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Product Detailed Parameters
- Description：IC REG BUCK ADJ 4A 26QFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3.9V
- Voltage - Input (Max)：36V
- Voltage - Output (Min/Fixed)：0.8V
- Voltage - Output (Max)：20V
- Current - Output：4A
- Frequency - Switching：138kHz ~ 1.5MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：26-WFQFN Exposed Pad
- Supplier Device Package：26-QFN (4x6)
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Overview
The LT3690IUFE#PBF is an automotive-grade, adjustable frequency monolithic synchronous step-down switching regulator manufactured by Analog Devices Inc. It accepts input voltages ranging from 3.9V to 36V and provides a single adjustable output voltage between 0.8V and 20V with a maximum output current of 4A. The device operates at a switching frequency up to 1.5MHz and features a typical quiescent current of 70µA. It utilizes a QFN-26 package with an exposed pad for thermal management and supports operation temperatures from -40°C to +150°C.
Feature Summary
- Integrates high-efficiency internal synchronous power switches to eliminate the need for external catch diodes
- Features adjustable switching frequency capability to optimize design trade-offs between efficiency and component size
- Includes comprehensive protection mechanisms such as cycle-by-cycle current limiting and thermal shutdown
Applications
- Automotive always-on systems requiring wide input voltage ranges
- Battery-powered digital devices needing extended operating run time
- Distributed DC power systems in industrial environments
Procurement Notes
Verify the specific suffix 'I' indicates the industrial temperature grade extension compared to standard variants. Confirm the '#PBF' designation ensures lead-free compliance and RoHS adherence. Cross-reference the exact part number against the manufacturer's latest datasheet to ensure availability status and pinout compatibility before finalizing procurement plans.
Selection Notes
Select this component when designing systems that require high efficiency within a compact footprint while supporting automotive-grade reliability standards. The adjustable frequency feature allows designers to tailor the switching speed to minimize electromagnetic interference or reduce passive component sizes. Ensure the input voltage range aligns with the system's power source capabilities.
Part Context
This part belongs to the LT3690 series of synchronous buck regulators designed for demanding applications. It shares architectural similarities with other high-performance power management ICs from Analog Devices but is specifically optimized for automotive and industrial use cases requiring robust performance under varying thermal conditions.
Replacement Considerations
Consult official documentation for direct pin-compatible substitutes within the same product family. Verify functional equivalence regarding switching topology and control logic before considering alternative manufacturers.
