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Product Detailed Parameters
- Description：60V SYNCHRONOUS 4-SWITCH BUCK-BO
- 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：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：4V ~ 60V
- Frequency - Switching：645kHz ~ 2.1MHz
- Duty Cycle (Max)：95%
- Synchronous Rectifier：Yes
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Current Limit, Frequency Control, Soft Start
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：28-WFQFN Exposed Pad
- Supplier Device Package：28-QFN (4x5)
- Grade：-
- Qualification：-
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Overview
The LT8390AHUFD#PBF is a synchronous four-switch buck-boost DC/DC controller manufactured by Analog Devices Inc. It operates within an input voltage range of 4 V to 60 V and supports output voltages from 0 V to 60 V. The device features an adjustable switching frequency between 600 kHz and 2 MHz, with a maximum static current of 2.1 mA. It utilizes a QFN-28 package and functions across a temperature range of -40°C to +150°C.
Feature Summary
- Synchronous four-switch topology enables regulation when input voltage is above, below, or equal to the output voltage.
- Integrated pass-thru capability eliminates switching noise during direct battery connection applications.
- Supports clock synchronization for multi-phase operation and system-wide noise reduction.
Applications
- Solar panel to battery charger systems
- Automotive infotainment and lighting power supplies
- Industrial motor drives and PLC power management
Procurement Notes
Verify the specific suffix 'HUFD' against the official datasheet to confirm the extended high-temperature rating (+150°C) compared to standard variants. Ensure RoHS compliance documentation matches the '#PBF' designation. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components, as supply availability may be restricted in certain regions.
Selection Notes
Select this component when input voltage fluctuates significantly around the target output level. The wide input range accommodates single-cell lithium-ion batteries or automotive loads. Consider the thermal performance of the exposed pad in the QFN-28 package for high-power designs. Verify that the required switching frequency aligns with external inductor selection constraints.
Part Context
This part belongs to the LT8390 family of synchronous buck-boost controllers. It shares the core architecture with variants like LT8390AIUFD#PBF but differs in temperature grading. The HUFD suffix indicates an industrial/high-temperature grade suitable for harsh environments where standard commercial parts may fail.
Replacement Considerations
LT8390AIUFD#PBF offers similar functionality but is rated for a maximum operating temperature of +125°C instead of +150°C. LT8390EUFD is another variant within the same series. Substitution requires verifying thermal requirements and ensuring pinout compatibility remains identical across the family.
FAQ
What is the purpose of the pass-thru mode?
Pass-thru mode allows the controller to bypass switching when the input voltage equals the output voltage, thereby eliminating switching noise and improving efficiency in battery-connected applications.
How does the four-switch topology benefit design?
It allows continuous current flow regardless of whether the input voltage is higher, lower, or equal to the output voltage, simplifying design for variable input sources like solar panels or batteries.
