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Product Detailed Parameters
- Description：IC REG CTRLR BUCK-BOOST 38QFN
- 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：2
- Output Phases：2
- Voltage - Supply (Vcc/Vdd)：2.8V ~ 80V
- Frequency - Switching：100kHz ~ 400kHz
- Duty Cycle (Max)：-
- Synchronous Rectifier：Yes
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Enable, Frequency Control, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：38-WFQFN Exposed Pad
- Supplier Device Package：38-QFN (5x7)
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Overview
The LT8705IUHF#PBF is a synchronous buck-boost DC/DC controller from Analog Devices Inc., designed for high-performance power management. It supports input voltages ranging from 2.8V to 80V and delivers up to 10A output current with an adjustable output voltage range of 1.3V to 80V. The device operates at a switching frequency of 400kHz, with a quiescent current of 2.65mA. It features clock synchronization and soft-start capabilities, functioning within a temperature range of -40°C to +125°C. Packaged in a 38-QFN (5x7) surface-mount format, it integrates enable, frequency control, and shutdown functions.
Feature Summary
- Synchronous four-switch buck-boost topology supporting input voltages above, below, or equal to the output voltage
- Clock synchronization capability for multi-phase or parallel system operation
- Integrated soft-start function to limit inrush current during startup
Applications
- Telecom voltage stabilization systems
- Industrial distributed power architectures
- Automotive electronics requiring wide input voltage ranges
Procurement Notes
Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm RoHS compliance status via official documentation. Ensure storage conditions adhere to moisture sensitivity levels specified in the datasheet. Validate package integrity upon receipt to prevent damage to the QFN thermal pad. Cross-reference ordering suffixes to ensure exact functional equivalence.
Selection Notes
Select this controller for applications requiring seamless transition between buck and boost modes without discontinuous conduction issues. Consider the 38-QFN package for compact designs needing efficient thermal dissipation. Evaluate the 400kHz switching frequency against EMI constraints and inductor size requirements. Ensure external components support the 80V maximum rating for both input and output nodes.
Part Context
The LT8705 series represents Analog Devices' solution for complex power conversion needs where input and output voltages vary significantly. The IUHF#PBF variant specifically denotes the industrial grade version in a tube package. It belongs to the broader LT8705 family, sharing core architecture with other variants differentiated by temperature grades and packaging options.
Replacement Considerations
LT8705AIUHF#PBF: Industrial grade alternative with potentially different electrical characteristics; verify parameter compatibility before substitution.
