Maxim > Products > Analog Switches and Multiplexers > MAX4943, MAX4944, MAX4944L, ...

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
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Status Explanations for product status codes

Part Number Status
MAX4943 Active: In Production. See Ordering Information for details.
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

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.
 

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 164kB)
Send this datasheet to any email addressE-Mail

Key Features

  • 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
 

Applications/Uses

  • Cell Phones
  • Digital Still Cameras
  • MP3 Players
  • PDAs and Palmtop Devices
   

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)		 Package/Pins Budgetary Price
min max See Notes
MAX4944  1 2.2 28 6.35 4.15 Open-Drain 30.2 2
µDFN/8
 $1.20 @1k
MAX4945  5.8 4.15
µDFN/8
 $1.20 @1k
MAX4946  4.56 2.45
µDFN/8
 $1.62 @1k
MAX4949  8.9 2.45
µDFN/8
 $1.35 @1k
See All Overvoltage Protection Controllers (60)
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 prices and delivery, please see the price and availability page or contact an authorized distributor.


Diagram

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

Product Guides

Signal Routing & Protection (PDF)

Reliability Reports

Reliability Report: MAX4946.pdf MAX4949.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

none

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX4943ELA+  
Active   µDFN;8 pin;4.2 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+T     N/A No Longer Available MAX4944ELA+T

 		 µDFN;8 pin;4.2 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   uDFN;

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX4944ELA+  
Active   µDFN;8 pin;4.2 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;4.2 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;4.2 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+T    
Active   µDFN;8 pin;4.2 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;4.2 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+T    
Active   µDFN;8 pin;4.2 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   uDFN;

Land Pattern: Not Available

-40°C to +85°C See data sheet
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX4945ELA+  
Active   µDFN;8 pin;4.2 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;4.2 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;4.2 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+T    
Active   µDFN;8 pin;4.2 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+  
Active   µDFN;8 pin;4.2 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;4.2 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+    
Active   µDFN;8 pin;4.2 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;4.2 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

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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More Information

Topmark Coding MAX4943
Topmark Coding MAX4944
Topmark Coding MAX4945
Topmark Coding MAX4946
Topmark Coding MAX4949
New Product Press Release [ 2007-08-02 ]


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Document Ref.: 19-0552 Rev 3; 2008-09-23
This page last modified: 2011-03-28

 


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