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Triple USB Switch with Autoreset and Fault Blanking

Product Details

Key Features

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 700
Current Limit (mA) (max) 700
# Power Switches 3
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 26
Current Limit Set By Preset
RON (Ω) (typ) 0.085
VSUPPLY (V) (min) 4
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins QSOP/16
Budgetary
Price (See Notes)
1.49
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Simplified Block Diagram

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Parameters

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 700
Current Limit (mA) (max) 700
# Power Switches 3
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 26
Current Limit Set By Preset
RON (Ω) (typ) 0.085
VSUPPLY (V) (min) 4
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins QSOP/16
Budgetary
Price (See Notes)
1.49

Key Features

  • Triple USB Switch in Tiny 16-Pin QSOP Package
  • Autoreset Feature Saves System Power
  • Guaranteed 500mA Load Current per Channel
  • Built-In 20ms Fault-Blanking Circuitry
  • Active-High/Active-Low Control Logic
  • Fully Compliant to USB Specifications
  • 4V to 5.5V Input Voltage Range
  • Independent Shutdown Control
  • Independent Fault Indicator Outputs
  • Thermal-Overload Protection
  • 3µA Standby Current

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Docking Stations
  • Notebook Computers
  • PDAs and Palmtop Computers
  • USB Hubs
  • USB Ports

Description

The MAX1940 triple current-limited switch with auto-reset supplies a guaranteed 500mA load per channel in accordance with USB specifications. The MAX1940 operates from a 4V to 5.5V input supply and consumes only 60µA of quiescent current when operating and only 3µA in standby. Selectable active-high/active-low control logic and independent shutdown controls for each channel provide additional flexibility. An autoreset feature latches the switch off in the event of a short circuit, saving system power. The switch reactivates upon removal of the shorted condition.

The MAX1940 provides several safety features to protect the USB port. Built-in thermal-overload protection turns off the switch when the die temperature exceeds +160°C. Accurate internal current-limiting circuitry protects the input supply against both overload and short-circuit conditions. Independent open-drain fault signals (active-low FAULTA, active-low FAULTB, and active-low FAULTC) notify the microprocessor when a thermal-overload, current-limit, undervoltage lockout (UVLO), or short-circuit fault occurs. A 20ms fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, preventing false alarms to the host system. The fault-blanking feature also prevents fault signals from being issued when the device powers up the load.

The MAX1940 is available in a space-saving 16-pin QSOP package and operates over the extended (-40°C to +85°C) temperature range.

Simplified Block Diagram

MAX1940: Typical Operating Circuit MAX1940: 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.