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Product Detailed Parameters
- Description：IC REG BUCK ADJ 5A 20QFN
- Series：Silent Switcher®1
- Mfr：Analog Devices Inc.
- Package：Tube
- 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)：42V
- Current - Output：5A
- Frequency - Switching：210kHz ~ 2MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：20-WFQFN, 18 Leads, Exposed Pad
- Supplier Device Package：20-QFN (3x4)
- Grade：-
- Qualification：-
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Overview
The LT8640IUDC-1#PBF is a synchronous step-down Silent Switcher regulator from Analog Devices, housed in an 18-lead QFN package. It supports input voltages from 3.4 V to 42 V and delivers up to 5 A of output current. The adjustable output voltage ranges from 970 mV to 41.9 V. Operating frequencies span 200 kHz to 3 MHz with a quiescent current of 1.7 uA. The device functions within a temperature range of -40°C to +125°C.
Feature Summary
- Integrates Silent Switcher technology to minimize electromagnetic interference without requiring external ferrite beads or complex layout techniques.
- Features a wide input voltage range suitable for industrial and automotive power distribution systems.
- Includes integrated soft-start functionality to limit inrush current during startup sequences.
Applications
- Industrial automation controllers
- Automotive infotainment and sensor modules
- Distributed power supply architectures
Procurement Notes
Verify the specific suffix against official datasheets to confirm thermal grade and packaging type. Confirm RoHS compliance status directly with the manufacturer documentation. Ensure the ordering part number matches the required lead frame finish and tape-and-reel specifications if applicable.
Selection Notes
Select this component when high efficiency and low EMI are critical in space-constrained designs. The wide input range accommodates various bus voltages. Evaluate thermal performance requirements based on the QFN package's exposed pad capabilities and expected load conditions.
Part Context
This part belongs to the LT8640 family of Silent Switcher regulators. It shares architectural similarities with other members like the LT8640EUDC-1 but differs in thermal characteristics and maximum operating temperature ratings defined by the 'I' designation.
Replacement Considerations
LT8640EUDC-1#PBF offers similar electrical parameters but may differ in thermal handling capabilities. Verify pinout compatibility and ensure the replacement meets the specific temperature grade requirements of the target application.
