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ADM1171-2AUJZ-RL7 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte ADM1171-2AUJZ-RL7
Spiegazioni elettronici  2.7 V to 16.5 V Hot Swap Controller with Current Sense Output
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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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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