High-Accuracy, Adjustable Power Limiters

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.

Applications

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

* 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