LT8708ELWE-1#PBF

Overview

The LT8708ELWE-1#PBF is an 80V synchronous four-switch buck-boost DC/DC controller designed as a slave device for paralleling with the primary LT8708 controller. It supports bidirectional energy transfer, allowing input voltage to be higher, lower, or equal to output voltage. The component operates within a switching frequency range of 100kHz to 400kHz and features a maximum duty cycle of 80%. It utilizes a 64-pin eLQFP (10x10mm) package with exposed pad. The supply voltage range spans from 2.8V to 80V, supporting robust performance in high-voltage applications requiring phase interleaving.

Feature Summary

• Serves as a slave controller for paralleling with the primary LT8708 to increase power capacity and add phases
• Supports bidirectional buck-boost conversion with input voltages exceeding, falling below, or matching output levels
• Enables independent current limiting and regulation modes for input and output sides

Applications

• High-power bidirectional charging systems
• Multi-phase DC/DC converter designs requiring increased current handling
• Humanoid robot joint power supplies
• Automotive 48V systems with regenerative braking capabilities

Procurement Notes

Verify that the specific suffix #PBF indicates lead-free compliance and tray packaging configuration. Confirm compatibility with the primary LT8708 master controller for proper phase interleaving operation. Ensure the design supports the required 64-pin eLQFP footprint and thermal requirements. Check for any recent product change notifications affecting pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when system power requirements exceed the capability of a single LT8708 controller. It is specifically intended for use in multi-phase configurations where the LT8708 acts as the master. Consider the 80V maximum rating and the need for external N-MOSFETs for the power stage. This part is suitable for applications demanding high efficiency through synchronous rectification and precise current sharing between parallel phases.

Part Context

The LT8708ELWE-1#PBF belongs to the LT8708 family of high-performance buck-boost controllers. While the standard LT8708 functions as the master controller, the -1 variant operates exclusively as a slave unit. This architecture allows designers to scale power delivery by paralleling multiple units. The component integrates advanced control logic to manage bidirectional flow and ensure stable operation across varying load and line conditions.

Replacement Considerations

No direct public substitute part numbers are confirmed for this specific slave controller function. The LT8708ELWE-1#PBF is designed to work exclusively with the LT8708 master. Alternative solutions would require redesigning the control architecture rather than simple pin-to-pin replacement.