LT1374IR#PBF

Overview

The LT1374IR#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc. It operates at a constant 500kHz frequency and features an integrated 4.5A power switch. The device accepts an input voltage range of 5V to 25V and provides a fixed 5V output with a maximum current capability of 3.6A. It utilizes a DDPAK-7 surface-mount package and supports shutdown functionality. Key electrical parameters include a quiescent current of 20µA in shutdown mode and a typical operating supply current of 2.5mA. The component is rated for operation between -40°C and +125°C.

Feature Summary

• Integrates a high-current 4.5A switch within a compact monolithic design
• Maintains a fixed 500kHz switching frequency for reduced external component size
• Supports cycle-by-cycle current limiting for robust protection
• Features low static current consumption during shutdown operations

Applications

• Point-of-load regulation for digital signal processors
• Power supplies for embedded microcontroller systems
• General-purpose DC-DC conversion in industrial equipment
• Battery-powered devices requiring efficient step-down topology

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm pinout compatibility and thermal characteristics. Ensure that the DDPAK-7 package variant matches the intended PCB footprint requirements. Cross-reference the manufacturing date code and lot traceability if long-term supply continuity is critical for the production lifecycle. Confirm RoHS compliance status through the latest datasheet revision notes provided by the manufacturer.

Selection Notes

Select this component when a fixed 5V output is required from a 5V to 25V input rail without needing adjustable feedback networks. The fixed output simplifies layout compared to adjustable variants like the LT1374CR. Consider the thermal performance of the DDPAK-7 package relative to the expected load current and ambient temperature conditions. Evaluate the need for synchronization capabilities if multiple converters operate in close proximity to prevent audible noise or interference.

Part Context

The LT1374 series represents a family of high-efficiency step-down regulators designed for applications demanding significant output current in small form factors. The IR variant specifically denotes the fixed 5V output configuration, distinguishing it from adjustable versions such as the LT1374CR or high-voltage variants like the LT1374HV. This part belongs to the broader PMIC category under Analog Devices' power management portfolio, emphasizing reliability and ease of implementation in standard buck converter topologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.