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Product Detailed Parameters
- Description：IC REG CTRLR BUCK-BOOST 38TSSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- 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#TRPBF 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 from 1.3V to 80V. The device delivers up to 10A of output current through two phases. It features a fixed switching frequency of 400kHz, though programmable synchronization is available. The quiescent current is specified at 2.65mA. Operating temperature range extends from -40°C to +150°C junction temperature. The component is housed in a 38-TSSOP-EP package with an exposed pad for thermal management.
Feature Summary
- Synchronous four-switch topology enabling seamless transition between buck, boost, and pass-through modes regardless of input-output voltage relationships.
- Integrated clock synchronization capability allows multiple controllers to be phase-aligned or dithered for EMI reduction.
- Comprehensive protection features including over-current protection, thermal shutdown, and soft-start functionality.
Applications
- Industrial distributed power bus architectures
- Telecommunications voltage stabilization systems
- Battery-powered equipment requiring wide input ranges
Procurement Notes
Verify the suffix #TRPBF confirms tape-and-reel packaging when ordering. Confirm the AHFE grade matches required thermal and electrical specifications against the official datasheet. Ensure the 38-TSSOP-EP footprint aligns with PCB design constraints. Cross-reference the manufacturer part number directly with Analog Devices documentation to avoid counterfeit components.
Selection Notes
Select this controller for applications requiring high efficiency across wide input-output differentials. Consider the 400kHz fixed frequency for standard filtering requirements. Evaluate thermal performance given the 150°C junction limit. Compare against non-synchronous alternatives if cost is critical, noting that this device integrates external MOSFET drivers.
Part Context
This component belongs to the LT8705 family of high-performance buck-boost switching regulator controllers. The LT8705A variant offers enhanced specifications compared to the base LT8705 model. These devices are designed for robust power management in demanding industrial and telecom environments where input voltage fluctuates significantly relative to the load requirement.
Replacement Considerations
LT8705EFE#TRPBF serves as a direct functional substitute within the same product family. Verify pinout compatibility and thermal characteristics before substitution. Other members of the LT8705 series may offer similar topologies but differ in specific electrical ratings or package options.
