High-Accuracy, Adjustable Power Limiters

 

Part Number	Replacement	Explanation

Description

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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.

MAX14721, MAX14722, MAX14723: Typical Application Circuit Enlarge+

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) R_ON
  • 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