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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 38QFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Transistor Driver
- Function：Step-Down
- Output Configuration：Positive or Negative
- Topology：Buck
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：2.5V ~ 60V
- Frequency - Switching：50kHz ~ 1MHz
- Duty Cycle (Max)：99%
- Synchronous Rectifier：Yes
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：38-WFQFN Exposed Pad
- Supplier Device Package：38-QFN (4x6)
- Grade：-
- Qualification：-
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Overview
The LT3840EUFE#TRPBF is a high voltage synchronous step-down switching regulator controller from Analog Devices Inc. It operates from an input supply of 2.5V to 60V and supports up to 20A output current. The device features a programmable switching frequency ranging from 50kHz to 1MHz, with a typical operating point at 1MHz. It utilizes a QFN-38 package and includes shutdown functionality. The quiescent current is specified at 20uA. This component is designed for non-isolated buck applications within a temperature range of -40°C to +125°C.
Feature Summary
- Synchronous buck topology controller capable of handling wide input voltage ranges up to 60V
- Integrated accurate current limit mechanism for precise load protection
- Programmable switching frequency allows optimization for efficiency or size
- Low quiescent current operation enhances system efficiency in standby modes
Applications
- Industrial power supplies requiring high voltage inputs
- Distributed power architectures in telecom equipment
- Point-of-load regulation for high-power processors
- Automotive electronics systems
Procurement Notes
Verify the specific suffix TRPBF indicates tape and reel packaging when ordering. Confirm the QFN-38 package dimensions match your PCB footprint requirements. Ensure the thermal pad connection is properly designed for heat dissipation given the 20A capability. Check for RoHS compliance status if required by your manufacturing standards. Validate that the 1MHz switching frequency aligns with your EMI constraints.
Selection Notes
Select this controller when input voltages exceed standard 48V limits but remain below 60V. Consider the 20A current capability for heavy load applications. Evaluate the need for external MOSFETs as this is a controller, not an integrated switch. Compare against lower voltage variants if input sources are strictly limited to 24V or less. Assess thermal management needs due to the high current density in the QFN-38 package.
Part Context
The LT3840 series represents Analog Devices' solution for high-voltage DC-DC conversion. The EUFE variant denotes the commercial temperature grade version. It belongs to the broader family of synchronous buck controllers designed for robust industrial performance. The part is often evaluated using demo boards like the DC1909A to verify circuit design before mass production.
Replacement Considerations
LT3840IUFE#TRPBF offers the same electrical specifications but is rated for the extended industrial temperature range (-40°C to +125°C) compared to the commercial grade EUFE variant. LT3840MPFE#PBF provides military-grade reliability and testing. Direct pin-compatible substitutes within the same family maintain functional equivalence while altering environmental ratings.
