MAXIM INTEGRATED

Maxim MAX14721-MAX14723 Adjustable Power Limiters

Maxim MAX14721-MAX14723 Adjustable Power Limiters

Maxim Integrated MAX14721, MAX14722, and MAX14723 High-Accuracy Adjustable Power Limiters guard systems against overcurrent faults in addition to positive overvoltage and reverse-voltage faults. When used with an optional external p-channel MOSFET, these devices also protect downstream circuitry from voltage faults up to ±60V. MAX14721-MAX14723 feature a low, 76mΩ, on-resistance integrated FET. During startup, these 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. MAX14721-MAX14723 also 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. MAX14721-MAX14723 also feature reverse-current and overtemperature protection. These devices operate over a -40°C to 125°C temperature range.

Demonstration boards are also available to show off the capabilities of the MAX14721, MAX14722, and MAX14723.


Features

  • Robust, High-Power Protection Reduces System Downtime

    • Wide Input Range: +5.5V to +58V

    • Thermal Foldback Current-Limit Protection

    • Negative Input Tolerance to -60V with External pFET

    • 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 HVEN)

    • Protected External pFET Gate Drive

  • Saves Board Space and Reduces External BOM Count

    • 20-Pin, 5mm x 5mm TQFN Package

    • Integrated nFET

Applications

  • Control and Automation

  • High-Power Applications

  • Human Machine Interfaces

  • Industrial Power Systems

  • Motion System Drives


Typical Application Circuit
Typical Application Circuit

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