Analog Devices / Maxim Integrated MAX14721-MAX14723 高精度可调节功率限制器
美信集成 MAX14721、MAX14722、MAX14723 高精度可调节功率限制器可在出现过流、正向过压和反向电压故障时对系统提供保护。当与一种可选的外部 p-通道 MOSFET 配套使用时，该器件还保护下游电路免遭高达 ±60V 的电压故障的影响。MAX14721-MAX14723 采用了 76mΩ 低导通电阻集成式 FET。在启动期间，这款器件可对输出端的大电容进行连续模式充电，可用于使用大储能电容对下游器件供电的设计。MAX14721-MAX14723 还具有两级限流模式，在启动后短时间内分别将电流连续限制在预设限值的 1 倍、1.5 倍和 2 倍，这样启动期间可以更快速地为大负载器件充电。MAX14721-MAX14723 还具有反向电流和过温保护功能。这些器件在 -40°C 到 125°C 的温度范围内工作，适合于多种应用，如工业电力系统、控制和自动化、运动系统驱动等。
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.
特性
- 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
应用
- 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.