LT1767EMS8-3.3#PBF

Overview

The LT1767EMS8-3.3#PBF is a monolithic synchronous step-down switching regulator manufactured by Analog Devices Inc., housed in an 8-pin MSOP package with an exposed thermal pad. It integrates a high-efficiency 1.5A power switch and control circuitry for a 1.25MHz current-mode operation. The device provides a fixed 3.3V output capable of delivering up to 1.5A. It supports an input voltage range from 3V to 25V, accommodating both Buck and SEPIC topologies. Key electrical specifications include a maximum operating junction temperature of 125°C, a minimum operating temperature of -40°C, and a quiescent supply current of 1mA. The component complies with RoHS3 standards.

Feature Summary

• Integrates a high-efficiency 1.5A internal power switch with complete current-mode control circuitry for fast transient response and excellent loop stability.
• Supports flexible DC-DC conversion topologies including Buck and SEPIC configurations within a single compact surface-mount package.
• Features low quiescent current consumption of 1mA to optimize system efficiency during standby or light-load conditions.

Applications

• Dual source supply systems requiring reverse leakage current management
• Buck converter circuits stepping down 12V to 3.3V for digital logic loads
• Dual-output SEPIC converters providing isolated or non-isolated rails such as ±5V
• General-purpose 1.5A synchronous step-down power regulation

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging when sourcing. Confirm the 8-MSOP-EP package variant matches the thermal requirements of the target PCB layout. Ensure the fixed 3.3V output version aligns with the design voltage needs, as other voltage options exist within the LT1767 family. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component for applications requiring a robust 1.5A output current in a small footprint. The fixed 3.3V output eliminates external feedback resistor networks, simplifying the design. Consider the 1.25MHz switching frequency for balancing component size and efficiency. Verify that the input voltage range of 3V to 25V covers the system's operational envelope. The exposed pad design necessitates adequate thermal grounding on the printed circuit board.

Part Context

This part belongs to the LT1767 series of monolithic synchronous step-down switching regulators. The series is characterized by its integrated 1.5A switch and 1.25MHz current-mode control architecture. The EMS8-3.3 designation specifies the 8-pin MSOP package with an exposed pad and a fixed 3.3V output voltage. The series supports both Buck and SEPIC operations, offering versatility for various power conversion needs.

Replacement Considerations

LT1767EMS8E-3.3#PBF serves as a verified equivalent part number within the same product line, often indicating minor manufacturing or marking variations while maintaining identical electrical specifications and functionality.