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Product Detailed Parameters
- Description：IC REG CTRLR BUCK-BOOST 38QFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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#TRPBF is a synchronous four-switch buck-boost DC/DC controller from Analog Devices Inc., housed in a 38-QFN (5x7) package. It supports an input voltage range of 2.8V to 80V and delivers up to 10A output current with a regulated output voltage between 1.3V and 80V. The device operates at a switching frequency of 400kHz, drawing a quiescent current of 2.65mA. It functions across a temperature range of -40°C to +125°C TJ.
Feature Summary
- Synchronous four-switch topology enabling continuous buck, boost, or buck-boost operation regardless of input versus output voltage relationships.
- Integrated feedback loops for precise regulation of input current, input voltage, output current, and output voltage.
- Clock synchronization capability allows multiple units to be phase-aligned to reduce system-wide ripple.
- Comprehensive control features including soft-start, frequency control, and shutdown functionality.
Applications
- Supercapacitor backup power systems requiring stable voltage during charge and discharge cycles.
- Telecom voltage stabilizers operating within wide input voltage ranges.
- Industrial DC-DC conversion applications involving battery sources or variable supply rails.
- Distributed power architectures needing high efficiency across varying load conditions.
Procurement Notes
Verify the specific suffix TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the part number matches the exact manufacturer designation from Analog Devices Inc. documentation. Ensure compatibility with the required thermal management solutions for the QFN package. Check for any recent lifecycle status updates regarding availability or obsolescence directly from official channels.
Selection Notes
Select this controller for designs requiring seamless transition between buck and boost modes without discontinuity. Consider the 400kHz switching frequency for balancing component size and efficiency. Evaluate the need for external MOSFETs compatible with the driver outputs. Assess thermal performance requirements based on the 10A current capability and ambient operating conditions.
Part Context
The LT8705 series represents a family of high-performance buck-boost controllers designed for demanding power management tasks. The IUHF variant specifically denotes the industrial temperature grade and QFN package configuration. This component addresses applications where input voltages fluctuate significantly around the target output level, ensuring stable power delivery.
Replacement Considerations
Direct substitutes include other LT8705 variants such as LT8705EUHF#PBF or LT8705MPFE#PBF, which share the same core functionality but may differ in package type or temperature rating. Verify pinout compatibility and electrical specifications before substitution.
