MAX1823H

Dual USB Switch with Fault Blanking and Autoreset


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Description

The MAX1823 is a dual, current-limited switch with autoreset specifically made for USB applications. The autoreset feature latches the switch off if the output is shorted, saving system power. The switch reactivates when the short circuit is removed. Each channel is guaranteed to supply 720mA and meet USB specifications. Low quiescent supply current (50µA) and standby current (3µA) conserve battery power in portable applications.

The MAX1823 has multiple safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. Accurate internal current-limiting circuitry protects the input supply against both overload and short-circuit conditions. Independent fault signals (active-low FAULTA and active-low FAULTB) notify the microprocessor (µP) when a thermal-overload, current-limit, undervoltage-lockout (UVLO), or short-circuit fault occurs. A 20ms fault-blanking feature ignores momentary faults, such as those caused when hot swapping a capacitive load, preventing false alarms to the host system. The MAX1823A/MAX1823B also block reverse current (current from OUT_ to IN_) while in shutdown.

The MAX1823 is available in a space-saving 10-pin µMAX® package. The MAX1823/MAX1823A are enabled with an active-low signal, and the MAX1823B/MAX1823H are enabled with an active-high signal. For a single version of this device, refer to the MAX1946 data sheet. For a triple version, refer to the MAX1940 data sheet.
MAX1823, MAX1823A, MAX1823B, MAX1823H: Functional Diagram MAX1823, MAX1823A, MAX1823B, MAX1823H: Functional Diagram Enlarge+

Key Features

  • Dual USB Switch in Tiny 10-Pin µMAX Package
  • Autoreset Feature Saves Power
  • Guaranteed 720mA Load per Channel
  • Built-In 20ms Fault Blanking
  • Compliant to USB Specification
  • Blocks Reverse Current in Shutdown (MAX1823A/MAX1823B)
  • 4V to 5.5V Input Voltage Range
  • Independent Shutdown Control
    • (MAX1823/MAX1823A—Active Low)
    • (MAX1823B/MAX1823H—Active High)
  • Independent active-low FAULT Indicator Outputs
  • Thermal-Overload Protection
  • 50µA Quiescent Current (Both Switches On)
  • 3µA Standby Current

Applications/Uses

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

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
MAX1823A Yes2720720Yes25Preset0.07545.5-40 to +85
SOIC(N)/8
$1.10 @1k
MAX1823B 
SOIC(N)/8
$1.21 @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.
Request Reliability Report for: MAX1823H 
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.

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