LT3972IDD#PBF

Overview

The LT3972IDD#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.6 V to 33 V and delivers up to 3.5 A of output current. The device features an adjustable switching frequency from 200 kHz to 2.4 MHz, enabling optimization for efficiency or transient response. It supports output voltages between 790 mV and 30 V. Key electrical specifications include a quiescent current of 75 µA during operation and 30 µA in shutdown mode. The component is housed in a 10-lead DFN package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Synchronous buck topology providing high efficiency across wide load ranges
• Adjustable switching frequency allows design flexibility for size and performance trade-offs
• Integrated low quiescent current modes support battery-powered applications
• Compact surface-mount packaging facilitates dense PCB layouts

Applications

• Industrial control systems requiring stable power rails
• Portable instrumentation powered by single-cell lithium batteries
• Embedded computing modules needing efficient voltage regulation
• Automotive infotainment subsystems operating within specified voltage limits

Procurement Notes

Verify the exact part number suffix against official Analog Devices documentation to confirm package type and temperature grade. Confirm RoHS compliance status through the manufacturer's declaration. Check current availability as distribution channels may report limited stock or discontinuation. Ensure ordering quantities match factory tube packaging requirements rather than reel quantities.

Selection Notes

Select this component when input voltages remain below 33 V and output currents do not exceed 3.5 A. Consider the adjustable frequency feature if electromagnetic interference mitigation is required. Evaluate thermal performance based on ambient conditions and PCB copper area. Compare quiescent current specifications against system sleep requirements to ensure adequate battery life extension.

Part Context

This device belongs to the LT3972 family of high-efficiency synchronous buck converters. It shares architectural similarities with other members like the LT3973 but differs in maximum input voltage and output current capabilities. The IDD suffix indicates a specific lead-free package variant compliant with modern environmental standards. Development kits such as DC1458A are available for evaluation purposes.

Replacement Considerations

Direct substitutes include LT3973IDD#PBF for higher input voltage tolerance or LT3970IDDB variants for lower current applications. Verify pin compatibility and thermal characteristics before substitution. Cross-reference datasheets to ensure equivalent switching frequency ranges and control loop stability.