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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-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Supplier Device Package：38-TSSOP-EP
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Overview
The LT8705HFE is a synchronous four-switch buck-boost switching regulator controller from Analog Devices. It operates with input voltages ranging from 2.8 V to 80 V and provides adjustable output voltages from 1.3 V to 80 V. The device supports up to 10 A of output current and features a fixed switching frequency of 400 kHz. Quiescent current is specified at 2.65 mA. It functions in TSSOP-EP-38 packages, supporting temperatures between -40°C and +150°C.
Feature Summary
- Synchronous four-switch topology enabling operation above, below, or equal to the output voltage
- Wide input voltage range accommodating 2.8 V to 80 V sources
- Integrated shutdown capability for power management efficiency
Applications
- Supercapacitor backup power systems
- Battery-powered devices with varying cell counts
- Industrial control systems requiring wide input ranges
Procurement Notes
Verify the specific suffix #PBF against official Analog Devices documentation to confirm lead-free compliance and tape-and-reel packaging specifications. Ensure the TSSOP-EP-38 package variant matches the thermal pad requirements of the target PCB layout. Cross-reference the datasheet revision date to confirm compatibility with existing design parameters.
Selection Notes
Select this component when input voltage fluctuates significantly around the nominal output level. The synchronous buck-boost architecture minimizes external component count compared to discrete solutions. Evaluate thermal performance due to the high current capability and ensure adequate heat dissipation through the exposed pad in the TSSOP-EP-38 package.
Part Context
This part belongs to the LT8705 family of high-performance buck-boost controllers. It is designed for applications requiring seamless transition between buck and boost modes without mode switching delays. The HFE suffix indicates a specific temperature grade and package configuration within the broader product line.
Replacement Considerations
LT8705IFE is a documented alternative within the same family offering similar electrical characteristics. Verify pinout compatibility and thermal performance differences before substitution. Consult official Analog Devices cross-reference guides for confirmed equivalent parts.
