DC2278A-B Analog Devices

LTC4281 2 Hot Swap Controller with I C Compatible Monitoring FEATURES DESCRIPTION n Allows Safe Board Insertion Into Live Backplane The LTC 4281 hot swap controller allows a board to n 12-/16-Bit ADC with 0.7% Total Unadjusted Error be safely inserted and removed from a live backplane. n Monitors Current, Voltage, Power and Energy Using an external N-channel pass transistor, board supply n Internal EEPROM for Nonvolatile Configuration voltage and inrush current are ramped up at an adjust- 2 n Wide Operating Voltage Range: 2.9V to 33V able rate. An I C interface and onboard ADC allows for 2 n I C/SMBus Digital Interface (Coexists with PMBus monitoring of board current, voltage, power, energy and Devices) faultstatus. n 12V Gate Drive for Lower MOSFET R DS(ON) The device features analog foldback current limiting to n Programmable Current Limit with 2% Accuracy limit the MOSFET power to a constant value. A wide input n MOSFET Power Limiting with Current Foldback voltage operating range comfortably allows applications n Continuously Monitors MOSFET Health from 2.9V to 33V. n Stores Minimum and Maximum Measurements n The LTC4281 is well suited to high power applications Alerts When Alarm Thresholds Exceeded 2 n because the precise monitoring capability and accurate Reboots on I C Command n current limiting reduce the extremes in which both loads Input Overvoltage and Undervoltage Protection n and power supplies must safely operate. Non-volatile con- Three General Purpose Input/Outputs n figuration allows for flexibility in the autonomous genera- Internal 5% or External Timebases n tion of alerts and response to faults. 28-Pin 4mm 5mm QFN Package n AEC-Q100 Qualified for Automotive Applications All registered trademarks and trademarks are the property of their respective owners. APPLICATIONS n Enterprise Servers and Data Storage Systems n Network Routers and Switches n Base Stations n Platform Management TYPICAL APPLICATION 12V, 65A Plug-In Board Resident Application Start-Up Waveforms 0.5m V OUT 12V 12V + 65A CONTACT BOUNCE V DD 10 10V/DIV SMCJ15CA + + V ADC SENSE SENSE ADC GATE SOURCE DD V GATE NC UV FB NC 10V/DIV NC OV 50ms DE-BOUNCE SDAI POWER GPIO1 SDA SDAO GOOD V SOURCE LTC4281 SCL SCL 10V/DIV ALERT ALERT GPIO2 GP NC ADR0 GPIO1(PG) ADR1 GPIO3 GP 10V/DIV ADR2 4281 TA01b ON 12V INTV TIMER WP CLKIN CLKOUT GND 20ms/DIV CC 4281 TA01a 100k NC 4.7F 10nF GND BACKPLANE PLUG-IN BOARD Rev. B 1 Document Feedback For more information www.analog.com CONNECTOR 2 CONNECTOR 1LTC4281 TABLE OF CONTENTS Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Order Information ................................................................................................................. 3 Pin Configuration ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .......................................................................................... 7 Pin Functions ...................................................................................................................... 9 Functional Diagram .............................................................................................................11 Operation..........................................................................................................................12 Applications Information .......................................................................................................13 Register Set ......................................................................................................................31 2 Detailed I C Command Register Descriptions ..............................................................................32 Typical Applications .............................................................................................................43 Package Description ............................................................................................................44 Revision History .................................................................................................................45 Typical Application ..............................................................................................................46 Related Parts .....................................................................................................................46 Rev. B 2 For more information www.analog.com