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ADM1171-2AUJZ-RL7 Scheda tecnica(PDF) 1 Page - Analog Devices |
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ADM1171-2AUJZ-RL7 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 page 2.7 V to 16.5 V Hot Swap Controller with Current Sense Output ADM1171 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Controls supply rails from 2.7 V to 16.5 V Allows protected board removal and insertion to a live backplane External sense resistor provides adjustable analog current limit with circuit breaker Peak fault current limited with fast response Charge pumped gate drive for external N-FET switch Current sense output Soft start inrush current control Automatic retry or latch-off during current fault Undervoltage lockout 8-lead, TSOT package APPLICATIONS Hot swap board insertion: line cards, raid systems Industrial high-side switches/circuit breakers Electronic circuit breakers GENERAL DESCRIPTION The ADM1171 is a hot swap controller that safely enables a printed circuit board to be removed and inserted to a live backplane. This is achieved using an external N-channel power MOSFET with a current control loop that monitors the load current through a sense resistor. An internal charge pump is used to enhance the gate of the N-channel FET. When an overcurrent condition is detected, the gate voltage of the FET is reduced to limit the current flowing through the sense resistor. During an overcurrent condition, the TIMER cap determines the amount of time the FET remains at a current limiting mode of operation until it is shut down. The ON (ON-CLR) pin is the enable input for the device and can be used to monitor the input supply voltage. The ADM1171 operates with a supply voltage ranging from 2.7 V to 16.5 V. The ADM1171 features soft start to provide the user with a capacitor programmable ramping reference to the internal current sense comparator. This provides a linearly increasing current limit at startup at a rate set by CSS. This helps to reduce and limit large inrush currents. The ADM1171 also features a current sense output (CSOUT) pin. The voltage on the CSOUT pin represents the voltage drop across the sense resistor gained up by a factor of 20. This device is available in two options: the ADM1171-1 with automatic retry for overcurrent fault and the ADM1171-2 with latch-off for an overcurrent fault. Toggling the ON (ON-CLR) pin resets a latched fault. The ADM1171 is packaged in an 8-lead TSOT. FUNCTIONAL BLOCK DIAGRAM LONG VIN = 5V VOUT = 5V VCC RSENSE Q1 CTIMER LONG SHORT SENSE GATE ON TIMER SS ADM1171-1 GND GND GND RON1 RON2 CLOAD CSS CSOUT Figure 1. |
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