LT1938IDD#TRPBF

Overview

The LT1938IDD#TRPBF is a monolithic buck switching regulator from Analog Devices Inc., housed in a 10-lead DFN package. It accepts input voltages up to 25V and delivers an adjustable output voltage ranging from 1.265V to 20V with a maximum continuous current of 2.2A. The device features an adjustable switching frequency between 300kHz and 3MHz, allowing optimization for efficiency or size. It operates within a junction temperature range of 0°C to 125°C and includes internal compensation for stable operation.

Feature Summary

• Adjustable switching frequency allows trade-off between component size and efficiency
• Integrated error amplifier and current mode control architecture
• Internal soft-start circuitry limits inrush current during startup
• Thermal shutdown protection safeguards against overheating

Applications

• Industrial point-of-load regulation
• Battery-powered equipment power supplies
• Embedded system voltage conversion
• General-purpose DC-DC step-down applications

Procurement Notes

Verify the specific suffix 'IDD' indicates the industrial temperature grade variant when sourcing. Confirm that the '#TRPBF' designation ensures lead-free tape and reel packaging compatible with standard surface-mount assembly processes. Cross-reference the manufacturer's latest datasheet to ensure compliance with current environmental directives and material declarations before finalizing procurement orders.

Selection Notes

Select this component when a compact solution is required for inputs up to 25V with moderate current demands. The adjustable frequency feature permits customization based on available inductor and capacitor values. Ensure the application requires a non-synchronous topology, as this part utilizes external N-channel MOSFETs rather than integrated synchronous rectifiers, impacting overall efficiency calculations at light loads.

Part Context

This part belongs to the LT1938 family of high-voltage buck regulators designed by Analog Devices. It serves as a complete switching regulator solution requiring minimal external components. The DFN package provides thermal performance suitable for space-constrained designs. It complements other PMIC offerings by addressing mid-range voltage conversion needs without the complexity of discrete controller implementations.

Replacement Considerations

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