RT9742SNGV

Overview

The RT9742SNGV is a single N-MOSFET high-side power switch IC designed for USB applications. It features a maximum on-resistance of 70 mΩ and supports an output current of 500 mA. The device operates within a supply voltage range of 2.7 V to 6 V. Key protection circuits include over-current, short fold-back, thermal shutdown, and under-voltage lockout. An embedded delay function prevents miss-operation due to inrush current, and a flag output indicates fault conditions. It is housed in a SOT-23-3 package.

Feature Summary

• Integrates comprehensive protection mechanisms including over-current, short circuit, thermal shutdown, and under-voltage lockout.
• Provides a flag output signal to indicate fault conditions to the local controller.
• Features an embedded delay function to prevent false triggering caused by inrush currents.

Applications

• USB peripheral power switching
• Notebook PC power distribution
• Portable electronic device power management

Procurement Notes

Verify the specific suffix 'SNGV' corresponds to the SOT-23-3 package and 500 mA rating variant. Confirm RoHS compliance status with the manufacturer. Ensure the ordering part number matches the required pin configuration and tape-and-reel specifications for your assembly process.

Selection Notes

Select this component for low-voltage USB applications requiring a single-channel high-side switch. Consider the 70 mΩ on-resistance for efficiency and the 500 mA current limit for load requirements. The SOT-23-3 package suits space-constrained designs. Verify that the 2.7 V minimum operating voltage aligns with your system's power rails.

Part Context

The RT9742 series comprises cost-effective, low-voltage power switches available in multiple current ratings and packages. The RT9742SNGV specifically denotes the 500 mA variant in the SOT-23-3 package. Other variants in the family offer higher current capacities such as 1 A, 1.5 A, 2 A, 2.5 A, and 3 A, often in TSOT-23-5 packages.

Replacement Considerations

Check for other RT9742 variants with different current ratings or packages if electrical requirements change. Verify pin compatibility when substituting with similar high-side switches from other manufacturers.