LT1767EMS8

Overview

The LT1767EMS8 is a monolithic buck switching regulator from Analog Devices, operating at a fixed 1.25MHz frequency. It integrates a high-efficiency 1.5A power switch and complete current-mode control circuitry on a single die. The device supports an input voltage range of 3V to 25V and delivers up to 1.5A output current. It is housed in an 8-lead MSOP package with an exposed pad for thermal management. The controller provides fast transient response and excellent loop stability, suitable for space-constrained DC-to-DC applications.

Feature Summary

• Integrates a high-efficiency 1.5A synchronous power switch within the monolithic die
• Utilizes current-mode control architecture for rapid transient response and stable operation
• Operates at a fixed 1.25MHz switching frequency to minimize external component size

Applications

• Portable battery-powered equipment requiring efficient step-down conversion
• Local voltage regulation in larger systems with varying input sources
• General-purpose DC-to-DC conversion for embedded circuits

Procurement Notes

Verify the specific suffix (e.g., -1.8, -2.5, -3.3) against the required output voltage configuration, as these variants are factory-set. Confirm the presence of the exposed pad (EP) variant if thermal performance is critical, as standard MSOP packages may differ in thermal characteristics. Ensure compatibility with the 3V to 25V input range for the target application environment.

Selection Notes

Select this component when a fixed-frequency, high-current buck converter is needed in a small footprint. The 1.25MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the thermal dissipation requirements of the MSOP package for loads approaching the 1.5A limit. Verify that the fixed output voltage variant matches the system rail requirements without needing external feedback adjustments.

Part Context

The LT1767 belongs to Linear Technology's family of high-frequency step-down switching regulators. It is designed to replace linear regulators in applications where efficiency and heat dissipation are concerns. The EMS8 package provides a compact solution for modern PCB layouts, balancing electrical performance with physical size constraints in portable and industrial designs.

Replacement Considerations

Direct replacements include other Analog Devices buck converters such as the LT1766 or LT1768 series, depending on current and frequency requirements. Cross-vendor equivalents should be evaluated for pin compatibility, switching frequency, and thermal performance to ensure seamless integration into existing designs.