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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 LT8640EUDC#PBF is a synchronous buck switching regulator from Analog Devices, featuring Silent Switcher architecture for ultra-low EMI radiation. It supports an input voltage range of 3.4V to 42V and delivers up to 5A continuous output current with 7A peak transient capability. The device offers adjustable switching frequencies from 200kHz to 3MHz and achieves efficiencies up to 96% at 1MHz. Key electrical parameters include a minimum top switch conduction time of 30ns, a quiescent current of 2.5μA in burst mode operation, and an output voltage range of 970mV to 41.9V.
Feature Summary
- Silent Switcher architecture minimizes electromagnetic interference without requiring external filters.
- Ultra-low static current enables high efficiency under very light load conditions.
- Fast minimum top switch conduction time allows efficient conversion from high input to low output voltages.
- Selectable operating modes include Burst Mode, spread spectrum frequency modulation, and forced continuous mode.
Applications
- Automotive always-on systems and battery-powered applications
- Industrial power supplies and distributed DC power systems
- GSM base station power distribution
- General-purpose step-down regulation for embedded electronics
Procurement Notes
Verify the specific suffix against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with required thermal management solutions for the QFN-18 package. Cross-reference datasheet revisions to validate pinout consistency and electrical characteristics prior to integration into final designs.
Selection Notes
Select this component when low electromagnetic interference is critical alongside high efficiency requirements. The wide input voltage range accommodates various automotive and industrial sources. Consider the available operating modes to optimize performance for specific load profiles and noise sensitivity constraints within the target application environment.
Part Context
This part belongs to the LT8640 family of synchronous buck regulators designed for compact, high-performance power solutions. The series integrates power switches and control circuitry to reduce external component count. It is engineered for applications demanding small form factors while maintaining robust electrical performance across wide operating temperature ranges.
Replacement Considerations
LT8640IUDC#PBF: Same topology with different temperature grade. LT8640EUDCF-1#PBF: Variant with fixed output configuration options. LT8640S Series: Second-generation Silent Switcher architecture with higher current capabilities.
