LT8708IUHG-1#PBF

Overview

The LT8708IUHG-1#PBF is an 80V synchronous four-switch buck-boost DC/DC controller from Analog Devices. It supports bidirectional power flow with input voltages ranging from 2.8V to 80V and output voltages from 1.3V to 80V. The device delivers up to 15A output current and operates at switching frequencies between 100kHz and 400kHz. It features six independent regulation modes for VIN/VOUT voltage and current control in both directions. The component is housed in a 40-pin QFN (5mm × 8mm) package and is rated for industrial temperatures from -40°C to +125°C.

Feature Summary

• Supports true bidirectional power transfer, allowing energy flow from VIN to VOUT or vice versa.
• Offers six independent regulation modes including VIN/VOUT voltage and forward/reverse current limiting.
• Features flexible conduction mode selection including DCM, CCM, HCM, and Burst Mode®.
• Integrated high-voltage pin spacing within a compact 40-pin QFN package.

Applications

• Automotive 48V power systems
• Battery and capacitor backup systems
• Humanoid robot joint power supplies
• Servo braking energy recovery

Procurement Notes

Verify the specific suffix 'IUHG' confirms the -40°C to +125°C industrial temperature range distinct from other variants. Confirm AEC-Q100 compliance requirements if automotive qualification is mandatory. Ensure external MOSFET selection matches the 80V rating and 15A current capability. Validate that the 40-pin QFN footprint aligns with the PCB layout design.

Selection Notes

Select this model when input and output voltages may cross each other during operation. Choose the IUHG variant for standard industrial environments requiring -40°C to +125°C coverage. Consider the HUHG variant only if operation exceeds 125°C. Ensure the application requires independent control of input and output currents for efficient energy management.

Part Context

This component belongs to the LT8708 series of synchronous buck-boost controllers. It shares core topology with the LT8708EUHG and LT8708HUHG but differs in temperature grading. The '-1' suffix indicates specific manufacturing lot characteristics defined by Analog Devices. It serves as a key PMIC for complex power architectures requiring high efficiency and flexibility.

Replacement Considerations

LT8708EUHG-1#PBF: Industrial grade (-40°C to +125°C), functionally equivalent.

FAQ

Does the LT8708IUHG-1#PBF support isolated topologies?

No, it is a non-isolated synchronous buck-boost controller.

What is the maximum operating junction temperature?

The maximum operating temperature is +125°C for the IUHG variant.