LT1777IS#PBF

Overview

The LT1777IS#PBF is a low noise, high performance step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 6.7 V to 48 V and provides an adjustable output voltage from 1.24 V to 30 V. The device delivers a maximum switch current of 550 mA at a fixed switching frequency of 100 kHz. It features a low quiescent current of 620 µA and a shutdown current of 30 µA. The component is housed in a 16-lead SOIC package and supports an operating temperature range from -40°C to +125°C.

Feature Summary

• Integrated low noise architecture designed for sensitive analog circuitry
• Fixed 100 kHz switching frequency minimizes external component size
• Shutdown pin enables significant reduction in supply current consumption

Applications

• Portable instrumentation requiring low noise power supplies
• Battery-powered systems needing efficient DC-DC conversion
• Industrial control modules with wide input voltage ranges

Procurement Notes

Verify the specific suffix designation against official manufacturer documentation to confirm package type and tape/reel specifications. Ensure that the ordering information matches the exact thermal and electrical requirements for the target application environment.

Selection Notes

Select this component when a stable, low-noise buck converter is required for inputs up to 48 V. Consider the 16-lead SOIC package constraints and the 100 kHz frequency trade-off between efficiency and passive component size relative to higher frequency alternatives.

Part Context

This part belongs to the LT1777 family of switching regulators. It is distinct from other Analog Devices products by its specific combination of low noise characteristics and wide input voltage capability within a standard surface-mount package format.

Replacement Considerations

LT1777CS#PBF is a documented substitute variant within the same product family.