RT9742DNGJ5

Overview

The RT9742DNGJ5 is a single-channel, low-voltage N-MOSFET high-side power switch IC designed for USB applications. It features an on-resistance of 70mΩ and supports a continuous output current of 1A. The device operates within a supply voltage range of 2.7V to 6V. Integrated protection circuits include over-current protection with short fold-back, thermal shutdown, and under-voltage lockout. A flag output indicates fault conditions to the local controller, while an embedded delay function prevents misoperation due to inrush current.

Feature Summary

• Integrates over-current protection with short fold-back circuitry for robust load management
• Includes a status flag output to signal fault conditions to the host controller
• Features embedded delay functionality to prevent false triggering from inrush currents
• Provides comprehensive protection via thermal shutdown and under-voltage lockout mechanisms

Applications

• USB peripheral power distribution
• Notebook PC power switching
• Handheld device power management

Procurement Notes

Verify the specific suffix 'DNGJ5' against official Richtek documentation to confirm package type and tape-and-reel specifications. Ensure the selected variant matches the required 1A current rating and 70mΩ resistance parameters for your design. Cross-reference ordering codes with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a single-channel high-side switch with integrated fault signaling is required. The 1A current limit suits moderate-load USB peripherals. Consider the TSOT-23-5 footprint for space-constrained designs. Verify that the 2.7V minimum operating voltage aligns with the system's battery or rail characteristics.

Part Context

The RT9742 series comprises cost-effective, low-voltage power switches optimized for USB applications. Variants differ by current ratings (0.5A to 3A) and on-resistance values. The RT9742DNGJ5 represents the 1A configuration within this family, offering a balance between conduction loss and protection capabilities for portable electronics.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.