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Maxim > Products > [Analog Switches and Multiplexers] 
MAX4943*, MAX4944, MAX4944L, MAX4945, MAX4945L, MAX4946, MAX4949
Overvoltage-Protection Controllers with Internal FET

Provide Input Voltage Protection Up to +28V without Requiring an External nFET

*Future Product
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    •   QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
    Status
    Part Number Status
    MAX4943 Active: In Production.
    MAX4944 Active: In Production.
    MAX4944L Active: In Production.
    MAX4945 Active: In Production.
    MAX4945L Active: In Production.
    MAX4946 Active: In Production.
    MAX4949 Active: In Production.

    Description
    Request Full Data Sheet
    The MAX4943–MAX4946/MAX4949 family of overvoltage-protection devices feature a low 80mΩ (typ) RON internal FET and protect low-voltage systems against voltage faults up to +28V. These devices also drive an optional external pFET to protect down to -28V when connected to a load with reverse current protection. When the input voltage exceeds the overvoltage threshold, the internal FET is turned off to prevent damage to the protected components.

    All switches feature a minimum 1.2A current-limit protection. During a short-circuit occurrence, the MAX4944B and MAX4945B place the switch in a latchoff state where the switch turns off and remains off. For the autoretry devices, the switch turns off and continuously checks after a 15ms (typ) retry time.

    The overvoltage thresholds (OVLO) are preset to 7.4V, 6.35V, 5.8V, 4.56V, or 8.9V. The undervoltage-lockout (UVLO) thresholds are preset to 2.45V and 4.15V. When the input voltage drops below the undervoltagelockout (UVLO) threshold, the devices enter a lowcurrent standby mode. (See the Ordering Information/Selector Guide in the full data sheet for more details on UVLO/OVLO).

    All devices are offered in a small, 8-pin µDFN (2mm x 2mm) package and are specified for operation over the -40°C to +85°C temperature range.

    Key Features   Applications/Uses
    • Input Voltage Protection Up to +28V
    • Integrated nFET Switch
    • Preset Overvoltage Protection Trip Level
      • 7.40V (MAX4943)
      • 6.35V (MAX4944_)
      • 5.80V (MAX4945_)
      • 4.56V (MAX4946)
      • 8.90V (MAX4949)
    • Low-Current Undervoltage-Lockout Mode
    • Short-Circuit Protection (Latchoff/Autoretry)
    • Internal 15ms (typ) Startup Delay and Retry Times
    • Input Voltage Power-Good Logic Output
    • Thermal-Shutdown Protection
    • Small, 8-Pin (2mm x 2mm) µDFN Package

    		 
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    Key Specifications:  Overvoltage Protection Controllers
    Part Number Channels VIN
    (V)    		 VIN
    (V)    		 Over Voltage Trip Level
    (V)    		 Under Voltage Lockout
    (V)    		 Over Volt. Flag tGATE (On)
    (ms)    		 tGATE (Off)
    (µs)    		 Features Package/Pins Price
    min max See Notes
    MAX4944  1 2.2 28 6.35 4.15 Open-Drain 30.2 2
    Auto Retry
    Internal Charge Pump
    Internal Current-Limit Switch
    µDFN/8
    		 $1.20 @1k
    MAX4945  5.8 4.15
    µDFN/8
    		 $1.20 @1k
    MAX4946  4.56 2.45
    µDFN/8
    		 $1.20 @1k
    MAX4949  8.9 2.45
    µDFN/8
    		 $1.00 @1k
    See All Overvoltage Protection Controllers (47)

    Diagram
    MAX4943, MAX4944, MAX4944L, MAX4945, MAX4946, MAX4949: Typical Operating Circuit
    Typical Operating Circuit

    Design Guides
  		• Signal Routing & Protection (PDF)

    Reliability Reports
  		• Reliability Report: MAX4949.pdf
  		• Show FIT data for:
  		• 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: 1-18 of 18

    MAX4943 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4943ELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4943ELA+  
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4944 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4944ELA+  
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4944ELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4944BELA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX4944L Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4944LELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4944LELA+  
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4945 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4945AELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4945ELA+  
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4945ELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4945AELA+  
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4945BELA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX4945L Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4945LELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4945LELA+    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4946 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4946ELA+  
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4946ELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4949 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4949ELA+    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4949ELA+T    
    		Active µDFN;8 pin;4 mm²
    Outline Drawing: 21-0164 (PDF)
    Land Pattern: 90-0005 (PDF)
    Use pkgcode/variation: L822+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX4943 MAX4944 MAX4945 MAX4946 MAX4949
  		• New Product Press Release 2007-08-02 
  		• Product Ad: Download

    Related Products
    MAX4843, MAX4844, MAX4845, MAX4846 Overvoltage Protection Controllers with Low Standby Current

    More Like This: View Product Families for Similar Products

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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 
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    Document Ref.: 19-0552; Rev 3; 2008-09-23
    This page last modified: 2008-09-23


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