LTC4282 High Current Hot Swap 2 Controller with I C Compatible Monitoring Fea T Descrip T n Allows Safe Board Insertion Into Live Backplane The LTC 4282 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 Using one or more external N-channel pass transistors, Monitors Current, Voltage, Power and Energy n board supply voltage and inrush current are ramped up Controls Two Parallel N-Channel MOSFETs for High 2 at an adjustable rate. An I C interface and onboard ADC Current Applications n allows for monitoring of board current, voltage, power, Internal EEPROM for Nonvolatile Configuration n energy and fault status. Wide Operating Voltage Range: 2.9V to 33V 2 n I C/SMBus Digital Interface (Coexists with PMBus The device features analog foldback current limiting and Devices) supply monitoring for applications from 2.9V to 33V. n 12V Gate Drive for Lower MOSFET R DS(ON) Dual 12V gate drive allows high power applications to n Programmable Current Limit with 2% Accuracy either share safe operating area across parallel MOSFETs n MOSFET Power Limiting with Current Foldback or support a 2-stage start-up that first charges the load n Continuously Monitors MOSFET Health capacitance followed by enabling a low on-resistance n Stores Minimum and Maximum Measurements path to the load. n Alerts When Alarm Thresholds Exceeded The LTC4282 is well suited to high power applications n Input Overvoltage/Undervoltage Protection because the precise monitoring capability and accurate n Three General Purpose Input/Outputs current limiting reduce the extremes in which both loads n Internal 5% or External Timebases and power supplies must safely operate. Non-volatile n 32-Pin 5mm 5mm QFN Package configuration allows for flexibility in the autonomous a T generation of alerts and response to faults. n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Enterprise Servers and Data Storage Systems Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of n Network Routers and Switches their respective owners. Patents pending. n Base Stations n Platform Management Typical a T 12V, 100A Plug-In Board Application Start-Up Waveforms 0.25m V OUT 12V 12V CONTACT BOUNCE + V DD 100A 10 0.25m 10V/DIV SMCJ15CA 1 1 1 1 2 V 10 GATE 10V/DIV + + + V SENSE2 ADC SENSE1 SENSE1 ADC SENSE2 GATE1 GATE2 50ms DE-BOUNCE DD NC UV V SOURCE NC OV SOURCE 10V/DIV SDAI FB NC SDA SDAO GPIO1(PG) SCL SCL LTC4282 POWER GPIO1 10V/DIV ALERT ALERT GOOD NC ADR0 4282 TA01b GP GPIO2 ADR1 20ms/DIV ADR2 GPIO3 GP ON 12V INTV TIMER WP CLKIN CLKOUT GND CC 4282 TA01 100k NC 4.7F 10nF GND BACKPLANE PLUG-IN BOARD 4282f 1 For more information www.linear.com/LTC4282 CONNECTOR 2 CONNECTOR 1 ion pplica ions pplica ion uresLTC4282 a Te Maxi Mu M r a T p c F T (Notes 1, 2) TOP VIEW Supply Voltage (V ) ................................. 0.3V to 45V DD Input Voltages GATEn SOURCE (Note 3) .................... 0.3V to 10V 32 31 30 29 28 27 26 25 + + SENSEn , ADC , ON 1 24 GATE2 SENSE1 ............................. V 4.5V to V + 0.3V DD DD OV 2 23 GATE1 SENSE2 , ADC ........................ 0.3V to V + 0.3V GND 3 22 SOURCE DD WP 4 21 FB SOURCE ................................................. 0.3V to 45V 33 INTV 5 20 GND CC ADR0-2, TIMER .....................0.3V to INTV + 0.3V CC TIMER 6 19 GPIO1 CLKIN ................................................... 0.3V to 5.5V CLKOUT 7 18 GPIO2 UV, OV, FB, WP, ON, GPIO1-3, CLKIN 8 17 GPIO3 SCL, SDAI .............................................. 0.3V to 45V 9 10 11 12 13 14 15 16 Output Voltages INTV .................................................. 0.3V to 5.5V CC UH PACKAGE GATE1,2, GPIO1-3, ALERT, SDAO ........... 0.3V to 45V 32-LEAD (5mm 5mm) PLASTIC QFN CLKOUT ...................................0.3 to INTV + 0.3V T = 125C, = 44C/W CC JMAX JA EXPOSED PAD (PIN 33) PCB GND Output Current INTV (V > 4V) ........................25mA CC DD ELECTRICAL CONNECTION OPTIONAL Operating Ambient Temperature Range LTC4282C ................................................ 0C to 70C LTC4282I .............................................40C to 85C Storage Temperature Range .................. 65C to 125C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4282CUH PBF LTC4282CUH TRPBF 4282 32-Lead (5mm 5mm) Plastic QFN 0C to 70C LTC4282IUH PBF LTC4282IUH TRPBF 4282 32-Lead (5mm 5mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: