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MAX4789, MAX4790, MAX4791, MAX4792, MAX4793, MAX4794

200mA/250mA/300mA Current-Limit Switches

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Status Explanations for product status codes

Part Number Status
MAX4789 Active: In Production.
MAX4790 Active: In Production.
MAX4791 Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information.
MAX4792 Active: In Production.
MAX4793 Active: In Production.
MAX4794 Active: In Production.


The MAX4789–MAX4794 family of switches feature internal current limiting to prevent damage to host devices due to faulty load conditions. These analog switches have a low 0.2Ω on-resistance and operate from 2.3V to 5.5V input voltage range. They are available with guaranteed 200mA, 250mA, and 300mA current limits, making them ideal for SDIO and other 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 MAX4789, MAX4791, and MAX4793 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 MAX4790, MAX4792, and MAX4794 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 MAX4789-MAX4794 are available in 6-pin 3mm x 3mm TDFN and tiny space-saving 4-pin SOT143 packages. The MAX4789/MAX4791/MAX4793 are also available in a tiny 5-pin SOT23 package. For lower current current-limiting switches, refer to the MAX4785-MAX4788 data sheet.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 188kB)
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Key Features

  • Guaranteed Current Limit: 200mA, 250mA, 300mA
  • Thermal-Shutdown Protection
  • Reverse Current Protection
  • 0.2Ω On-Resistance
  • 14ms Guaranteed Blanking Time
  • Active-Low FLAG Function (MAX4789/MAX4791/MAX4793)
  • 80µA Supply Current
  • 8µA Latch-Off Current (MAX4789/MAX4791/MAX4793)
  • 0.01µA Shutdown Current
  • 2.3V to 5.5V Supply Range
  • Undervoltage Lockout
  • Fast Current-Limit Response Time (5µs)
  • TDFN and SOT23/SOT143 Packages


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

Key Specifications:

Current Limit and USB Power Switches
Part Number Power Switches Current Limit
Current Limit
Fault Indicator Current Limit Accuracy
Current Limit Set By RON
Oper. Temp.
Min. Max. typ min max See Notes
MAX4789  1 200 200 Yes 20 Preset 0.2 2.3 5.5 -40 to +85 $1.44 @1k
MAX4790  200 200 No -40 to +85 $1.20 @1k
MAX4791  250 250 Yes
-40 to +85
-40 to +105
MAX4792  250 250 No -40 to +85 -
MAX4793  300 300 Yes -40 to +85 $1.44 @1k
MAX4794  300 300 No -40 to +85 $1.20 @1k
See All Current Limit and USB Power Switches (83)

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.


MAX4789, MAX4790, MAX4791, MAX4792, MAX4793, MAX4794: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding MAX4789
Topmark Coding MAX4790
Topmark Coding MAX4791
Topmark Coding MAX4792
Topmark Coding MAX4793
Topmark Coding MAX4794

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Document Ref.: 19-2663 Rev 3; 2008-12-15
This page last modified: 2008-12-16