SC1548CSK-1.5

Overview

The SC1548CSK-1.5 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 1.515V output with ±2.5% accuracy over line, load, and temperature variations. The device operates from input voltages ranging from 3.0V to 12V and supports output currents up to 1A. Key features include an active high enable control and overcurrent protection that latches off if the output drops below 50% of nominal for greater than 4ms. It is housed in a compact 5-pin SOT-23 package.

Feature Summary

• Provides tight output voltage regulation with ±2.5% accuracy across line, load, and temperature conditions.
• Includes active high enable control with internal pullup resistor for simple system integration.
• Features overcurrent protection that monitors output voltage and latches off if it falls below 50% of nominal.
• Designed to drive external N-channel MOSFETs for efficient linear regulation.

Applications

• Motherboards
• Graphics cards
• Microcontrollers
• Simple power supplies

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix indicates the 1.515V fixed output variant. Check for RoHS compliance status as indicated in official documentation. Ensure handling precautions are followed due to ESD sensitivity. Review current availability status as product lifecycles may change.

Selection Notes

Select this controller when a stable 1.515V rail is required for GTL+ or AGP applications. Ensure the external MOSFET selection allows for proper gate drive voltage given the 9V minimum DRV pin guarantee. Consider thermal management for the external FET based on input-output voltage differential and load current. Verify that the 12V IN supply is available for controller operation.

Part Context

The SC1548 belongs to Semtech’s SmartLDO family of linear FET controllers. This series offers flexible voltage regulation solutions by utilizing external pass transistors. The family includes fixed voltage options like 1.515V and 1.818V, as well as adjustable variants. These components are optimized for low noise and precise regulation in portable and desktop electronics.

Replacement Considerations

Direct substitutes within the same family include the SC1548CSK-1.8 for a 1.818V output. For adjustable requirements, the SC1548CSK (blank suffix) is compatible. Cross-vendor replacements require matching SOT-23-5 packaging, similar drive characteristics, and equivalent overcurrent protection logic.