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High-Accuracy, Adjustable Power Limiters

Industry's First Dynamic Power Limiters with Thermal Controlled Current Foldback

Product Details

The MAX14721–MAX14723 adjustable overvoltage, undervoltage, and overcurrent protection devices guard systems against overcurrent faults in addition to positive overvoltage and reverse-voltage faults. When used with an optional external p-channel MOSFET, the devices also protect downstream circuitry from voltage faults up to +60V, -60V (for -60V external pFET rating). The devices feature a low, 76mΩ, on-resistance integrated FET.

During startup, the devices are designed to charge large capacitances on the output in a continuous mode for applications where large reservoir capacitors are used on the inputs to downstream devices. Additionally, the MAX14721–MAX14723 feature a dual-stage, current-limit mode in which the current is continuously limited to 1x, 1.5x, and 2x the programmed limit, respectively, for a short time after startup. This enables faster charging of large loads during startup.

The MAX14721–MAX14723 also feature reverse-current and overtemperature protection. The devices are available in a 20-pin (5mm x 5mm) TQFN package and operate over a -40°C to 125°C temperature range.

Key Features

  • Robust, High-Power Protection Reduces System Downtime
    • Wide Input Supply Range: +5.5V to +60V
    • Programmable Input Supply Overvoltage Setting Up to 40V
    • Thermal Foldback Current-Limit Protection
    • Negative Input Tolerance to -60V (for -60V External pFET Rating)
    • Low 76mΩ (typ) RON
    • Reverse Current-Blocking Protection with External pFET
  • Enables Safer Startup By Preventing Overheating of FETs
    • Dual-Stage Current Limiting
    • 1.0x Startup Current (MAX14721)
    • 1.5x Startup Current (MAX14722)
    • 2.0x Startup Current (MAX14723)
  • Flexible Design Enables Reuse and Less Requalification
    • Adjustable OVLO and UVLO Thresholds
    • Programmable Forward Current Limit From 0.2A to 2A with ±15% Accuracy Over Full Temperature Range
    • Normal and High-Voltage Enable Inputs (EN and Active-Low HVEN)
    • Protected External pFET Gate Drive
  • Saves Board Space and Reduces External BOM Count
    • 20-Pin, 5mm x 5mm TQFN Package
    • Integrated nFET

Applications/Uses

  • Control and Automation
  • High-Power Applications
  • Human Machine Interfaces
  • Industrial Power Systems
  • Motion System Drives
Parametric specs for Overvoltage/Overcurrent Protectors with Internal MOSFETs
VIN (V) (min) 5.5
VIN (V) (max) 60
Current Limit (A) (min) 0.2
Current Limit (A) (max) 2
# Channels 1
Internal Pwr. MOSFETs NMOS
RON (mΩ) (typ) 76
Current Limit Accuracy (%) 10
Fault Response Latchoff
Reverse Current Protect. Yes
Fault Indicator Yes
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
$2.15 @1k
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Simplified Block Diagram

MAX14721, MAX14722, MAX14723: Typical Application Circuit MAX14721, MAX14722, MAX14723: Typical Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX14721 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the MAX14721 overvoltage, undervoltage, and overcurrent-protection device. The EV kit features an external pMOSFET and LED input/output reading. The EV kit comes with the MAX14721ATP+ installed, but can also be used to evaluate the pin-compatible MAX14722 and MAX14723 devices with IC replacement of U1. Request samples from Maxim when ordering the EV kit.

View Details

Features

  • 5.5V to 58V Operating Voltage Range
  • External pMOSFET Installed
  • Proven PCB Layout
  • Fully Assembled and Tested

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Support & Training

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Parameters

Parametric specs for Overvoltage/Overcurrent Protectors with Internal MOSFETs
VIN (V) (min) 5.5
VIN (V) (max) 60
Current Limit (A) (min) 0.2
Current Limit (A) (max) 2
# Channels 1
Internal Pwr. MOSFETs NMOS
RON (mΩ) (typ) 76
Current Limit Accuracy (%) 10
Fault Response Latchoff
Reverse Current Protect. Yes
Fault Indicator Yes
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
$2.15 @1k

Key Features

  • Robust, High-Power Protection Reduces System Downtime
    • Wide Input Supply Range: +5.5V to +60V
    • Programmable Input Supply Overvoltage Setting Up to 40V
    • Thermal Foldback Current-Limit Protection
    • Negative Input Tolerance to -60V (for -60V External pFET Rating)
    • Low 76mΩ (typ) RON
    • Reverse Current-Blocking Protection with External pFET
  • Enables Safer Startup By Preventing Overheating of FETs
    • Dual-Stage Current Limiting
    • 1.0x Startup Current (MAX14721)
    • 1.5x Startup Current (MAX14722)
    • 2.0x Startup Current (MAX14723)
  • Flexible Design Enables Reuse and Less Requalification
    • Adjustable OVLO and UVLO Thresholds
    • Programmable Forward Current Limit From 0.2A to 2A with ±15% Accuracy Over Full Temperature Range
    • Normal and High-Voltage Enable Inputs (EN and Active-Low HVEN)
    • Protected External pFET Gate Drive
  • Saves Board Space and Reduces External BOM Count
    • 20-Pin, 5mm x 5mm TQFN Package
    • Integrated nFET

Applications/Uses

  • Control and Automation
  • High-Power Applications
  • Human Machine Interfaces
  • Industrial Power Systems
  • Motion System Drives

Description

The MAX14721–MAX14723 adjustable overvoltage, undervoltage, and overcurrent protection devices guard systems against overcurrent faults in addition to positive overvoltage and reverse-voltage faults. When used with an optional external p-channel MOSFET, the devices also protect downstream circuitry from voltage faults up to +60V, -60V (for -60V external pFET rating). The devices feature a low, 76mΩ, on-resistance integrated FET.

During startup, the devices are designed to charge large capacitances on the output in a continuous mode for applications where large reservoir capacitors are used on the inputs to downstream devices. Additionally, the MAX14721–MAX14723 feature a dual-stage, current-limit mode in which the current is continuously limited to 1x, 1.5x, and 2x the programmed limit, respectively, for a short time after startup. This enables faster charging of large loads during startup.

The MAX14721–MAX14723 also feature reverse-current and overtemperature protection. The devices are available in a 20-pin (5mm x 5mm) TQFN package and operate over a -40°C to 125°C temperature range.

Simplified Block Diagram

MAX14721, MAX14722, MAX14723: Typical Application Circuit MAX14721, MAX14722, MAX14723: Typical Application 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.