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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 LT8708IUHG#PBF is a synchronous four-switch buck-boost DC/DC controller from Analog Devices. It supports bidirectional energy transfer with an input voltage range of 2.8V to 80V and an output voltage range of 1.3V to 80V. The device operates at switching frequencies up to 400 kHz and delivers output currents up to 15A. It features six independent regulation modes, including VIN/VOUT current and voltage control. Packaged in a 40-pin QFN (5mm × 8mm), it functions within a temperature range of -40°C to +125°C.
Feature Summary
- Supports bidirectional energy transfer with single-inductor design for VIN above, below, or equal to VOUT
- Provides six independent regulation modes for precise control of input/output currents and voltages
- Enables dynamic mode and direction switching during operation via MODE and DIR pins
- Integrates high-efficiency synchronous rectification architecture
Applications
- Humanoid robot joint power systems
- Servo braking energy recovery
- Automotive 48V systems
- Bidirectional charging systems
Procurement Notes
Verify the specific suffix '#PBF' indicates lead-free compliance and tube packaging when ordering. Confirm that the 'IUHG' designation corresponds to the required industrial temperature grade (-40°C to +125°C). Ensure the 40-QFN package dimensions match the PCB footprint requirements. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.
Selection Notes
Select this component for applications requiring high-voltage bidirectional conversion between 2.8V and 80V inputs. It is suitable where space constraints favor a compact 40-QFN package over larger alternatives. Choose this part if independent control of forward and reverse currents is necessary. Consider the 400 kHz switching frequency for balancing efficiency and component size.
Part Context
This part belongs to the LT8708 series of high-performance buck-boost controllers. It shares core functionality with variants like the LT8708EUHG and LT8708HUHG, differing primarily in temperature ratings and automotive qualification status. The series is designed for complex power management tasks involving multiple voltage rails and energy regeneration.
Replacement Considerations
LT8708EUHG-1#PBF and LT8708HUHG-1#PBF are confirmed substitutes within the same family. Verify that the replacement variant meets the specific thermal and reliability requirements of the target application before substitution.
