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Product Detailed Parameters
- Description：IC REG BUCK ADJ 3A 10DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：0.782V
- Voltage - Output (Max)：42V
- Current - Output：3A
- Frequency - Switching：200kHz ~ 2.2MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount, Wettable Flank
- Package / Case：10-WFDFN Exposed Pad
- Supplier Device Package：10-DFN (3x3)
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Overview
The LT8609AJDDM-5#TRPBF is a synchronous step-down switching regulator from Analog Devices, designed for high-efficiency power conversion. It features a fixed 5V output with a continuous current capability of 3A and peak currents up to 2A/3A depending on conditions. The device accepts an input voltage range from 3V to 42V. Key electrical parameters include a low quiescent current of 2.5µA, adjustable switching frequencies between 200kHz and 2.2MHz, and operation over a temperature range of -40°C to +150°C junction temperature. It utilizes a compact 10-WFDFN package.
Feature Summary
- Synchronous buck topology ensures high efficiency across load ranges
- Ultra-low quiescent current minimizes standby power consumption
- Integrated soft-start limits inrush current during startup
- Compact DFN package facilitates space-constrained designs
Applications
- Industrial control systems requiring isolated or non-isolated DC-DC conversion
- Automotive electronics operating within wide voltage ranges
- Portable equipment powered by single-cell lithium-ion batteries
- Distributed power architectures in embedded systems
Procurement Notes
Verify the exact suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the AJ grade matches required automotive or industrial qualification standards. Ensure the fixed 5V output variant aligns with system voltage requirements, as other output voltages exist within the LT8609 family. Cross-reference pinout compatibility if replacing legacy components.
Selection Notes
Select this part when a fixed 5V rail is needed from a higher input bus up to 42V. Consider the 3A output limit against maximum load demands including transient spikes. Evaluate thermal performance based on PCB copper area and ambient conditions due to the small footprint. Compare switching frequency options against EMI constraints and external component size requirements.
Part Context
This component belongs to the LT8609 series of Silent Switcher regulators. It shares architectural similarities with other members like the LT8609AEDDM (adjustable output) but differs in fixed output configuration. The series emphasizes low EMI and high efficiency, targeting applications where noise sensitivity and power density are critical factors in modern electronic design.
Replacement Considerations
LT8609AEDDM#TRPBF offers adjustable output instead of fixed 5V. LT8609BIDDM variants may differ in specific electrical characteristics or grades. Verify pin-to-pin compatibility and thermal resistance values before substitution. Check datasheet revisions for any changes in recommended external component values.
