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1A Current-Limited Switch for 2 USB Ports

Product Details

Key Features

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 1400
Current Limit (mA) (max) 1400
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 20
Current Limit Set By Preset
RON (Ω) (typ) 0.07
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
TDFN/10
Budgetary
Price (See Notes)
1.1
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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) 1400
Current Limit (mA) (max) 1400
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 20
Current Limit Set By Preset
RON (Ω) (typ) 0.07
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
TDFN/10
Budgetary
Price (See Notes)
1.1

Key Features

  • Accurate Current Limit (1.4A min, 2.1A max)
  • 10ms Internal Active-Low OC Blanking Timeout
  • Active-Low OC Blanking During Power-Up
  • 125mΩ max High-Side MOSFET
  • Short-Circuit and Thermal Protection with Overcurrent Logic Output
  • Undervoltage Lockout
  • 16µA Quiescent Supply Current
  • 1µA (max) Standby Supply Current
  • 2.7V to 5.5V Supply Range
  • UL® Recognized: UL# E211395

Applications/Uses

  • Docking Stations
  • Notebook Computers
  • USB Hubs
  • USB Ports

Description

The MAX1922 current-limited 70mΩ switch with built-in fault blanking provides an accurate, preset 1.4A to 2.1A current limit, making it ideal for dual USB applications. Its low quiescent supply current (16µA) and standby current (1µA) conserve battery power in portable applications. The MAX1922 operates with inputs from 2.7V to 5.5V, making it ideal for both 3V and 5V systems.

An overcurrent signal (active-low OC) notifies the microprocessor that the internal current limit has been reached. A 10ms overcurrent-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 blanking also prevents an active-low OC signal from being issued when the device is powering up.

The MAX1922 has several safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. The device also has accurate internal current-limiting circuitry to protect the input supply against overload.

The MAX1922 is offered in a space-saving 8-pin SO package and a 10-pin TDFN package and operates over the extended (-40°C to +85°) temperature range.

Simplified Block Diagram

MAX1922: Typical Operating Circuit MAX1922: 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 .