LT3973HMSE-5#PBF

Overview

The LT3973HMSE-5#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc. It features an adjustable frequency range from 195 kHz to 2.15 MHz and accepts a wide input voltage range up to 42 V. The device provides a fixed 5 V output with a maximum current of 750 mA. It operates within a junction temperature range of -40°C to 150°C and consumes only 2.5 µA of quiescent current. Packaged in a 10-MSOP with exposed pad, it includes under-voltage lockout and shutdown capabilities for efficient power management.

Feature Summary

• Adjustable switching frequency allows optimization for efficiency or component size
• Ultra-low quiescent current consumption enhances battery life in portable applications
• Wide input voltage range supports diverse power source configurations
• Integrated thermal protection and under-voltage lockout ensure reliable operation

Applications

• Industrial control systems requiring robust step-down regulation
• Automotive electronics operating within extended temperature ranges
• Portable instrumentation benefiting from low standby current
• Embedded MCU power supplies needing stable 5V rails

Procurement Notes

Verify the specific suffix HMSE-5#PBF against the official Analog Devices datasheet to confirm the fixed 5V output and MSOP-10 package configuration. Ensure that the ordering information matches the required industrial temperature grade and pinout specifications. Cross-reference the manufacturer's part number to avoid confusion with similar variants in the LT3973 family that may have different output voltages or packages.

Selection Notes

Select this component when a fixed 5V output is required alongside high input voltage tolerance up to 42V. The adjustable frequency feature permits trade-offs between external inductor size and switching losses. Consider the 750mA output limit and the 150°C maximum junction temperature rating for thermal design. This regulator is suitable for space-constrained designs due to its compact MSOP-10 packaging and integrated diode topology.

Part Context

The LT3973 series represents Analog Devices' line of high-efficiency buck regulators designed for demanding environments. The LT3973HMSE-5#PBF specifically targets applications needing a reliable 5V supply from higher voltage sources. It belongs to the broader PMIC category, offering integrated solutions that reduce bill-of-materials count compared to discrete implementations.

Replacement Considerations

LT3973IMSE-5#PBF: Industrial grade variant with similar electrical characteristics.

FAQ

What is the maximum input voltage supported by the LT3973HMSE-5#PBF?

The device supports a maximum input voltage of 42 V.

Does the LT3973HMSE-5#PBF include internal switching elements?

Yes, it is a synchronous buck regulator with integrated power switches.