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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
- 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 LT8705AHFE#PBF is a high-performance synchronous four-switch buck-boost DC/DC controller manufactured by Analog Devices Inc. It operates with input voltages ranging from 4.2V to 80V and supports output voltages up to 80V, allowing for operation above, below, or equal to the input voltage. The device features an integrated 80V supply pin that eliminates the need for external bootstrap circuits. It supports switching frequencies from 100kHz to 400kHz and includes clock synchronization capabilities. The controller provides two independent output phases with positive output configuration.
Feature Summary
- Synchronous four-switch buck-boost topology supporting continuous conduction mode
- Integrated 80V supply pin eliminating external bootstrap requirements
- Clock synchronization capability for multi-phase or parallel operation
- Comprehensive protection features including over-voltage, under-voltage, and thermal shutdown
Applications
- Industrial automation systems requiring wide input voltage ranges
- Telecommunications infrastructure power supplies
- Distributed power systems in server racks
- Battery-powered equipment with varying charge states
Procurement Notes
Verify the specific suffix 'PBF' indicates lead-free packaging compliant with RoHS standards. Confirm the package type matches the required PCB footprint, which is a 38-lead TSSOP with exposed pad. Ensure the ordering information aligns with the exact temperature grade and performance specifications documented in the official Analog Devices datasheet before finalizing procurement orders.
Selection Notes
Select this component when designing systems requiring seamless transition between buck and boost modes without discontinuous current. Consider the 80V maximum rating for both input and output nodes. Evaluate the switching frequency range against EMI requirements and inductor size constraints. Verify compatibility with external MOSFET gate drive requirements and ensure adequate thermal management for the TSSOP-EP package.
Part Context
This part belongs to the LT8705 family of buck-boost controllers designed for high-efficiency power conversion. It complements other Analog Devices PMIC solutions by offering a robust architecture for applications where input voltage fluctuates significantly around the output voltage level. The family emphasizes reliability and ease of implementation in demanding industrial environments.
Replacement Considerations
Direct substitutes include the LT8705EFE#PBF and LT8705AEFE#TRPBF within the same product family. Verify functional equivalence regarding electrical parameters and pinout compatibility. Note that different suffixes may indicate variations in packaging (tube vs. tape and reel) or specific performance grades, but core functionality remains consistent across the LT8705 series.
