Circuit Protection Misc Adjustable Overcurrent and Overvoltage Protector

The MAX14571/MAX14572/MAX14573 adjustable overvoltage-and overcurrent-protection devices are ideal to protect systems against positive and negative input voltage faults up to ±40V and feature low 100mO (typ) RON FETs. The overvoltage-protector (OVP) feature protects voltages between 6V and 36V, while the undervoltage-protector (UVP) feature protects voltages between 4.5V and 24V. The overvoltage-lockout (OVLO) and undervoltage-lockout (UVLO) thresholds are set using optional external resistors. The factory-preset internal OVLO threshold is 33V (typ) and the preset internal UVLO threshold is 19.2V (typ). The ICs also feature programmable current-limit protection up to 4.2A. Once current reaches the threshold, the MAX14571 turns off after the 20.7ms (typ) blanking time and stays off during the retry period. The MAX14572 latches off after the blanking time, and the MAX14573 limits the current continuously. In addition, these devices feature reverse current and thermal-shutdown protection. The ICs are available in a small 14-pin TSSOP (5mm x 6.5mm) package and are specified over the extended -40°C to +85°C temperature range.

• Integrated Protection Increases System Reliability
  • Adjustable OVLO and UVLO Thresholds (±3% Accurate Preset Thresholds)
  • Automatic Internal and External Selection
  • Programmable Forward Current Limit (Adjustable Up to 4.2A) with ±15% Accuracy
  • Thermal-Shutdown Protection
  • 100mO (typ) On-Resistance FET

Special Features Facilitate Designs for Industrial Applications

• Wide 4.5V to 36V Operating Input Range
• Reverse-Current Flow Option for Inductive Loads
• Independent Microprocessor Enable Input (EN) and High-Voltage-Capable Input (HVEN)