LQ05021QCS4

Overview

The Littelfuse LQ05021QCS4 is an ultra-low consumption load switch IC designed for power distribution applications. It supports a supply voltage range of 1.1 V to 5.5 V and delivers a maximum output current of 2 A with a typical on-resistance of 56 mΩ. The device features integrated slew rate control to manage inrush currents. Operating temperatures span from -40°C to +85°C, and it is housed in a compact WLCSP-4 package.

Feature Summary

• Integrates true slew rate control functionality to manage output voltage transitions
• Provides ultra-low static current consumption to extend battery life in portable devices
• Utilizes chip-level packaging to minimize printed circuit board space requirements

Applications

• Mobile handheld devices
• Wearable electronic equipment
• Internet of Things (IoT) nodes
• Solid-state drive storage systems

Procurement Notes

Verify the specific suffix CS4 against the manufacturer's official datasheet to confirm the presence of slew rate control and package dimensions. Ensure compatibility with the target operating temperature range of -40°C to +85°C. Confirm RoHS compliance status through the latest component declaration documents before finalizing procurement specifications.

Selection Notes

Select this component when design constraints require a single-channel load switch with active slew rate limiting capabilities. The 2 A current rating suits moderate power distribution needs within mobile form factors. The WLCSP-4 footprint offers a significant area reduction compared to discrete MOSFET solutions, making it suitable for high-density PCB layouts where space is at a premium.

Part Context

This part belongs to the Littelfuse LQ0502x series of multifunctional load switches. These devices are engineered to replace discrete protection circuits by integrating power switching, reverse current blocking, and discharge functions into a single chip-level package. The series targets efficiency improvements in consumer electronics and IoT applications requiring low quiescent current operation.

Replacement Considerations

The LQ05021RCS4 serves as a functional alternative within the same series, offering true reverse current blocking instead of slew rate control. Designers must verify if the specific application requires inrush limiting or reverse polarity protection to determine the correct variant.