حفاظت مدار محدودکننده‌های ولتاژ گذرا (تی وی اس) تجهیزات حفاظت در برابر اضافه‌ولتاژ گذرا (اس پی دی)

Product Attributes

Introduction

The MAX1807/MAX1808 provide overvoltage protection for systems with multiple supply rails. Very low output voltage supplies can have an overvoltage before the power - supply controller has sufficient supply voltage to activate protection circuitry. The MAX1807/MAX1808 offer a system - wide approach to effectively protect the loads and prevent catastrophic events. The MAX1807/MAX1808 are powered directly by the main system input supply. A low output voltage from DP activates a P - channel switch to supply power to the rest of the system. As the rest of the system supplies come up, the MAX1807/MAX1808 monitor each of them for overvoltage conditions and safely disconnect the input from the rest of the system if any supply malfunctions occur due to a shorted MOSFET, shorted copper trace, or malfunctioning supply. Built - in overvoltage detectors in individual power supplies provide redundancy. The MAX1807/MAX1808 drive the main P - channel load switch that powers the system. The driver includes active clamping to safely drive a 12V P - channel MOSFET gate. If overvoltage is detected, the P - channel load switch is turned off and the state is latched. The internal fault latch resets when VDD is less than 2.7V (power cycled) or ON is pulled low (manual reset). When ON is logic low, the P - channel switch is turned off.

Features

• Five 3% Accurate Overvoltage Comparators
• Series PFET Gate Driver with VGS Limiter
• 21µA Quiescent Supply Current
• 4µA Shutdown Current
• 4.4V to 28V Operating Voltage Range
• 3% Accurate Comparator with 10% Hysteresis for Low - Battery Detection (MAX1808)
• 28V Open - Drain N - Channel Output (MAX1807)
• Small 10 - Pin µMAX Package

Applications

• Notebook Computers
• Power - Supply Modules
• Multi - Output Power Supplies