Hot Swap Controller in 6-Lead TSOT Package Data Sheet ADM4210 FEATURES FUNCTIONAL BLOCK DIAGRAM Controls supply rails from 2.7 V to 16.5 V R SENSE V = 5V V = 5V IN Q OUT LONG 0.01 1 Allows protected board removal and insertion to a live + C LOAD backplane 470F V CC SENSE External sense resistor provides adjustable analog current limit with circuit breaker R G Peak fault current limited with fast response 100 GATE GATE DRIVE/ Charge pumped gate drive for external N-FET switch LOGIC R 1.3V C Automatic retry or latch-off during current fault R ON1 100 20k ON SHORT C Undervoltage lockout C 0.01F R ON2 C TIMER Low profile (1 mm), 6-lead, TSOT package 10k TIMER Pin compatible with LTC4210-1 and LTC4210-2 ADM4210 GND C TIMER 0.22F GND LONG GND APPLICATIONS Hot swap board insertion: line cards, raid systems Figure 1. Industrial high-side switches/circuit breakers Electronic circuit breakers C = 470F LOAD V ON GENERAL DESCRIPTION (2V/DIV) The ADM4210 is a hot swap controller that safely enables a printed circuit board to be removed and inserted to a live V TIMER backplane. This is achieved using an external N-channel power (1V/DIV) MOSFET with a current control loop that monitors the load current through a sense resistor. An internal charge pump is V OUT (5V/DIV) used to enhance the gate of the N-channel FET. When an overcurrent condition is detected, the gate voltage of the FET is I OUT reduced to limit the current flowing through the sense resistor. (0.5A/DIV) During an overcurrent condition, the TIMER cap determines 10ms/DIV the amount of time the FET remains at a current limiting mode Figure 2. Start-Up Sequence CLR of operation until it is shut down. The ON (ON- ) pin is the enable input for the device and can be used to monitor the input supply voltage. The ADM4210 operates with a supply voltage ranging from 2.7 V to 16.5 V. The ADM4210 is available in two options: the ADM4210-1 with automatic retry for overcurrent fault and the ADM4210-2 with CLR latch off for an overcurrent fault. Toggling the ON (ON- ) pin resets a latched fault. The ADM4210 is packaged in a 6-lead TSOT. Rev. A 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 20062013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 05132-050 05132-001ADM4210 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 UVLO ........................................................................................... 11 Applications ....................................................................................... 1 ON (ON-CLR) Pin ..................................................................... 11 General Description ......................................................................... 1 GATE ........................................................................................... 11 Functional Block Diagram .............................................................. 1 Current Limit Function ............................................................. 11 Revision History ............................................................................... 2 Calculating the Current Limit .................................................. 11 Specifications ..................................................................................... 3 Circuit Breaker Function ........................................................... 12 Absolute Maximum Ratings ............................................................ 4 Timer Function ........................................................................... 12 Thermal Characteristics .............................................................. 4 Power-Up Timing Cycle ............................................................ 12 ESD Caution .................................................................................. 4 Circuit Breaker Timing Cycle ................................................... 13 Pin Configurations and Function Descriptions ........................... 5 Automatic Retry or Latched Off ............................................... 13 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 14 Theory of Operation ...................................................................... 11 Ordering Guide .......................................................................... 14 Overview ...................................................................................... 11 REVISION HISTORY 11/13Rev. 0 to Rev. A Changes to Figure 33 ...................................................................... 13 7/06Revision 0: Initial Version Rev. A Page 2 of 16