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Product Detailed Parameters
- Description：42V, 6A SYNCHRONOUS STEP-DOWN SI
- Series：Silent Switcher®2
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3.4V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：0.97V
- Voltage - Output (Max)：41.5V
- Current - Output：6A
- Frequency - Switching：200kHz ~ 3MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：24-TFQFN Exposed Pad
- Supplier Device Package：24-LQFN (4x4)
- Grade：-
- Qualification：-
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Overview
The LT8643SAAV#TRPBF is a synchronous step-down Silent Switcher 2 regulator from Analog Devices, designed for high-efficiency power conversion. It features an input voltage range of 3.4 V to 42 V and delivers up to 6 A of output current. The device supports adjustable switching frequencies between 200 kHz and 3 MHz, enabling optimization for size and performance. It operates within a temperature range of -40°C to +125°C and includes integrated soft-start and overcurrent protection. Packaged in a 24-lead LQFN with exposed pad for superior thermal dissipation, it utilizes external compensation for flexible loop stability.
Feature Summary
- Integrates Silent Switcher 2 architecture for minimized electromagnetic interference radiation without requiring external filters.
- Supports wide input voltage ranges suitable for industrial and automotive bus architectures.
- Incorporates internal soft-start functionality to limit inrush current during startup sequences.
- Features adjustable switching frequency to optimize the trade-off between efficiency and passive component size.
Applications
- Industrial automation control systems
- Distributed power supply architectures
- Point-of-load regulation for processors and FPGAs
- Automotive electronics and infotainment systems
Procurement Notes
Verify the specific suffix AV against the manufacturer's official datasheet to confirm pinout compatibility and thermal pad configuration. Ensure the selected package variant matches the PCB footprint requirements. Confirm that external compensation components are properly rated for the target operating conditions. Validate RoHS compliance status through the latest documentation before final integration.
Selection Notes
Select this component when high current density and low EMI are critical requirements. The external compensation feature allows customization of the control loop for specific load transient responses. Consider the thermal performance of the LQFN package relative to the expected ambient temperature and airflow conditions in the final enclosure design.
Part Context
This part belongs to the LT8643S family of Silent Switcher 2 regulators, which are engineered to address EMI challenges in compact designs. The series offers various packages and current ratings to suit different power levels. The LT8643SAAV#TRPBF specifically provides a robust solution for applications demanding high efficiency and strict noise limits.
Replacement Considerations
LT8643SEV-2#PBF is a documented parameter-equivalent alternative within the same product family. Verify pin-to-pin compatibility and thermal characteristics before substitution. Ensure that the replacement part meets all original electrical specifications and environmental ratings.
