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


Please check latest availability status for a specific part variant.

Description

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 (3mm x 3mm) TDFN package and operates over the extended (-40°C to +85°C) temperature range.
MAX1946: Typical Operating Circuit MAX1946: Typical Operating Circuit Enlarge+

Key Features

  • 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

Applications/Uses

  • Digital Cameras
  • Docking Stations
  • Notebook and Desktop Computers
  • PDAs and Palmtop Computers
  • USB Ports and USB Hubs
Part NumberUSBPower SwitchesCurrent Limit
(mA)
Current Limit
(mA)
Fault IndicatorCurrent Limit Accuracy
(%)
Current Limit Set ByRON
(Ω)
VSUPPLY
(V)
VSUPPLY
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxtypminmaxSee Notes
MAX1946 Yes1740740Yes24Preset0.0752.75.5-40 to +85
TDFN/8
$0.61 @1k
See All Current Limit and USB Power Switches (82)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Product Reliability Reports: MAX1946.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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