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Maxim > Products > Analog Switches and Multiplexers 
MAX4789, MAX4790, MAX4791, MAX4792, MAX4793, MAX4794
200mA/250mA/300mA Current-Limit Switches


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Data Sheet
FULL DATA SHEET (PDF, 332kB)
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Description
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 FLAG-bar 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.

Key Features   Applications/Uses
  • 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 Switches
    Part Number Current Limit (mA) Functions Max. Load Current (A) RON (typ) (Ω) Switch Op. Voltage Range (V) Fault Indicator Fault Blanking Timeout (ms) RoHS Available Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX4789  200
    •FLAG function
    •Fault Blanking
    		 0.2 0.2 2.3 to 5.5 Yes 14 Yes SOT-143/4
    SOT-23/5
    THIN QFN (Dual)/6     		8 -40 to +85 $0.70 @ 1k
    MAX4790  200
    •Auto Retry
    •Fault Blanking
    		 0.2 0.2 No Yes SOT-143/4
    THIN QFN (Dual)/6     		-40 to +85 $0.78 @ 1k
    MAX4791  250
    •FLAG function
    •Fault Blanking
    		 0.25  -  Yes Yes SOT-143/4
    SOT-23/5
    THIN QFN (Dual)/6     		-40 to +105
    -40 to +85     		$0.70 @ 1k
    MAX4792  250
    •Auto Retry
    •Fault Blanking
    		 0.25 0.2 No No SOT-143/4
    THIN QFN (Dual)/6     		-40 to +85 $0.78 @ 1k
    MAX4793  300
    •FLAG function
    •Fault Blanking
    		 0.3 0.2 Yes Yes SOT-143/4
    SOT-23/5
    THIN QFN (Dual)/6     		-40 to +85 $0.78 @ 1k
    MAX4794  300
    •Auto Retry
    •Fault Blanking
    		 0.3 0.2 No Yes SOT-143/4
    THIN QFN (Dual)/6     		-40 to +85 $0.78 @ 1k
    See All Current Limit Switches (27)
    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 prices and delivery, please see the price and availability page or contact an authorized distributor.

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

    Application Notes
  		• Application Note 3936: The Maxim USB Laboratory - MAX4793

    Evaluation Kits
    none

    Design Guides
  		• MUX & SWITCH (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Reliability Report: MAX4790EUS.pdf
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-47 of 47

    MAX4789 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4789EUS  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4789EUS-T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4789EUK+  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4789EUK+T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4789EUK  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4789EUK-T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4789ETT+T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4789ETT+  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4789ETT  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4789ETT-T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4790 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4790EUS  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4790EUS+  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4790EUS-T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4790EUS+T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4790ETT  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4790ETT-T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4791 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4791EUS  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4791EUS-T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4791EUK/V+T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C See data sheet
    Materials Analysis
    MAX4791EUK+  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4791EUK+T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4791BEUK/V+  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4791BEUK/V+T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4791EUK  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4791EUK-T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4791ETT  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4791ETT-T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4792 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4792EUS  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4792EUS-T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4792ETT  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4792ETT-T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4793 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4793EUS  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4793EUS-T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4793EUK+  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4793EUK  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4793EUK+T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4793EUK-T  
    		SOT-23;5 pin;9 mm²
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4793ETT  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4793ETT-T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4794 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4794EUS+  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4794EUS  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4794EUS+T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4794EUS-T  
    		SOT-143;4 pin;8 mm²
    Dwg: 21-0052F (PDF)
    Use pkgcode/variation: U4-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4794ETT+  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4794ETT+T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4794ETT  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4794ETT-T  
    		THIN QFN (Dual);6 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T633-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    Related Products
    MAX4785, MAX4786, MAX4787, MAX4788 50mA/100mA Current-Limit Switches

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    •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

    		 Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

    		 Price and Availability 
     Samples 
     Buy Online 
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     Notes and Comments 
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    Document Ref.: 19-2663; Rev 2; 2005-03-02
    This page last modified: 2007-08-02




             


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