50mA/100mA Current-Limit Switches

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The MAX4785-MAX4788 family of switches feature internal current limiting to prevent host devices from being damaged due to faulty load conditions. These analog switches have a low 0.7Ω on-resistance and operate from a 2.3V to 5.5V input voltage range. They are available with guaranteed 50mA and 100mA current limits, making them ideal for load-switching applications.

When the switch is on and a load is connected to the port, a guaranteed blanking time of 14ms ensures that the transient voltages settle down. If after this blanking time the load current is greater than the current limit, the MAX4785 and MAX4787 enter a latch-off state where the switch is turned off and active-low FLAG is issued to the microprocessor. The switch can be turned on again by cycling the power or the ON pin.

The MAX4786 and MAX4788 have an autoretry feature where the switch turns off after the blanking time and then continuously checks to see if the overload condition is present. The switch remains on after the overload condition disappears.

The MAX4785 and MAX4787 are available in a tiny space-saving 4-pin or 5-pin SC70 package. The MAX4786 and MAX4788 are available only in the 4-pin SC70 package. For higher current current-limiting switches, refer to the MAX4789-MAX4794 and MAX1693 data sheets.
MAX4785, MAX4786, MAX4787, MAX4788: Functional Diagram MAX4785, MAX4786, MAX4787, MAX4788: Functional Diagram Enlarge+

Key Features

  • Guaranteed Current Limit: 50mA, 100mA
  • Thermal-Shutdown Protection
  • Reverse-Current Protection
  • 0.7Ω On-Resistance
  • 14ms Guaranteed Blanking Time
  • FLAG-bar Function (MAX4785/MAX4787)
  • 65µA Supply Current
  • 8µA Latch-Off Current (MAX4785/MAX4787)
  • 0.01µA Shutdown Current
  • 2.3V to 5.5V Supply Range
  • Undervoltage Lockout
  • Fast Current-Limit Response Time
  • Tiny SC70 Package
  • Applications/Uses

    • Cell Phones
    • Global Positioning Systems (GPS)
    • Handheld Devices
    • PDAs and Palmtop Devices

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

    Part NumberPower SwitchesCurrent Limit
    Current Limit
    Fault IndicatorCurrent Limit Accuracy
    Current Limit Set ByRON
    Oper. Temp.
    minmaxtypminmaxSee Notes
    MAX4785 15050Yes41Preset0.72.35.5-40 to +85
    $1.48 @1k
    MAX4786 5050No
    MAX4787 100100Yes
    $1.48 @1k
    MAX4788 100100No
    $1.96 @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: MAX4788.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.

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