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Analog Devices / Maxim Integrated MAX14692/MAX14693 Adjustable Power Limiters

Analog Devices Inc. MAX14692-MAX14693 High-Accuracy Adjustable Power Limiters are adjustable overvoltage, undervoltage, and overcurrent protection devices that 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.

ADI MAX14692-MAX14693 power limiters feature a low, 31mΩ, 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. These devices offer a dual-stage, current-limit mode in which the current is continuously limited to 1.5x or 2x the programmed limit, respectively, for a short time after startup. This feature enables faster charging of large loads during startup.

Features

  • Robust, high-power protection reduces system downtime
    • +5.5V to +58V wide input range 
    • Negative input tolerance to -60V with external pFET
    • Low 31mΩ (typ) RON
    • Reverse current-blocking protection with external pFET
  • Enables fast startup and brownout recovery
    • Thermal foldback current-limit protection
    • Dual-stage current limiting
    • 1.5x startup current (MAX14692)
    • 2.0x startup current (MAX14693)
  • Flexible design enables reuse and less requalification
    • Adjustable OVLO and UVLO thresholds
    • Programmable forward current limit from 0.6A to 6A 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

  • Industrial power systems
  • Control and automation
  • Motion system drives
  • Human machine interfaces
  • High-power applications

Development Tool

Analog Devices / Maxim Integrated MAX14691EVKIT Evaluation Kit

Fully assembled and tested circuit board that demonstrates the MAX14691 protection device.

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Published: 2015-01-15 | Updated: 2023-04-17