LTC4221IGN#PBF Analog Devices

LTC4221 Dual Hot Swap Controller/ Power Sequencer with Dual Speed, Dual Level Fault Protection FEATURES DESCRIPTIO TM Allows Safe Board Insertion and Removal from a The LTC 4221 is a 2-channel Hot Swap controller that Live Backplane allows a board to be safely inserted and removed from a Configurable Power Supply Sequencing live backplane. Using two independent high side gate Soft-Start with Current Foldback Limits Inrush drivers to control two external N-channel pass transistors, Current the output voltages can be ramped up with current foldback No External Gate Capacitor Required to limit the inrush current during the start-up period. No Adjustable Dual Level Circuit Breaker Protection external compensation capacitors are required at the Controls Supply Voltages from 1V to 13.5V GATE pins. The two channels can be configured to ramp up Independent N-Channel MOSFET High Side Drivers and down separately or simultaneously for supply volt- FB Pin Monitors V for Overvoltage Protection ages ranging from 2.7V to 13.5V and 1V to 13.5V for OUT Latch Off or Automatic Retry on Current Fault channels 1 and 2 respectively. FAULT and PWRGD Outputs Each channel has two current limit comparators that Narrow 16-Pin SSOP Package provide dual level and dual speed overcurrent circuit U breaker protection after the start-up period. If any current APPLICATIO S sense voltage exceeds 100mV for 1s or 25mV for the Electronic Circuit Breaker timeout delay (set by the C at the FILTER pin), then FILTER Power Supply Sequencing the FAULT latch is set and both GATE pins are pulled low. Live Board Insertion and Removal The FB pins monitor the respective channel output volt- Industrial High Side Switch/Circuit Breaker ages and provide the inputs for the PWRGD comparators , LTC and LT are registered trademarks of Linear Technology Corporation. as well as overvoltage protection. Hot Swap is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO 2-Channel Hot Swap Controller BACKPLANE PCB EDGE CONNECTOR CONNECTOR (FEMALE) (MALE) 0.004 IRF7413 LONG V V CC1 OUT1 3.3V/5A 3.3V 10 0.004 IRF7413 LONG V V CC2 OUT2 2.5V/5A 2.5V 100nF 10 * * 100nF 14.3k V SENSE1 GATE1 V SENSE2 GATE2 CC1 CC2 21k SHORT ON1 FB2 10k 5.11k 10k 10k 13.3k SHORT PWRGD2 PWRGD2 ON2 LTC4221 10k FAULT PWRGD1 PWRGD1 20k SHORT GND FAULT TIMER FILTER FB1 LONG GND 5.11k 1nF *SMAJ10 (OPTIONAL) 470nF 4221 TA01 4221fa 1 U ULTC4221 ABSOLUTE MAXIMUM RATINGS PI CO FIGURATIO (Note 1) Supply Voltage (V ) ............................................ 17V CCn TOP VIEW SENSEn Pins ............................ 0.3V to (V + 0.3V) CCn ON1 1 16 ON2 FB, ON Pins .............................. 0.3V to (V + 0.3V) CC1 V 2 15 V CC1 CC2 TIMER Pin .................................................. 0.3V to 2V SENSE1 3 14 SENSE2 GATE Pins (Note 3)................................... 0.3V to 21V GATE1 4 13 GATE2 PWRGD, FAULT, FILTER Pins................... 0.3V to 17V FB1 5 12 FB2 Operating Temperature Range PWRGD1 6 11 PWRGD2 FAULT 7 10 GND LTC4221C ............................................... 0C to 70C FILTER 8 9 TIMER LTC4221I............................................ 40C to 85C Storage Temperature Range ................. 65C to 150C GN PACKAGE 16-LEAD PLASTIC SSOP Lead Temperature (Soldering, 10 sec).................. 300C T = 125C, = 130C/W JMAX JA UUW ORDER I FOR ATIO LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4221CGN PBF LTC4221CGN TRPBF 4221 16-Lead Plastic SSOP 0C to 70C LTC4221IGN PBF LTC4221IGN TRPBF 4221I 16-Lead Plastic SSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4221CGN LTC4221CGN TR 4221 16-Lead Plastic SSOP 0C to 70C LTC4221IGN LTC4221IGN TR 4221I 16-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: