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ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies

Simplest, smallest OR-ing MOSFET Controllers with Fastest Reverse-Current Protection

Product Details

Key Features

Parametric specs for ORing MOSFET Controllers
Reverse Current Protect. Yes
Under Voltage Protect Yes
Charge Pump Cap. Yes
Soft Start Yes
Enable Yes
Fault Indicator Yes
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.79
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Simplified Block Diagram

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Parameters

Parametric specs for ORing MOSFET Controllers
Reverse Current Protect. Yes
Under Voltage Protect Yes
Charge Pump Cap. Yes
Soft Start Yes
Enable Yes
Fault Indicator Yes
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.79

Key Features

  • Simple, Integrated, and Inexpensive ORing MOSFET Controller
  • ORing MOSFET Drive for 12V (MAX8535/MAX8585) and 3.3V or 5V (MAX8536) Bus
  • Eliminates ORing Diode Power Dissipation and Reverse Leakage Current
  • Provides N + 1 Redundant Supply Capability for Highly Reliable Systems
  • Isolates Failed Supply from Output Bus in <1µs
  • Reverse-Current Flow Detection
  • Programmable Soft-Start
  • Logic-Enable Input
  • Adjustable Overvoltage and Undervoltage Trip Points
  • Fault-Indicator Output
  • Space-Saving 8-Pin µMAX Package

Applications/Uses

  • Network/Telecom Power Supplies
  • On-Board Redundant Power Supplies in Blade Servers
  • Rectifiers
  • Redundant Power Supplies in High-Availability Systems
  • Silver Box Supplies for Servers

Description

Critical loads often employ parallel-connected power supplies with redundancy in order to enhance system reliability. The MAX8535/MAX8536/MAX8585 are highly integrated but inexpensive MOSFET controllers that provide isolation and redundant power capability in high-reliability systems. The MAX8535/MAX8585 are used in 12V systems, and have an internal charge pump to drive the gates of the n-channel pass elements to VCC + 10V. The MAX8536 is used in 3.3V and 5V systems, with a chargepump output of VCC + 5V.

During startup, the MAX8535/MAX8536/MAX8585 monitor the voltage drop across external MOSFETs. Once VCC approaches or exceeds the bus voltage, the MOSFETs are turned on. The MAX8535/MAX8536/MAX8585 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 pin. Once the device is turned on, the MAX8535/MAX8536/MAX8585 monitor the load, protecting against overvoltage, undervoltage, and reverse-current conditions.

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.

All devices come in a space-saving 8-pin µMAX® package and are specified over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX8535, MAX8536, MAX8585: Typical Operating Circuit MAX8535, MAX8536, MAX8585: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.