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Product Detailed Parameters
- Description：IC REG BUCK
- 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
- Mounting Type：Surface Mount
- Package / Case：38-WFQFN Exposed Pad
- Supplier Device Package：38-QFN (5x7)
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Overview
The LT8705EUHF is a high-performance buck-boost switching regulator controller from Analog Devices Inc., designed for applications requiring input voltages above, below, or equal to the output voltage. It operates within a wide input range of 2.8V to 80V and supports switching frequencies from 100kHz to 400kHz. The device features integrated feedback loops for input current, input voltage, output current, and output voltage regulation. It provides dual outputs with phase control capabilities and maintains a quiescent current of 2.65mA. The component functions reliably across an operating temperature range of -40°C to +125°C.
Feature Summary
- Supports buck, boost, and buck-boost topologies with input voltages exceeding, falling below, or matching the output voltage
- Integrates closed-loop control for input current, input voltage, output current, and output voltage
- Enables dual-output configurations with precise phase control functionality
Applications
- Photovoltaic inverter systems
- Battery pack management circuits
- Industrial multi-output power systems
Procurement Notes
Verify the specific suffix (e.g., #PBF for tube packaging) against project requirements. Confirm that the QFN-38 package dimensions match the PCB footprint. Ensure the supplier provides traceability documentation for industrial-grade components. Cross-reference the datasheet revision date with manufacturing batch codes to guarantee performance consistency.
Selection Notes
Select this controller when input voltage fluctuates significantly relative to the required output level. It is suitable for designs demanding tight regulation across multiple feedback parameters. Consider the 38-pin QFN package for thermal management needs. Evaluate the 100kHz to 400kHz frequency range against electromagnetic interference constraints and passive component sizing requirements.
Part Context
This component belongs to the LT8705 family of DC-DC switching controllers manufactured by Analog Devices Inc. It is categorized under PMIC - Voltage Regulators - DC DC Switching Controllers. The EUHF variant specifically denotes the lead-free, halogen-free QFN-38 package option, distinguishing it from TSSOP-38 alternatives like the LT8705EFE.
Replacement Considerations
Public confirmed substitutes include LT8705EFE#PBF and LT8705AIFE#PBF. Verify pin compatibility and thermal pad specifications when transitioning between QFN and TSSOP packages. Review control loop compensation requirements as internal architecture may differ slightly between variants.
