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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.

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