LTC4211IS8 Analog Devices

LTC4211 Hot Swap Controller with Multifunction Current Control FEATURES DESCRIPTION n Allows Safe Board Insertion and Removal The LTC 4211 is a hot swap controller that allows a board from a Live Backplane to be safely inserted and removed from a live backplane. n Controls Supply Voltages from 2.5V to 16.5V An internal high side switch driver controls the gate of an n Programmable Soft-Start with Inrush Current external N-channel MOSFET for supply voltages ranging Limiting, No External Gate Capacitor Required from 2.5V to 16.5V. The LTC4211 provides soft-start and n Faster Turn-Off Time Because No External Gate inrush current limiting during the start-up period which Capacitor is Required has a programmable duration. n Dual Level Overcurrent Fault Protection Two on-chip current limit comparators provide dual level n Programmable Response Time for Overcurrent overcurrent circuit breaker protection. The slow com- Protection (MS) parator trips at V 50mV and activates in 20s (or is CC n Programmable Overvoltage Protection (MS) programmed by an external filter capacitor, MS only). n Automatic Retry or Latched Mode Operation (MS) The fast comparator trips at V 150mV and typically CC n High Side Drive for an External N-Channel FET responds in 300ns. n User-Programmable Supply Voltage Power-Up Rate n The FB pin monitors the output supply voltage and signals FB Pin Monitors V and Signals RESET OUT n the RESET output pin. The ON pin signal turns the chip on Glitch Filter Protects Against Spurious RESET Signal and off and can also be used for the reset function. The MS package has FAULT and FILTER pins to provide addi- APPLICATIONS tional functions like fault indication, autoretry or latch-off modes, programmable current limit response time and n Electronic Circuit Breaker programmable overvoltage protection using an external n Hot Board Insertion and Removal (Either On Zener diode clamp. Backplane or On Removable Card) L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Industrial High Side Switch/Circuit Breaker Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Single Channel 5V Hot Swap Controller Power-Up Sequence BACKPLANE PCB EDGE NO C LOAD CONNECTOR CONNECTOR (FEMALE) (MALE) R M1 SENSE 0.007 Si4410DY V V OUT GATE LONG V CC 5V 5V/DIV 5V + 5A R X C LOAD 10 Z1* V C RESET X 5V/DIV 100nF 8 7 6 R3 R5 36k 10k V SENSE GATE CC 5 FB R1 V ON R4 20k 1V/DIV SHORT 2 P ON LTC4211 15k LOGIC V R2 TIMER 1 RESET RESET 1V/DIV 10k TIMER GND 2.5ms/DIV 4211 TA01b 3 4 PCB CONNECTION SENSE C TIMER 10nF LONG GND GND 4211 TA01A Z1 = 1SMA10A OR SMAJ10A * OPTIONAL 4211fc 1 For more information www.linear.com/LTC4211LTC4211 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (V ) ................................................17V Operating Temperature Range CC Input Voltage LTC4211C ................................................ 0C to 70C FB, ON .................................................. 0.3V to 17V LTC4211I ............................................. 40C to 85C SENSE, FILTER ........................... 0.3V to V + 0.3V Storage Temperature Range ..................65C to 150C CC TIMER ...................................................... 0.3V to 2V Lead Temperature (Soldering, 10 sec) ...................300C Output Voltage GATE ................................. Internally Limited (Note 3) RESET, FAULT ....................................... 0.3V to 17V PIN CONFIGURATION TOP VIEW TOP VIEW TOP VIEW RESET 1 8 V RESET 1 10 FAULT CC RESET 1 8 V CC ON 2 9 V CC ON 2 7 SENSE ON 2 7 SENSE FILTER 3 8 SENSE TIMER 3 6 GATE TIMER 4 7 GATE TIMER 3 6 GATE 5 FB GND 4 GND 5 6 FB GND 4 5 FB MS8 PACKAGE MS PACKAGE 8-LEAD PLASTIC MSOP 10-LEAD PLASTIC MSOP S8 PACKAGE T = 125C, = 200C/W JMAX JA T = 125C, = 200C/W JMAX JA 8-LEAD PLASTIC SO T = 125C, = 150C/W JMAX JA ORDER INFORMATION