High-voltage inrush/overcurrent input protection device
The ADM1270 is designed to control the inrush current, when powering-on a system, via an external P-channel field effect transistor (FET); it manages the currents that charge bypass capacitors when circuit boards are inserted into a live backplane. These transient currents can cause permanent damage to connector pins, as well as dips on the backplane supply that can reset other boards in the system.
To protect a system from a reverse polarity input supply, there is a provision made to control an additional external P-channel FET. This feature prevents reverse current flow in case of a reverse polarity connection, which can damage the load or the ADM1270. The device comes in a 3 × 3 mm, 16-lead LFCSP and a 16-lead QSOP; use it in industrial modules, and in battery powered/portable instrumentation.
Features include;
- Controls supply voltages from 4 V to 60 V;
- Gate drive for low voltage drop reverse supply protection;
- Gate drive for P-channel FETs;
- Inrush current limiting control;
- Adjustable current limit;
- Foldback current limiting;
- Automatic retry or latch-off on current fault;
- Programmable current-limit timer for SOA;
- Power-good and Fault outputs;
- Analogue undervoltage (UV) and overvoltage (OV) protection.
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