LT3973HDD-5#TRPBF

Overview

The LT3973HDD-5#TRPBF is a monolithic buck switching regulator from Analog Devices Inc. It accepts an input voltage range of 4.2V to 42V and provides a fixed 5V output with a maximum current of 750mA. The device features an adjustable switching frequency from 195kHz to 2.15MHz and consumes only 2.5µA of quiescent current. It operates within a temperature range of -40°C to +150°C TJ and utilizes a 10-WFDFN exposed pad package.

Feature Summary

• Adjustable frequency operation allows optimization for efficiency or component size
• Ultra-low quiescent current supports battery-powered applications
• Wide input voltage range accommodates various power sources
• Integrated synchronous rectification improves conversion efficiency

Applications

• Industrial control systems
• Portable instrumentation
• Embedded computing platforms
• Automotive electronics

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the fixed 5V output variant matches system requirements, as other voltage options exist in the LT3973 family. Ensure thermal design accounts for the exposed pad requirement in the WDFN-10 package for proper heat dissipation during operation.

Selection Notes

Select this part when a fixed 5V rail is required from a wide input range up to 42V. Consider the adjustable frequency feature if minimizing external inductor size is critical. Verify that the 750mA output current meets load demands. Check compatibility with the desired switching frequency range against electromagnetic interference constraints.

Part Context

This component belongs to the LT3973 series of high-efficiency, low-noise step-down converters. The series is designed for applications requiring small solution size and low standby power. The HDD suffix denotes the specific package type and temperature rating, while the -5 indicates the fixed output voltage configuration.

Replacement Considerations

LT3973IDD#PBF offers similar electrical characteristics but in tube packaging instead of tape and reel. Other LT3973 variants provide different fixed output voltages such as 1.21V, 1.8V, or 3.3V. Direct pin-compatible substitutes may include other Analog Devices buck regulators with comparable input ranges and current capabilities.