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MAX8555, MAX8555A
Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers


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Data Sheet
FULL DATA SHEET (PDF, 432kB)
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Description
Critical loads often employ parallel-connected power supplies with redundancy to enhance system reliability. The MAX8555/MAX8555A are highly integrated, inexpensive MOSFET controllers that provide isolation and redundant power capability in high-reliability systems. The MAX8555/MAX8555A are used in 0.5V to 3.3V systems, and have an internal charge pump to drive the gates of the N-channel pass elements to (VCS+ + 5V).

During startup, the MAX8555/MAX8555A monitor the voltage drop across the external MOSFETs. Once VCS+ approaches or exceeds the bus voltage (VCS-), the MOSFETs are turned on. The MAX8555/MAX8555A feature a dual-purpose TIMER input. A single external resistor from TIMER to ground sets the turn-on speed of the external MOSFETs. Optionally, the TIMER input can be used as a logic enable input. Once the external MOSFET is turned on, these controllers monitor the load, protecting the bus against overvoltage, undervoltage, and reverse-current fault conditions. The MAX8555 is available with a 40mV reverse-current threshold, while the MAX8555A is available with a 20mV reverse-current threshold.

Overvoltage and undervoltage fault thresholds are adjustable and can be disabled. The current-limit trip points are set by the external MOSFETs' RDS(ON), reducing component count. An open-drain, logic-low fault output indicates if an overvoltage, undervoltage, or reverse-current fault occurs. The MAX8555 and the MAX8555A can shut down in response to a reverse-current fault condition as quickly as 200ns.

Both devices come in space-saving 10-pin µMAX or TDFN packages and are specified over the extended -40°C to +85°C temperature range.

Key Features   Applications/Uses
  • Simple, Integrated, and Inexpensive MOSFET Controllers
  • ORing FET Drive for 0.5V to 3.3V
  • Eliminate ORing Diode Power Dissipation
  • Provide N+1 Redundant Supply Capability for Highly Reliable Systems
  • Isolate Failed Short-Circuit Supply from Output BUS
  • Respond to Reverse Short-Circuit Current in 200ns
  • Adjustable Blank Time
  • Programmable Soft-Start
  • Logic Enable Input
  • Adjustable Overvoltage and Undervoltage Trip Points
  • Fault-Indicator Output
  • Space-Saving Packages

 
  		• Point-of-Load Supplies
  		• Power-Supply Modules
  		• Rectifiers
  		• Redundant Power Supplies in High-Availability Systems
  		• Servers
  		• Telecom Power Supplies

    Diagram
    MAX8555, MAX8555A: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX8555AEVKIT

    Reliability Reports
  		• 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: 1-12 of 12

    MAX8555 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8555ETB  
    		TDFN-EP;10 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0003 (PDF)
    Use pkgcode/variation: T1033-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555ETB-T  
    		TDFN-EP;10 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0003 (PDF)
    Use pkgcode/variation: T1033-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555EUB  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555EUB-T  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555EUB+  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8555EUB+T  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8555A Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8555AETB    
    		TDFN-EP;10 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0003 (PDF)
    Use pkgcode/variation: T1033-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555AETB-T  
    		TDFN-EP;10 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0003 (PDF)
    Use pkgcode/variation: T1033-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555AEUB  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555AEUB-T  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8555AEUB+  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8555AEUB+T  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Related Products
    MAX8535, MAX8536, MAX8585 ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies

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    Document Ref.: 13-3087; Rev 0; 2004-02-04
    This page last modified: 2007-08-27


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