MAX1922

1A Current-Limited Switch for 2 USB Ports


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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.
MAX1922: Typical Operating Circuit MAX1922: Typical Operating Circuit Enlarge+

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

See parametric specs for Current Limit and USB Power Switches (80)


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
MAX1922 Yes114001400Yes20Preset0.072.75.5-40 to +85
SOIC (N)/8
TDFN/10
$1.04 @1k

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.
Product Reliability Reports: MAX1922.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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 >
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