Full-Feature 48 V Hot Swap Controller Data Sheet ADM1073 FEATURES FUNCTIONAL BLOCK DIAGRAM Precision inrush linear current limit V SPLYGD IN Soft start inrush current limit profiling PWRGD Precision maximum on-time in current limit V AND CC FOLDBACK REFERENCE Maximum on-time modulated by FET drain voltage for AND PWRGD DRAIN GENERATOR additional SOA protection OVERVOLTAGE OV Adjustable PWM retry scheme and multiple device cascading DETECTOR V IN capability for charging large capacitive loads UNDERVOLTAGE UV DETECTOR Limited number of PWM cycles for FET SOA protection under 50 A 100mV(MAX) short circuit condition GATE SOFT START SS CONTROL Ability to configure device as continuous autoretry with a SENSE 5-second cooling period TIMER t CONTROL ON FAULT TIMER Shunt regulator topology to allow very large transient input AND CONTROL supplies V EE Separate UV and OV pins for programming allowable input 5 SECOND PWM OSCILLATOR SHUTDOWN TIMEOUT supply window Programmable OV hysteresis using current source into pin SHDN RESTART LATCHED when supply is high Programmable UV hysteresis using current sink from pin Figure 1. when supply is low PWRGD output indicates when capacitor charging complete APPLICATIONS SPLYGD output indicates when supply is within Central office switching valid window Telecommunication and data communication equipment LATCHED output indicates the end of the retry cycle before 48 V distributed power systems load capacitance is charged Negative power supply control SHDN input for user-commanded shutdown High availability servers RESTART input for user-triggered 5-second shutdown and 48 V power supply modules autorestart virtual card reseat Disk arrays GENERAL DESCRIPTION The ADM1073 is a full-feature, negative voltage, hot swap A built-in soft start function allows control of the inrush controller that allows boards to be safely inserted and removed current profile by an external capacitor on the soft start (SS) from a live 48 V backplane. The part provides precise and pin. robust current limiting, and protection against both transient An external capacitor on the TIMER pin determines the time and nontransient short circuits in overvoltage and undervoltage for which the FET gate is controlled to be high when maximum conditions. The ADM1073 can operate from a negative voltage inrush current flows. The ADM1073 employs a limited consec- of 18 V to 80 V and can tolerate transient voltages of up to utive retry scheme, whereby, if the load capacitance is not fully 200 V. charged within one attempt, the FET gate is pulled low and Inrush current is limited to a programmable value by control- retries after a cooling period. ling the gate drive of an external N-channel FET. The maximum (continued on Page 3) current limit is set by the choice of the sense resistor, R . SENSE Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20042013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 04488-001ADM1073 Data Sheet TABLE OF CONTENTS General Description ......................................................................... 3 Timing ControlTIMER ......................................................... 15 Specifications ..................................................................................... 4 Drain ............................................................................................ 16 Absolute Maximum Ratings ............................................................ 6 PWRGD ....................................................................................... 16 Thermal Characteristics .............................................................. 6 LATCHED ................................................................................... 16 ESD Caution .................................................................................. 6 SPLYGD ....................................................................................... 16 Pin Configuration and Function Descriptions ............................. 7 RESTART ..................................................................................... 16 Typical Performance Characteristics ............................................. 8 SHDN ........................................................................................... 16 Functional Description .................................................................. 13 Undervoltage/Overvoltage Detection ..................................... 16 Hot Circuit Insertion ................................................................. 13 Functionality and Timing.............................................................. 18 Initial Startup .............................................................................. 13 Live Insertion .............................................................................. 18 Board Removal ........................................................................... 14 Overvoltage and Undervoltage Faults ..................................... 18 Controlling the Current ............................................................. 14 Soft Start ...................................................................................... 19 Sense ............................................................................................. 15 Current Faults ............................................................................. 20 Sense Resistor .............................................................................. 15 Logic Inputs................................................................................. 21 Soft Start (SS Pin) ....................................................................... 15 Kelvin Sense Resistor Connection ........................................... 21 GATE ............................................................................................ 15 Outline Dimensions ....................................................................... 22 VIN ................................................................................................. 15 Ordering Guide .......................................................................... 22 VEE ................................................................................................. 15 REVISION HISTORY 7/13Rev. A to Rev. B Changes to Figure 15 ...................................................................... 10 Changes to Figure 32 ...................................................................... 13 Changes to V Equation .............................................................. 17 OV 2/12Rev. 0 to Rev. A Updated Outline Dimensions ....................................................... 22 Changes to Ordering Guide .......................................................... 22 4/04Revision 0: Initial Version Rev. B Page 2 of 24