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Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN

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

Product Details

Key Features

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 740
Current Limit (mA) (max) 740
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 24
Current Limit Set By Preset
RON (Ω) (typ) 0.075
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/8
Budgetary
Price (See Notes)
0.7
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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) 740
Current Limit (mA) (max) 740
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 24
Current Limit Set By Preset
RON (Ω) (typ) 0.075
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/8
Budgetary
Price (See Notes)
0.7

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

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.

Simplified Block Diagram

MAX1946: Typical Operating Circuit MAX1946: 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.