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RT9742HNGJ5F
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Product Detailed Parameters
- Description：IC PWR SWTCH N-CHAN 1:1 TSOT23-5
- Series：-
- Mfr：Richtek USA Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Switch Type：USB Switch
- Number of Outputs：1
- Ratio - Input:Output：1:01
- Output Configuration：High Side
- Output Type：N-Channel
- Interface：On/Off
- Voltage - Load：2.7V ~ 6V
- Voltage - Supply (Vcc/Vdd)：Not Required
- Current - Output (Max)：1A
- Rds On (Typ)：55mOhm
- Input Type：Non-Inverting
- Features：Status Flag
- Fault Protection：Current Limiting (Fixed), Over Temperature, Reverse Current, UVLO
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Supplier Device Package：TSOT-23-5
- Package / Case：SOT-23-5 Thin, TSOT-23-5
- Grade：-
- Qualification：-
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Overview
The RT9742HNGJ5F is a single N-channel high-side power switch IC designed for USB applications. It operates within a voltage range of 2.7V to 6V and supports an output current of 1A. The device features a maximum on-resistance of 70mΩ and includes integrated protection circuits such as over-current, short circuit fold-back, thermal shutdown, and under-voltage lockout. A flag output indicates fault conditions, while an embedded delay function prevents inrush current issues.
Feature Summary
- Integrates comprehensive fault protection including fixed current limit, short fold-back, thermal shutdown, and UVLO.
- Provides a status flag output to signal fault conditions to the local USB controller.
- Features an embedded delay function to prevent misoperation caused by inrush current.
Applications
- USB peripheral power supply
- Notebook PC power distribution
Procurement Notes
Verify the specific suffix 'HNGJ5F' against official Richtek documentation to confirm pinout and electrical parameters. Ensure compatibility with TSOT-23-5 (FC) footprint requirements. Confirm RoHS compliance status through the manufacturer's declaration before procurement.
Selection Notes
Select this component for low-voltage USB power switching where compact packaging is required. The 70mΩ resistance suits 1A load applications. Verify that the 2.7V minimum operating voltage aligns with the system's power rail specifications.
Part Context
This part belongs to the RT9742 family of cost-effective, low-voltage high-side power switches. The series offers various current ratings and package options, including TSOT-23-5 and SOT-23-3, tailored for flexible USB power management solutions.
Replacement Considerations
Check for variants like RT9742AGJ5F or RT9742ENGJ5F if different current ratings or resistance values are acceptable. Ensure substitute parts match the TSOT-23-5 (FC) package and functional pinout.
FAQ
What is the purpose of the flag output?
The flag output indicates fault conditions to the local USB controller, allowing the system to respond to errors such as over-current or thermal shutdown.
How does the device handle inrush current?
The chip integrates an embedded delay function to prevent misoperation that could occur due to inrush current during startup.
