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Dual Channel Precision Adjustable Current Limited Power Switch

RT9731A/RT9731B

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The RT9731A/B is a dual channel power distribution switch intended for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. This device offers a programmable current limit threshold between 560mA and 2.8A (typ.) per channel via an external resistor. The power-switch's rising and falling times are controlled to minimize current surges during on/off transitions.

Each channel of the RT9731A/B limits the output current to a safe level by switching into constant-current mode whenever the output load exceeds the current limit threshold. The FLAG logic output of each channel independently asserts low during over current.

The RT9731A/B is available in a thin WDFN-10L 3x3 package.

Applications

  • USB Ports/Hubs
  • Digital TV
  • Set-Top Boxes
  • VOIP Phones
Key Spec.
RT9731A RT9731B
Status Active Active
Number of Outputs 2 2
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
Ron (typ) (mOhm) 44 44
Iq (typ) (mA) 0.13 0.13
Current Limit (typ) (A) 2.8 2.8
FLAG Indicator Yes Yes
Iocp Adjustable Yes Yes
Safety Nemko;UL Nemko;UL
Switch Type Power Switch Power Switch
Features Adjustable Current Limit;Cycle-by-Cycle Current Limit;Enable Input;SCP Adjustable Current Limit;Cycle-by-Cycle Current Limit;Enable Input;SCP
Package Type WDFN3x3-10 WDFN3x3-10
Features
  • 2.5V to 5.5V Input Voltage Range
  • Two Separate Current Limiting Channels
  • Meets USB Current Limiting Requirements
  • Adjustable Current Limit from 560mA to 2.8A
  • ±7.5% Current Limit Accuracy at 2.8A
  • Two 44mΩ High Side MOSFETs
  • 2μA Maximum Standby Supply Current
  • Built-in Soft-Start
  • Thin 10-Lead WDFN Package
  • UL Approved-E219878
  • Nemko Approved-NO65969
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
Dual Channel Precision Adjustable Current Limited Power Switch2012/02/16
Reliability
Title Last Update ShareDownload
Dual Channel Precision Adjustable Current Limited Power Switch 2017/02/07
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9731AZQW(2)WDFN3x3-101500 Not available Buy from Distributor
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