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The RT9742 is a cost-effective, low-voltage, single
N-MOSFET high-side Power Switch IC for USB application. Low switch-on resistance and low supply current are realized in this IC.

The RT9742 integrates an over-current protection circuit, a short fold back circuit, a thermal shutdown circuit and an under-voltage lockout circuit for overall protection. Besides, a flag output is available to indicate fault conditions to the local USB controller. Furthermore, the chip also integrates an embedded delay function to prevent miss-operation from happening due to inrush-current. The RT9742 is an ideal solution for USB power supply and can support flexible applications since it is available in TSOT-23-5, TSOT-23-5 (FC) and SOT-23-3 package.

Applications

  • USB Peripherals
  • Notebook PCs
Key Spec.
RT9742A RT9742B RT9742C RT9742D RT9742E RT9742F RT9742G RT9742H RT9742J RT9742K RT9742L RT9742M RT9742N RT9742P RT9742Q RT9742R RT9742S RT9742U RT9742V
Status Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active
Number of Outputs 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Vin (min) (V) 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7
Vin (max) (V) 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
Ron (typ) (mOhm) 55 55 55;70 55;70 55;70 55;70 55;70 55;70 70 70 70 70 55;70 55 70 70 70 70 70
Iq (typ) (mA) 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
Current Limit (typ) (A) 3.3 3.3 2.2 2.2 1.65 1.65 1.1 1.1 2.15 1.65 1.1 1.65 2.75 2.75 0.7 0.7 0.7 1.65 2.2
FLAG Indicator Yes Yes Yes Yes Yes Yes Yes Yes No No No Yes Yes Yes Yes Yes No Yes Yes
Iocp Adjustable No No No No No No No No No No No No No No No No No No No
Safety Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL
Switch Type Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch
Features Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP
Package Type TSOT-25(FC) TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) SOT-23 SOT-23 SOT-23 TSOT-25 TSOT-25(FC) TSOT-25(FC) TSOT-25 TSOT-25 SOT-23 TSOT-25 TSOT-25
Features
  • 70mΩ/55mΩ (typ.) N-MOSFET Switch
  • Operating Range : 2.7V to 6V
  • Reverse Blocking Current
  • Under Voltage Lockout
  • Deglitched Fault Report (FLG)
  • Thermal Protection with Fold-back
  • Over Current Protection
  • Short Circuit Protection
  • UL Approved-E219878
  • Nemko Approved-NO109777
Datasheet
TitleLast UpdateDownload
70mΩ/55mΩ, 3A/2.5A/2A/1.5A/1A/0.5A High-Side Power Switches with Flag2017/10/30
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Analyzing VIN overstress in Power ICs App. Note2016/07/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9742AGJ5FTSOT-25(FC)3000 Request Buy from Distributor
RT9742ANGJ5FTSOT-25(FC)3000 Request Buy from Distributor
RT9742BGJ5FTSOT-25(FC)3000 Request Buy from Distributor
RT9742CGJ5TSOT-253000 Request Buy from Distributor
RT9742CGJ5FTSOT-25(FC)3000 Request Buy from Distributor
RT9742DGJ5TSOT-253000 Request Buy from Distributor
RT9742EGJ5TSOT-253000 Request Buy from Distributor
RT9742FGJ5TSOT-253000 Request Buy from Distributor
RT9742GGJ5TSOT-253000 Request Buy from Distributor
RT9742QGJ5TSOT-253000 Request Buy from Distributor
RT9742QNGJ5TSOT-253000 Request Buy from Distributor
RT9742SNGVSOT-233000 Request Buy from Distributor
RT9742UNGJ5TSOT-253000 Request Buy from Distributor
RT9742VGJ5TSOT-253000 Request Buy from Distributor
Please confirm with our distributor or sales representative for actual stock status.
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