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MAX14721：High-Accuracy, Adjustable Power Limiters

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

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. The MAX14721–MAX14723 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 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 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

MAX14721, MAX14722, MAX14723: Typical Application Circuit Applications/Uses Control and Automation High-Power Applications Human Machine Interfaces Industrial Power Systems Motion System Drives

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Design kits & evaluation modules

• MAX14721EVKIT

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