ENGLISH 简体中文 日本語 한국어  

    Login | Register 


   
 
Enter keywords or part number    



MAX1946
Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN

Smallest Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN Package


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 344kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
The MAX1946 single current-limited switch with auto-reset supplies a guaranteed 500mA load in accordance with USB specifications. The MAX1946 operates from a 2.7V to 5.5V input supply and consumes only 40µA of quiescent current when operating and only 3µA in shutdown. Selectable active-high/active-low control logic and shutdown control 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 MAX1946 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. An open-drain fault signal, (active-low FAULT), notifies the microprocessor (µP) 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 prevents fault signals from being issued when the device powers up the load.

The MAX1946 is available in a space-saving 8-pin TDFN package and operates over the extended (-40°C to +85°C) temperature range.

Key Features   Applications/Uses
  • Single USB Switch in 3mm x 3mm Package
  • Autoreset Feature Saves System Power
  • Guaranteed 500mA Load Current
  • Built-In 20ms Fault-Blanking Circuitry
  • Active-High or Active-Low Control Logic
  • Fully Compliant to USB Specifications
  • 2.7V to 5.5V Input Voltage Range
  • Fault-Indicator Output
  • Thermal-Overload Protection
  • UL Certification Pending

 
  • Digital Cameras
  • Docking Stations
  • Notebook and Desktop Computers
  • PDAs and Palmtop Computers
  • USB Ports and USB Hubs

    Key Specifications:  USB Power Switches
    Part Number Functions Switches ILOAD
    (A)
    RON
    (Ω)
    Fault Indicator Fault Blanking Timeout
    (ms)
    VIN
    (V)
    Package/Pins Smallest Available Pckg.
    (mm2)
    Oper. Temp.
    (°C)
    Price
    max typ max w/pins See Notes
    MAX1946  Active High/Active Low Control Logic 1 0.5 0.075 Yes 20 2.7 to 5.5
    TDFN-EP/8
    10 -40 to +85 $0.58 @1k
    See All USB Power Switches (28)

    Diagram
    MAX1946: Typical Operating Circuit
    Typical Operating Circuit

    Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help
  •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

     Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

     Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

     Related Products 
     Notes and Comments 
     Evaluation Kits 

    Document Ref.: 19-2550; Rev 2; 2007-04-10
    This page last modified: 2007-07-13


            •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products