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ADM1177-1ARMZ-R7 Datenblatt(PDF) 1 Page - Analog Devices |
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ADM1177-1ARMZ-R7 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 16 page Hot Swap Controller and Digital Power Monitor with Soft-Start Pin Preliminary Technical Data ADM1177 Rev. PrD May 2006 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 Allows Safe Board Insertion and Removal from a Live Backplane Controls Supply Voltages from 3.15 V to 14V Precision Current Sense Amplifier Precision Voltage Input 12-Bit ADC for Current and Voltage Readback Charge Pumped Gate Drive for External N-FET Switch Adjustable Analog Current Limit with Circuit Breaker Fast Response Limits Peak Fault Current Automatic Retry or Latch-Off On Current Fault Programmable hot swap timing via TIMER pin Soft-start pin for reference adjustment and programming of initial current ramp rate Active-high ON pin I2C Fast Mode compliant interface (400 KHz max) 10-lead MSOP package APPLICATIONS Power Monitoring/Power Budgeting Central office Equipment Telecommunication and Datacommunication Equipment PC/Servers GENERAL DESCRIPTION The ADM1177 is an integrated hot-swap controller which offers digital current and voltage monitoring via an on-chip 12-bit ADC, communicated through an I2C interface. An internal current sense amplifier senses voltage across the sense resistor in the power path via the VCC and SENSE pins. The ADM1177 limits the current through this resistor by controlling the gate voltage of an external N-channel FET in the power path, via the GATE pin. The sense voltage (and hence the inrush current) is kept below a preset maximum. The ADM1177 protects the external FET by limiting the time that it spends with the maximum current running in it. This current limit period is set by the choice of capacitor attached to the TIMER pin. Additionally, the device provides protection from overcurrent events at times after the hot-swap event is complete. In the case of a short-circuit event the current in the sense resistor will exceed an overcurrent trip threshold, and the FET will be switched off immediately by pulling down the GATE pin. FUNCTIONAL BLOCK DIAGRAM + - SCL I2C 12-Bit ADC ADM1177 V SENSE VCC SDA GND I ADR SS FET Drive Controller GATE ON 0 1 + - UV Comparator Current Sense Amplifier Mux 1.3V A TIMER Figure 1. APPLICATIONS DIAGRAM R SENSE CONTROLLER ADM1177 SENSE VCC SDA SCL SDA SCL 3.15V - 14V P=VI GND GATE N-Channel FET ON ADR TIMER SS Figure 2. A Soft-start (SS) pin is also included. This gives the user control over the reference on the current sense amplifier. An internal current source will charge a capacitor on this pin at startup, allowing the user set the profile of the initial current ramp. A voltage can also be driven on this pin to alter the reference. A 12-bit ADC can measure the current seen in the sense resistor, and also the supply voltage on the VCC pin. An industry standard I2C interface allows a controller to read current and voltage data from the ADC. Measurements can be initiated by an I2C command. Alternatively the ADC can run continuously and the user can read the latest conversion data whenever it is required. Up to 4 unique I2C addresses can be created by the way the ADR pin is connected. The ADM1177 is packaged in a 10-lead MSOP package. |
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Ähnliche Beschreibung - ADM1177-1ARMZ-R7 |
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