LQ05021RCS4

Overview

The Littelfuse LQ05021RCS4 is a single-channel ultra-low consumption load switch rated for 5V and 2A. It features true reverse current blocking (TRCB) to prevent backflow when the output voltage exceeds the input. The device operates within a supply voltage range of 1.5V to 5.5V, with a maximum on-resistance of 52mΩ. It utilizes a WLCSP-4 package with dimensions of 0.77mm x 0.77mm x 0.46mm. The component supports an operating temperature range from -40°C to +85°C, ensuring reliability in compact electronic designs.

Feature Summary

• Integrates true reverse current blocking to eliminate parasitic leakage paths during off-states or system power-down scenarios.
• Delivers ultra-low static current and low on-resistance to maximize system efficiency and extend battery life in portable devices.
• Utilizes a chip-level WLCSP footprint to replace discrete MOSFETs and diodes, significantly reducing PCB area requirements.

Applications

• Battery charging equipment power saving
• Power sequence control systems
• Power multiplexer (PMUX) applications
• Wearable devices and smartwatches
• IoT sensors and handheld electronics

Procurement Notes

Verify the specific suffix 'RCS4' to confirm the inclusion of True Reverse Current Blocking functionality, as other variants in the LQ050 series may feature slew rate control instead. Ensure the design accommodates the WLCSP-4 thermal pad requirements for proper heat dissipation. Confirm that the 2A continuous current rating aligns with the peak load demands of the target application circuit.

Selection Notes

Select this component when reverse current isolation is critical to protect upstream power sources or maintain system state during power loss. Compare against LQ05021QCS4 if slew rate control is preferred over reverse blocking. Consider the 52mΩ on-resistance impact on voltage drop at full load. Evaluate the small form factor benefits against assembly complexity constraints associated with chip-scale packages.

Part Context

This part belongs to the Littelfuse LQ050 series of integrated load switches designed for mobile and IoT applications. The series focuses on minimizing quiescent current and improving overall system efficiency through advanced CMOS technology. It serves as a direct replacement for discrete power management solutions, offering higher integration density and lower standby power consumption compared to traditional MOSFET-based switches.

Replacement Considerations

LQ05021QCS4 offers similar electrical characteristics but replaces reverse blocking with slew rate control functionality.