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ADM1270CP-EVALZ Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM1270CP-EVALZ Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 21 page High Voltage Input Protection Device Data Sheet ADM1270 Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2014–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 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 safe operating area (SOA) Power-good and fault outputs Analog undervoltage (UV) and overvoltage (OV) protection 16-lead, 3 mm × 3 mm LFCSP 16-lead QSOP APPLICATIONS Industrial modules Battery-powered/portable instrumentation GENERAL DESCRIPTION The ADM1270 is a current-limiting controller that provides inrush current limiting and overcurrent protection for modular or battery-powered systems. When circuit boards are inserted into a live backplane, discharged supply bypass capacitors draw large transient currents from the backplane power bus as they charge. 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. The ADM1270 is designed to control the inrush current, when powering on the system, via an external P-channel field effect transistor (FET). To protect the 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 ADM1270 is available in a 3 mm × 3 mm, 16-lead LFCSP and a 16-lead QSOP. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM 1V 1V GATE DRIVE/ LOGIC VCB TIMER ON TIMEOUT IOUT CURRENT LIMIT TIMER VCC/SENSE+ SENSE– GATE TIMER GND UV OV RPFG FLB LDO VCAP REF SELECT ISET FAULT FB_PG ENABLE TIMER_OFF PWRGD + + + – – + – – CURRENT- LIMIT CONTROL ADM1270 Figure 1. |
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