W83L351YG

Specialized Overview

The W83L351YG is an ExpressCard power interface switch designed for ExpressCard|34 and ExpressCard|54 modules. It provides three switched outputs: AUXOUT, 3.3VOUT, and 1.5VOUT. The device supports system wake functions and includes short circuit and thermal protection mechanisms. It operates within a 0°C to 70°C ambient temperature range and is available in a 20-pin QFN package.

Specialized Feature Summary

• Complies with the ExpressCard standard and implementation guidelines.
• Supports system wake functionality for connected modules.
• Includes integrated short circuit and thermal protection circuits.

Specialized Applications

• ExpressCard|34 module power management
• ExpressCard|54 module power management
• PCI Express-based card power switching

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and compliance status. Confirm that the component meets all necessary regulatory requirements for the intended application environment before finalizing procurement decisions.

Specialized Selection Notes

Select this component when designing power interfaces for ExpressCard modules requiring compliant voltage sequencing and protection. Ensure the design accommodates the required input voltages and output current capabilities specified in the datasheet for reliable operation.

Specialized Part Context

This component belongs to Nuvoton's portfolio of power management solutions specifically tailored for peripheral connectivity standards. It addresses the power delivery and control requirements defined by the ExpressCard specification, ensuring compatibility with host systems and expansion cards.

Specialized Replacement Considerations

No publicly confirmed substitute part numbers are available in the provided documentation. Verify pinout and functional compatibility if considering alternative components from other manufacturers.

Specialized FAQ

What is the function of the RCLKEN pin?

RCLKEN serves as both an input and output. As an output, it indicates power good to the host without delay. As an input, keeping it low prevents PERST# from de-asserting, allowing the host to delay the start of the PERST# internal timer.

How does the W83L351YG detect USB versus PCI Express cards?

It uses the CPUSB# and CPPE# pins. A logic low on CPUSB# indicates a USB-capable card, while a logic low on CPPE# indicates a PCI Express-capable card. These pins are internally pulled up to AUXIN.

What happens when SHDN# is asserted?

Asserting SHDN# (logic low) instructs the power switch to turn off all voltage outputs and activates the discharge FETs, pulling the output voltages to ground.