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

Product Attributes

Introduction

The MAX5933_ and MAX5947_ are fully integrated hotswap controllers for positive supply rails. The devices allow for the safe insertion and removal of circuit cards into live backplanes without causing glitches on the backplane power-supply rail. During startup, the MAX5933_ and MAX5947_ act as current regulators using an external sense resistor and a MOSFET to limit the amount of current drawn by the load. The MAX5933_ operate from a +33V to +80V supply voltage range and have a default undervoltage lockout (UVLO) set to +31V. The MAX5947_ operate from a +9V to +80V supply voltage range and have a default UVLO set to +8.3V. The UVLO threshold is adjustable using a resistive divider connected from VCC to ON to GND. The MAX5933_ and MAX5947_ monitor the input voltage, the output voltage, the output current, and the die temperature. These devices feature power-good outputs (PWRGD/PWRGD) to indicate the status of the output voltage by monitoring the voltage at FB.

Features

• Pin- and function-compatible with the LT1641-2 (MAX5947B)
• Provides safe hot swap for +9V to +80V power-supply range (MAX5947A/B/C)
• Safe board insertion and removal from live backplanes
• Latched/autoretry management
• Active-low or active-high power-good output
• Programmable foldback current limiting
• High-side drive for an external N-channel MOSFET
• Built-in thermal shutdown
• Undervoltage lockout (UVLO)
• Overvoltage protection
• User-programmable supply voltage power-up rate
• Available with a default undervoltage lockout threshold of +31V (MAX5933A–MAX5933F)
• Available with a default undervoltage of +8.3V (MAX5947A/B/C)
• Operate over a supply voltage range of +33V to +80V (MAX5933A–MAX5933F)
• Operate over a supply voltage range of +9V to +80V (MAX5947A/B/C)
• Operate in the extended temperature range of -40°C to +85°C
• Available in an 8-pin SO package

Applications

• Hot Board Insertion
• Electronic Circuit Breakers
• Industrial High-Side Switch/Circuit Breakers
• Network Routers and Switches
• 24V/48V Industrial/Alarm Systems