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Current-Limited Switch for Single USB Port

Product Details

Key Features

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 750
Current Limit (mA) (max) 750
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 25
Current Limit Set By Preset
RON (Ω) (typ) 0.06
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
0.88
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Simplified Block Diagram

Technical Docs

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Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 750
Current Limit (mA) (max) 750
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 25
Current Limit Set By Preset
RON (Ω) (typ) 0.06
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
0.88

Key Features

  • 0.5A Guaranteed Output Current
  • Guaranteed 0.75A Short-Circuit Protection
  • 10ms Internal Fault-Blanking Timeout
  • No Fault Signal During Power-Up
  • Thermal Shutdown Protection
  • 2.7V to 5.5V Supply Range
  • 14µA Supply Current
  • Small 10-Pin µMAX Package
  • Applications/Uses

    • Battery Chargers
    • Docking Stations
    • Hot Plug-In Power Supplies
    • Notebook Computers
    • Portable Equipment
    • USB Ports and Hubs

    Description

    The MAX1931 is a current-limited, 60mΩ switch with built-in fault blanking. Its accurate preset current limit of 0.64A to 1.06A makes it ideally suited for USB applications. The device's low quiescent supply current (14µA) and shutdown current (1µA) conserve battery power in portable applications. The MAX1931 operates with inputs from 2.7V to 5.5V, making it ideal for both 3V and 5V systems.

    A fault signal notifies the microprocessor that the internal current limit has been reached. A 10ms fault-blanking feature allows momentary faults (such as those caused when hot-swapping into a capacitive load) to be ignored, thus preventing false alarms to the host system. This fault blanking also prevents a fault signal from being issued when the device is powering up.

    In the MAX1931, an output overcurrent condition causes the switch to current limit at 0.64A to 1.06A and active-low FAULT to go low after the 10ms blanking period. When the overcurrent condition is removed, active-low FAULT returns to its high-impedance state.

    The MAX1931 has several safety features to ensure that the USB port is protected. Built-in thermal overload protection limits power dissipation and junction temperatures. The device has an accurate internal current-limiting circuitry to protect the input supply against overload. The MAX1931 is available in a space-saving 10-pin µMAX package.

    Simplified Block Diagram

    MAX1931: Typical Operating Circuit MAX1931: Typical Operating Circuit Zoom icon

    Technical Docs

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

    Sampling:
    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.