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Product Detailed Parameters
- Description：IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck, SEPIC
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：5V
- Voltage - Input (Max)：25V
- Voltage - Output (Min/Fixed)：2.42V
- Voltage - Output (Max)：21.5V
- Current - Output：4.5A (Switch)
- Frequency - Switching：500kHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Supplier Device Package：DDPAK-7
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Overview
The LT1374IR-SYNC#PBF is a monolithic buck switching regulator from Analog Devices, featuring an integrated 4.5A power switch and fixed 500kHz switching frequency. It operates with an input voltage range of 5V to 25V and delivers up to 3.6A output current in a DDPAK-7 surface-mount package. The device includes cycle-by-cycle current limiting, shutdown capability, and low quiescent current of 20µA. Designed for high efficiency, it supports external synchronization and utilizes all surface-mount components to minimize inductor size.
Feature Summary
- Integrates a 4.5A power switch with constant 500kHz frequency operation
- Supports external clock synchronization for noise immunity
- Features cycle-by-cycle current limiting and shutdown control
- Utilizes compact DDPAK-7 package for space-constrained designs
Applications
- Point-of-load regulation in portable handheld devices
- Board-level DC-DC conversion for disk drives
- Power supply stages in personal computer systems
- General step-down regulation for embedded applications
Procurement Notes
Verify the specific suffix 'SYNC' indicates external synchronization capability rather than internal oscillator only. Confirm the 'IR' designation corresponds to the industrial temperature range (-40°C to +125°C) and the 'DDPAK-7' package type. Ensure RoHS compliance status matches current manufacturing standards. Cross-reference the datasheet revision to confirm pinout compatibility with existing PCB footprints before finalizing procurement orders.
Selection Notes
Select this component when a fixed 5V output at high current is required without adjustable feedback networks. The fixed 500kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the thermal performance of the DDPAK-7 package for heat dissipation requirements. Verify that the input voltage range of 5V to 25V aligns with the system's power rail specifications.
Part Context
This part belongs to the LT1374 family of high-efficiency buck regulators. It shares functional similarities with the LT1506 but is optimized for higher input voltages up to 25V. The synchronous version variant typically offers improved efficiency over non-synchronous counterparts by replacing the catch diode with an internal MOSFET, though specific internal topology details should be confirmed in the official datasheet.
Replacement Considerations
LT1374CR-SYNC#PBF serves as a parameter-equivalent alternative with commercial temperature range. LT1374HVCS8#PBF offers adjustable output voltage in an SOIC package. Verify thermal resistance and pinout compatibility when substituting. Check if the replacement part maintains the same synchronization capability and current rating.
