LT3481EMSE#PBF

Overview

The LT3481EMSE#PBF is a monolithic buck switching regulator from Analog Devices Inc. It accepts input voltages up to 34V, with a maximum rating of 36V. The device provides a maximum output current of 2A and operates at an adjustable frequency ranging from 300kHz to 2.8MHz. It features low quiescent current, specified as 50µA in official documentation, and supports Burst Mode operation for low ripple performance. The component is housed in a 10-TFSOP or 10-MSOP package with a width of 3.00mm and an exposed pad.

Feature Summary

• Adjustable switching frequency allows optimization for efficiency and component size across a wide range.
• Burst Mode operation ensures low ripple and high efficiency during light load conditions.
• Integrated synchronous rectification eliminates the need for external Schottky diodes.
• Wide input voltage range accommodates various power supply sources including single-cell Li-ion batteries.

Applications

• Portable equipment requiring efficient step-down conversion from battery sources
• Industrial control systems utilizing 24V or 36V input rails
• Automotive electronics operating within standard voltage ranges
• Communication infrastructure power distribution networks

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when ordering. Confirm the MSOP-10 package variant matches the PCB footprint requirements. Ensure the operating temperature range meets the application environment specifications. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Check for any recent design revisions that may affect pin compatibility or thermal performance.

Selection Notes

Select this regulator when input voltages exceed 30V and high-frequency operation is desired to minimize passive component size. Consider the 2A current limit for moderate power applications. Evaluate the thermal performance of the MSOP package against the expected load current and ambient temperature. Compare the adjustable frequency range against EMI constraints of the system. Assess the need for Burst Mode operation if low noise at light loads is critical.

Part Context

The LT3481 belongs to Analog Devices' family of high-voltage step-down switching regulators. It is designed for applications requiring compact solutions with high efficiency. The EMSE designation specifies the MSOP-10 package with an exposed pad for improved thermal dissipation. This series complements other linear and switching regulators in the portfolio, targeting portable and industrial markets.

Replacement Considerations

Direct substitutes include the LT3480 for lower current requirements or the LT3482 for higher current capabilities. Verify pinout compatibility before substitution. Check if the replacement device offers similar input voltage ranges and switching frequencies. Ensure thermal characteristics match the existing board layout constraints.

FAQ

What is the maximum input voltage for the LT3481EMSE#PBF?

The device accepts input voltages up to 34V continuously, with a maximum absolute maximum rating of 36V.

How is the switching frequency adjusted?

The switching frequency is adjustable from 300kHz to 2.8MHz using a single external resistor connected to the RT/CLK pin.

Does the LT3481 require an external catch diode?

No, the LT3481 integrates a synchronous rectifier, eliminating the need for an external Schottky diode.