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Product Detailed Parameters
- Description：80V SYNCHRONOUS 4-SWITCH BUCK-BO
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive
- Topology：Buck-Boost
- Number of Outputs：1
- Output Phases：2
- Voltage - Supply (Vcc/Vdd)：2.8V ~ 80V
- Frequency - Switching：100kHz ~ 400kHz
- Duty Cycle (Max)：80%
- Synchronous Rectifier：Yes
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：-
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：40-WFQFN Exposed Pad
- Supplier Device Package：40-QFN (5x8)
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Overview
The LT8708EUHG#PBF is an Analog Devices synchronous four-switch buck-boost DC/DC controller designed for bidirectional power applications. It supports input voltages from 2.8V to 80V and output voltages from 1.3V to 80V, accommodating scenarios where VIN is higher, lower, or equal to VOUT. The device features a maximum switching frequency of 400kHz and typical output current capability of 15A. Operating within a temperature range of -40°C to +125°C, it utilizes a 40-pin QFN (5mm × 8mm) package with exposed pad. Key electrical specifications include up to 99% synchronous rectification efficiency and support for DCM, CCM, HCM, and Burst Mode operation.
Feature Summary
- Bidirectional power transfer capability allowing energy flow between input and output ports
- Six independent regulation modes for precise control of VIN, VOUT, and forward/reverse currents
- Flexible conduction mode selection including discontinuous, continuous, hybrid, and burst modes
- High integration in compact QFN package with high-voltage pin spacing for safety
Applications
- Automotive 48V systems
- Battery and capacitor backup systems
- Humanoid robot dual-battery energy storage
- Servo braking energy recovery
- Multi-voltage rail bidirectional conversion
Procurement Notes
Verify the specific suffix #PBF indicates lead-free RoHS compliance when ordering. Confirm that the EUHG variant meets the required industrial temperature range of -40°C to +125°C for your application environment. Ensure external components such as MOSFETs and inductors are rated for the 80V system voltage. Check availability status as supply constraints may affect delivery schedules for this component.
Selection Notes
Select the LT8708EUHG#PBF for industrial applications requiring robust bidirectional buck-boost control. Choose the HUHG variant if the operating environment exceeds 125°C, as it supports temperatures up to 150°C. Consider the eLQFP package option if surface mount area constraints favor a larger footprint over the standard QFN form factor. Evaluate the need for six independent regulation loops against simpler single-loop requirements to optimize design complexity.
Part Context
This component belongs to the LT8708 series of high-performance buck-boost controllers from Analog Devices. The series includes variants like LT8708IUHG and LT8708HUHG, differentiated primarily by temperature ratings and minor testing specifications. All models share the same core topology and functionality, supporting AEC-Q100 automotive certification standards for reliability in harsh environments.
Replacement Considerations
Direct substitutes within the same family include LT8708IUHG and LT8708HUHG. Note that these variants differ in maximum operating temperature rather than electrical performance. No cross-family replacements are officially documented; alternative designs require separate validation.
