high-efficiency synchronous rectification up to 99% with integrated mode switching capabilities
• Includes programmable current limiting for all four power directions via external resistors

Applications

• Automotive 48V systems
• Bidirectional charging systems
• High-voltage buck-boost converters
• Humanoid robot joint power supplies

Procurement Notes

Verify the specific HUHG suffix indicates the extended 150°C junction temperature rating required for your application environment. Confirm that the -1#PBF designation corresponds to the tube packaging format rather than tape-and-reel. Ensure compatibility with AEC-Q100 automotive qualification standards if deploying in vehicle electronics. Check for recent Product Change Notifications regarding manufacturing site updates.

Selection Notes

Select this component when designing systems requiring true bidirectional energy flow between two voltage rails where one may exceed the other. The wide input range accommodates battery discharge profiles without requiring complex topology changes. Consider the thermal performance of the exposed pad QFN package for high-current dissipation scenarios. Verify that the 15A current rating meets peak load requirements under worst-case thermal conditions.

Part Context

This part belongs to the LT8708 series of synchronous buck-boost controllers, which includes EUHG and IUHG variants with standard industrial temperature ratings. The HUHG variant specifically extends the operating temperature to +150°C, making it distinct within the family for harsh environment applications. All variants share the same core architecture and pinout but differ in thermal endurance specifications.

Replacement Considerations

LT8708EUHG-1#PBF offers identical functionality with a lower maximum operating temperature of 125°C. LT8708IUHG-1#PBF provides similar industrial-grade performance. No direct cross-brand replacements are documented in official sources; redesign may be necessary for alternative topologies.