LQ05022QCS4

Overview

The LQ05022QCS4 is a 5V, 2A ultra-low power load switch integrated circuit from Littelfuse. It features slew rate control to limit inrush current and operates with low static current (IQ) and off-state leakage (ISD). The device utilizes a chip-level WLCSP package measuring 0.77mm x 0.77mm x 0.46mm with a 0.4mm pitch. Designed for high efficiency, it reduces parasitic leakage currents to extend battery life in portable electronics.

Feature Summary

• Integrates true reverse current blocking (TRCB) to prevent backflow when system output exceeds input voltage.
• Includes fast output discharge capability to rapidly drain output capacitors upon shutdown, preventing unpredictable downstream behavior.
• Offers slew rate control functionality to manage voltage transition rates and suppress surge currents during turn-on.

Applications

• Handheld mobile devices
• Wearable electronic products
• Internet of Things (IoT) sensors
• Solid State Drive (SSD) storage systems

Procurement Notes

Verify the specific suffix CS4 corresponds to the required 4-bump WLCSP package configuration. Confirm that the 5V rating and 2A continuous current capacity align with the target application's electrical requirements before finalizing procurement.

Selection Notes

Select this component for designs prioritizing minimal PCB footprint and extended battery longevity. The integrated TRCB eliminates the need for external blocking diodes, while the low IQ and ISD specifications ensure minimal power drain in standby modes compared to discrete MOSFET solutions.

Part Context

This part belongs to the LQ050 series of multifunctional load switches released by Littelfuse. The series combines protection and switching functions into a single chip-level package, replacing complex discrete circuits comprising power MOSFETs, reverse diodes, and passive components to save space and improve efficiency.

Replacement Considerations

Compatible alternatives within the same family include the LQ05021QCS4 and LQ05021RCS4. Designers must verify functional differences, specifically that the LQ05022QCS4 includes slew rate control whereas other variants may prioritize different protection features like TRCB only.

FAQ

Does the LQ05022QCS4 support reverse current blocking?

Yes, the LQ05022QCS4 integrates true reverse current blocking (TRCB) to detect when system output voltage exceeds input voltage and block reverse flow.

What is the primary benefit of the slew rate control feature?

Slew rate control allows the device to regulate the output voltage transition speed, effectively limiting inrush or surge currents during startup.