LC5901S

Overview

The LC5901S is a step-down (buck) DC-DC regulator IC designed for LED driver applications. It operates within a supply voltage range of 12V to 17V and functions at a switching frequency of 100kHz. The device features a single output and utilizes PWM dimming capabilities. It is housed in an 8-SOP package with dimensions of 3.90mm width. The component supports an operating temperature range from -40°C to 85°C and is classified as a surface-mount device without internal switches.

Feature Summary

• Buck topology DC-DC regulator optimized for high-efficiency LED driving
• Supports PWM dimming control for brightness adjustment
• Eliminates the need for external phase compensation components

Applications

• LED backlight systems
• General LED lighting applications

Procurement Notes

Verify the specific ordering suffix (e.g., STR, SCK) against the manufacturer's official documentation to ensure correct packaging and tape specifications. Confirm that the requested variant matches the required RoHS compliance status and moisture sensitivity level before finalizing procurement orders.

Selection Notes

Select this component for designs requiring a compact buck converter solution for LED strings. Ensure the input voltage stays within the 12V to 17V operational window. Consider the 100kHz switching frequency when designing passive filter components to balance efficiency and size constraints.

Part Context

This part belongs to the LC590 series of LED drivers manufactured by Sanken Electric. These integrated circuits are engineered to provide precise current regulation for LEDs while minimizing external component count. The series targets cost-effective and space-constrained lighting solutions.

Replacement Considerations

Direct substitutes are not explicitly confirmed in public documentation. Evaluate alternative buck LED drivers from Sanken or other manufacturers based on pin compatibility, voltage range, and thermal performance requirements.