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ADM1070

Analog Devices
Part Number ADM1070
Manufacturer Analog Devices
Description -48 V Hot Swap Controller
Published Mar 24, 2010
Detailed Description a FEATURES Allows Safe Board Insertion and Removal from a Live –48 V Backplane Typically Operates from –36 V to –80 V To...
Datasheet PDF File ADM1070 PDF File

ADM1070
ADM1070

Overview
a FEATURES Allows Safe Board Insertion and Removal from a Live –48 V Backplane Typically Operates from –36 V to –80 V Tolerates Transients up to –200 V (Limited by External Components) Accurate Programmable Linear Current Limit for In-Rush Control and Short Circuit Protection Programmable Timeout in Current Limit Limited Consecutive Retry: Auto-Restart after Current Limit Timeout Shutdown after Seven Consecutive Auto Restarts Provides Immunity from Step Induced Current Spikes Default Timing Provided with no TIMER Capacitor Single Pin Undervoltage/Overvoltage Detection Programmable Operating Voltage Window Programmable Undervoltage/Overvoltage Time Filter Small 6-Lead SOT-23 Package APPLICATIONS Central Office Switching –48 V Distributed Power Systems Negative Power Supply Control Hot Board Insertion Electronic Circuit Breaker High Availability Servers Programmable Current Limiting Circuit –48 V Power Supply Modules –48 V Hot Swap Controller ADM1070 FUNCTIONAL BLOCK DIAGRAM 0V VDD RDROP 16k⍀ VIN CLOAD VOUT R1 VCC AND VCC REFERENCE 12V GENERATOR VREF UV/OV R2 TIMER ( )* –48V VEE OVER-UNDER VOLTAGE DETECTION CIRCUIT 100mV EN VIN 45␮A FAULT TIMER AND CONTROL Q1 GATE OSCILLATOR ADM1070 SENSE RSENSE VEE *OPTIONAL TIMER CAPACITOR GENERAL DESCRIPTION The ADM1070 is a negative voltage hot swap controller that allows a board to be safely inserted and removed from a live –48 V backplane.
The part achieves this by providing robust current limiting, protection against transient and nontransient short circuits and overvoltage and undervoltage conditions.
The ADM1070 typically operates from a negative voltage of up to –80 V and can tolerate transient voltages of up to –200 V.
In-rush current is limited to a programmable value by controlling the gate drive of an external N-channel FET.
The current limit can be controlled by the choice of the sense resistor, RSENSE.
Added control of the in-rush current is provided by an on-chip timer that uses pulsewidth modul...


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