Express Card Power Interface Switch


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The RT9725A/B power distribution switches are designed to fulfill power management requirements of Express Card specification. The RT9725A/B supports systems with single slot ExpressCard|34 and ExpressCard|54 socket. The device distributes 3.3V, AUX and 1.5V to the Express Card socket. Each power rail is protected with current limit circuitry when output load exceeds over-current threshold or short-circuits occurs. A thermal protection circuit turns off switches to prevent the device from damage when power dissipation is increased by continuous heavy overloads or short-circuits in the switches. The RT9725A/B is available in WQFN-20L 3x3 package.


  • PCs
  • PDAs
  • Digital Cameras
  • TV and Set Top Boxes
  • Notebooks
Key Spec.
RT9725A RT9725B
Status Active Active
Number of Outputs 3 3
Vin (min) (V) 1.35;3;3 1.35;3;3
Vin (max) (V) 1.65;3.6;3.6 1.65;3.6;3.6
Ron (typ) (mOhm) 120;90;90 120;90;90
Iq (typ) (mA) 0.025;0.025;0.25 0.025;0.025;0.25
Current Limit (typ) (A) 1.2 1.2
FLAG Indicator Yes Yes
Iocp Adjustable No No
Safety ExpressCard ExpressCard
Switch Type Power Switch Power Switch
Features Cycle-by-Cycle Current Limit;Enable Input;SCP Cycle-by-Cycle Current Limit;Enable Input;SCP
Package Type WQFN3x3-20 WQFN3x3-20
  • Meets Express Card Standard (ExpressCard|34 and ExpressCard|54)
  • Compliant with the Express Card Compliance Check Lists, Compliance ID:EC100328
  • Fully Satisfy the Express Card Implementation Guidelines
  • Supports Systems with WAKE Function
  • TTL-Logic Compatible Input
  • Under-Voltage Lockout Protection
  • Over Current Protection
  • Over Temperature Protection
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Express Card Power Interface Switch2009/11/05
Title Last Update ShareDownload
Express Card Power Interface Switch 2015/05/19