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Product Detailed Parameters
- Description：80V SYNCHRONOUS 4-SWITCH BUCK-BO
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- 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#TRPBF is a non-isolated synchronous four-switch buck-boost DC/DC controller manufactured by Analog Devices Inc. It operates within an input voltage range of 2.8 V to 80 V and supports switching frequencies up to 400 kHz. The device features a maximum duty cycle of 80% with rise and fall times of 20 ns. Designed for surface-mount installation, it utilizes a 40-QFN (5x8) package. The component is qualified under AEC-Q100 standards and functions reliably across an operating temperature range from -40°C to +125°C.
Feature Summary
- Synchronous four-switch buck-boost topology for continuous current flow
- Clock synchronization capability for multi-phase or parallel operation
- AEC-Q100 automotive qualification ensuring reliability in harsh environments
- Integrated shutdown function for power management control
Applications
- Automotive battery management systems
- Industrial motor drives requiring wide input voltage ranges
- Telecommunications infrastructure power supplies
- Portable equipment with single-cell lithium-ion batteries
Procurement Notes
Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the IUHG variant meets the required industrial temperature specifications (-40°C to +125°C). Ensure compatibility with the 40-QFN footprint during PCB layout. Cross-reference the datasheet revision to confirm pinout consistency, as manufacturing changes may occur over time.
Selection Notes
Select this controller for applications demanding high efficiency across wide input-to-output voltage differentials. The synchronous design reduces external component count compared to traditional topologies. Consider the 400 kHz switching frequency trade-off between size and thermal performance. Verify that the external MOSFETs selected can handle the peak currents associated with the buck-boost mode without exceeding thermal limits.
Part Context
This component belongs to the LT8708 family of power management ICs designed for high-voltage buck-boost applications. It serves as a core controller for converting voltages in systems where the input may be higher, lower, or equal to the output. The family includes variants with different temperature ratings and packaging options to suit diverse industrial and automotive needs.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Direct replacement requires matching the 40-QFN package, 80V rating, and synchronous buck-boost functionality. Evaluate alternative controllers only if they offer identical pinouts and electrical characteristics to ensure board-level compatibility.
