LTC1147LCS8-3.3#PBF

Overview

The LTC1147LCS8-3.3#PBF is a step-down switching regulator controller from Analog Devices, housed in an 8-lead SOIC package. It operates with an input voltage range of 3.5 V to 16 V and provides a fixed 3.3 V output. The device supports up to 1.25 A output current and features automatic Burst Mode operation for high efficiency at low loads. Key electrical parameters include a 400 kHz switching frequency, 20 uA static current, and 1.6 mA operating supply current. It offers load regulation of 40 mV and includes shutdown functionality.

Feature Summary

• Features automatic Burst Mode operation to maintain high efficiencies at low output currents
• Provides fixed 3.3 V output via buck topology switching regulator control
• Includes shutdown capability for power management flexibility

Applications

• Battery-powered portable equipment requiring efficient low-load performance
• Systems needing a stable 3.3 V rail from higher voltage sources
• Space-constrained designs utilizing 8-lead SOIC packaging

Procurement Notes

Verify the specific suffix 'LCS8' against official Analog Devices documentation to confirm package dimensions and thermal characteristics. Ensure compatibility with external components such as inductors and diodes specified in the datasheet. Confirm RoHS compliance status through the manufacturer's latest material declaration. Cross-reference the part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a fixed 3.3 V output is required without external feedback resistors. Consider the 400 kHz switching frequency for balancing component size and efficiency. Evaluate the 20 uA quiescent current for battery life requirements. Compare with other LTC1147 variants if different output voltages or industrial temperature ranges are needed.

Part Context

This part belongs to the LTC1147 series of high-efficiency buck switching regulator controllers. It is designed for applications where efficiency across varying load conditions is critical. The series typically includes variants with different output voltages and package options, catering to diverse power management needs in consumer and industrial electronics.

Replacement Considerations

Check for direct pin-compatible alternatives within the LTC1147 family, such as LTC1147IS8-3.3#PBF for extended temperature ranges. Verify that any substitute maintains the same 3.3 V output and Burst Mode functionality.