SC1548CSK-1.8

Overview

The SC1548CSK-1.8 is a linear FET controller from Semtech’s SmartLDO family, designed to drive an external N-channel MOSFET for regulated power supply generation. It provides a fixed 1.818V output with ±2.5% accuracy over line, load, and temperature variations. The device operates from input voltages ranging from 2.7V to 21V and supports output currents up to 1A. Key features include active high enable control and overcurrent protection that latches off if the output drops below 50% of nominal for greater than 4ms.

Feature Summary

• Provides tight output voltage regulation with ±2.5% accuracy across line, load, and temperature conditions.
• Integrates active high enable control with internal pullup resistor for simple system management.
• Includes overcurrent protection circuitry that monitors output voltage and latches off during fault conditions.

Applications

• Motherboards
• Graphics cards
• Microcontrollers
• Simple power supplies

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment upon receipt. Check datasheet revisions for any updates to electrical characteristics or thermal parameters. Ensure handling precautions are followed due to ESD sensitivity. Validate ordering suffixes match specific voltage options before integration.

Selection Notes

Select this controller when a stable 1.818V rail is required from higher voltage inputs like 3.3V or 12V. Consider the external N-channel MOSFET selection carefully, as its RDS(ON) impacts efficiency and short-circuit protection thresholds. Ensure the input supply can support the quiescent current requirements. Evaluate thermal dissipation needs based on the voltage drop and load current in the final application design.

Part Context

The SC1548 belongs to Semtech’s SmartLDO product family, which focuses on linear FET controllers for power management applications. This series offers various fixed and adjustable voltage options to suit different digital logic levels. The SC1548 specifically targets low-cost, single-rail regulation needs in computing and graphics hardware environments.

Replacement Considerations

SC1548CSK-1.5TRT is a compatible variant within the same family offering a 1.515V fixed output. Both share identical pinouts and functional blocks. Verify that the target voltage requirement aligns with the replacement part's specification before substitution.