LT8708EUHG-1#PBF

Overview

The LT8708EUHG-1#PBF is a synchronous four-switch buck-boost DC/DC controller from Analog Devices. It supports bidirectional power flow with an input voltage range of 2.8V to 80V and an output range of 1.3V to 80V. The device operates at switching frequencies up to 400kHz and delivers up to 15A output current. It features six independent regulation modes for VIN, VOUT, and bidirectional currents. Packaged in a 40-pin QFN (5mm x 8mm), it is AEC-Q100 qualified for industrial applications operating between -40°C and +125°C.

Feature Summary

• Bidirectional power transfer capability supporting energy flow in both directions between input and output ports.
• Six independent regulation modes allowing separate control of input/output voltages and forward/reverse currents.
• Flexible conduction mode selection including DCM, CCM, HCM, and Burst Mode for optimized efficiency.
• High integration within a compact 40-pin QFN package designed for high-voltage safety.

Applications

• Automotive 48V systems
• Battery and capacitor backup systems
• Humanoid robot dual-battery energy storage
• Servo braking energy recovery

Procurement Notes

Verify the specific suffix '-1' against the manufacturer datasheet to confirm pinout or functional variations compared to standard LT8708 variants. Ensure the supply chain source provides valid RoHS compliance documentation. Confirm that the 40-pin QFN package matches the PCB footprint requirements. Check for any recent Product Change Notifications regarding assembly origin or material declarations before finalizing procurement orders.

Selection Notes

Select this component when input and output voltages may cross each other or require bidirectional energy management. It is suitable for applications needing precise current limiting on both input and output sides. Consider the 400kHz switching frequency for size constraints. Verify that the external MOSFETs can handle the required 15A current and voltage ratings. Ensure the system design accommodates the 2.8V minimum supply requirement.

Part Context

This part belongs to the LT8708 series of synchronous buck-boost controllers. The EUHG suffix denotes the industrial temperature grade (-40°C to +125°C). The '-1' suffix indicates a specific revision or variant within the Analog Devices portfolio. It shares the core topology with the IUHG and HUHG models but differs in thermal specifications and automotive qualification levels.

Replacement Considerations

LT8708IUHG-1#PBF offers identical electrical performance with potential batch-specific testing differences. LT8708HUHG-1#PBF provides extended temperature range up to 150°C for harsher environments. Standard LT8708EUHG without the '-1' suffix may have minor pinout or feature variations requiring schematic review.

FAQ

Does the LT8708EUHG-1#PBF support bidirectional current flow?

Yes, the device supports true bidirectional power transfer, allowing energy to flow from VIN to VOUT and vice versa.

What is the maximum switching frequency?

The maximum switching frequency is 400kHz.

How many independent regulation modes are available?

There are six independent regulation modes: VIN voltage, VOUT voltage, VIN forward current, VIN reverse current, VOUT forward current, and VOUT reverse current.