LQ05041QCS6

Overview

The Littelfuse LQ05041QCS6 is a single-channel ultra-low consumption load switch IC designed for power distribution applications. It supports an input voltage range of 1.1 V to 5.5 V and delivers a continuous output current of 4 A with a maximum on-resistance of 21 mΩ. The device features true reverse current blocking (TRCB) and integrated slew rate control to manage inrush currents. Key timing parameters include a maximum turn-on time of 450 µs and a maximum sleep time of 20 µs. It operates within a temperature range of -40 °C to +85 °C and is housed in a compact WLCSP-6 package.

Feature Summary

• Integrates true reverse current blocking (TRCB) to prevent backflow from output capacitors, eliminating the need for external blocking diodes.
• Includes built-in slew rate control functionality to limit inrush current during startup, protecting upstream power sources and downstream loads.
• Delivers ultra-low static current (IQ) and low shutdown current (ISD) to minimize parasitic leakage and extend battery life in portable devices.
• Utilizes a chip-level WLCSP footprint to replace discrete MOSFET and diode solutions, significantly reducing printed circuit board area requirements.

Applications

• Mobile and handheld consumer electronics
• Wearable electronic devices
• Internet of Things (IoT) nodes
• Solid-state drive (SSD) storage systems
• Building automation controllers

Procurement Notes

Verify the specific suffix 'Q' against the manufacturer's official documentation to confirm it denotes automotive qualification or specific reliability standards rather than standard commercial grade. Ensure the WLCSP-6 package dimensions match your PCB land pattern design. Confirm RoHS compliance status directly from the latest datasheet revision before finalizing procurement specifications.

Selection Notes

Select this component when system design requires a 4 A load switch with integrated reverse blocking capabilities to simplify the bill of materials. The inclusion of slew rate control makes it suitable for applications sensitive to inrush current spikes. Compare its ultra-low IQ against other series members like the LQ05041RCS6 if reverse blocking is not required, or the LQ05041QCS4 if lower current ratings suffice for the target application.

Part Context

This part belongs to Littelfuse’s ultra-low consumption load switch family, which integrates multiple functions into a small form factor. The series is engineered to replace discrete power management circuits, offering benefits such as reduced PCB space and improved efficiency. It complements other variants in the lineup that offer different current ratings or feature sets like basic switching without reverse blocking.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult Littelfuse technical support for qualified alternatives or cross-reference based on pin-compatible packages and identical electrical specifications such as 4 A rating and TRCB integration.