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Product Detailed Parameters
- Description：IC REG CTRLR BUCK-BOOST 38TSSOP
- 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 ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Supplier Device Package：38-TSSOP-EP
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Overview
The LT8705HFE#PBF is a synchronous four-switch buck-boost DC/DC controller from Analog Devices. It operates with input voltages ranging from 2.8V to 80V and supports output voltages up to 80V. The device features a fixed switching frequency of 400kHz, though it is programmable down to 100kHz. It delivers up to 10A of output current with a quiescent current of 2.65mA. Operating within a temperature range of -40°C to +125°C, it utilizes a 38-TSSOP-EP package for surface-mount installation.
Feature Summary
- Synchronous four-switch topology enabling seamless transition between buck, boost, and pass-through modes
- Wide input voltage range supporting operation above, below, or equal to the output voltage
- Integrated clock synchronization capability for multi-phase or parallel system applications
- Comprehensive control features including soft-start, enable pin, and frequency control
Applications
- Industrial distributed power systems requiring wide input ranges
- Battery-powered equipment operating across varying charge states
- Automotive electronics subject to load dump and cold crank conditions
- Telecom infrastructure power supplies
Procurement Notes
Verify component authenticity through authorized Analog Devices distributors. Confirm RoHS compliance status via official documentation. Check for recent Production Change Notices regarding epoxy or bond wire modifications. Ensure storage conditions meet manufacturer specifications to maintain reliability.
Selection Notes
Select this controller for applications demanding high efficiency across wide input-output differentials. Consider the 38-pin TSSOP package for thermal management requirements. Evaluate the 400kHz default frequency against EMI constraints. Ensure external component selection aligns with the 10A current capability and 80V voltage ratings.
Part Context
This part belongs to the LT8705 family of high-performance buck-boost controllers. It shares functional similarities with variants like the LT8705EFE#PBF but differs in package type. The HFE suffix denotes the 38-TSSOP-EP package configuration suitable for surface-mount assembly.
Replacement Considerations
Direct substitutes include other LT8705 variants such as LT8705EFE#PBF or LT8705MPFE#PBF, provided package compatibility is addressed. Verify that alternative packages support identical electrical parameters and thermal performance.
