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Product Detailed Parameters
- Description：IC REGULATOR
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- 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
- Mounting Type：Surface Mount
- Package / Case：28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Supplier Device Package：28-TSSOP-EP
- Grade：-
- Qualification：-
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Overview
The LT3840EFE is a high voltage synchronous step-down switching regulator controller from Analog Devices, designed for wide input range applications. It operates with an input voltage of 2.5V to 60V and supports output voltages from 1.25V to 60V. The device delivers up to 20A of output current with a fixed switching frequency of 1MHz. Key electrical parameters include a low quiescent current of 6µA and a shutdown supply current of 20µA. It features accurate current limiting and is housed in a 28-TSSOP package with an exposed pad. The component is rated for operation between -55°C and +150°C junction temperature.
Feature Summary
- Synchronous buck topology with integrated accurate current limit
- Wide input voltage range supporting 2.5V to 60V supplies
- Low quiescent current for improved efficiency at light loads
Applications
- Industrial power supplies
- Telecommunications equipment
- Point-of-load conversion
Procurement Notes
Verify the specific suffix (EFE#PBF) against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with external MOSFETs for the 20A current requirement. Check for obsolescence status as some variants may be discontinued. Confirm lead times and availability through authorized distributors only.
Selection Notes
Select this controller for high-voltage input systems requiring precise current management. The 1MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider thermal performance due to the exposed pad design. Verify that the 60V maximum input rating aligns with system transients.
Part Context
The LT3840 belongs to Analog Devices' family of high-voltage synchronous regulators. It complements other controllers like the LT3840MPFE by offering standard commercial/industrial temperature ranges in a TSSOP package. It serves as a core component for designing efficient DC-DC converters in demanding environments.
Replacement Considerations
LT3840MPFE#PBF is a verified military-grade equivalent with extended temperature range (-55°C to +150°C). Direct substitutes should maintain the 2.5V-60V input range and 1MHz switching frequency. Cross-reference pinouts and control logic before replacement.
