Analog Devices / Maxim Integrated MAX14721-MAX14723 High-Accuracy Power Limiters
Analog Devices 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 features a low, 76mΩ, on-resistance integrated FET. During startup, these devices are designed to charge large capacitances on the output continuously for applications where large reservoir capacitors are used on the inputs to downstream devices.
MAX14721-MAX14723 also features 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 feature enables faster charging of large loads during startup. ADI MAX14721-MAX14723 also features reverse-current and overtemperature protection. These devices operate over a -40°C to 125°C temperature range and are ideal for a variety of applications, such as industrial power systems, control and automation, motion system drives, and more.
Features
- Robust, high-power protection reduces system downtime
- +5.5V to +58V wide input range
- 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
Applications
- Control and automation
- High-power applications
- Human-machine interfaces
- Industrial power systems
- Motion system drives
Typical Application Circuit
MAX14721EVKIT Evaluation Kit
ADI MAX14721EVKIT Evaluation Kit is a fully assembled and tested circuit board that demonstrates the MAX14721 overvoltage, undervoltage, and overcurrent-protection device. The evaluation kit features an external p-channel MOSFET and LED input/output reading. It comes with the MAX14721ATP+ installed, but can also be used to evaluate the pin-compatible MAX14722 and MAX14723 devices with IC replacement of U1. The kit has an operating voltage range of 5.5V to 58V. Typical applications or uses include control & automation, motion system drives, high-power, industrial power systems, and human-machine interfaces.
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