LTC4224-1/LTC4224-2 Compact Dual Low Voltage Hot Swap Controller FEATURES DESCRIPTION n Allows Safe Board Insertion and Removal from a The LTC 4224 Dual Low Voltage Hot Swap controller Live Backplane allows a board to be safely inserted and removed from a n Controls Load Voltages from 1V to 6V live backplane. It controls two supplies with external N- n No Gate Components Required channel MOSFETs and operates with one supply as low n Adjustable Current Limit with Circuit Breaker as 1V provided the other supply is 2.7V or greater. The n Limits Peak Fault Current in 1s LTC4224 can ramp up the supplies in any order and at n No External Timing Capacitor Required adjustable ramp rates. To minimize the number of external n Adjustable Supply Voltage Power-Up Rate components and PCB area, the gate capacitor is optional, n Gate Drive for External N-channel MOSFET all timing delays are generated internally, and the ON pins n LTC4224-1: Latchoff After Fault have integrated pull-up currents. n LTC4224-2: Automatic Retry After Fault Protection against overcurrent faults is provided by a fast- n 10-Lead MSOP and 3mm 2mm DFN Packages acting current limit and timed circuit breakers. A FAULT pin signals overcurrent faults. The LTC4224-1 remains off after APPLICATIONS a fault, while the LTC4224-2 automatically tries to apply n Optical Networking power again after a four second cool-down period. n Low Voltage Hot Swap L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap n is a trademark of Linear Technology Corporation. All other trademarks are the property of their Electronic Circuit Breakers respective owners. TYPICAL APPLICATION Normal Power-Up Waveform FDS6911 0.015 5V 5V 1A 0.010 3.3V 3.3V V OUT1 2A 5V/DIV V OUT2 V SENSE1 V SENSE2 GATE1 GATE2 5V/DIV CC1 CC2 I IN1 ON1 LTC4224 2A/DIV LTC4224 ON2 FAULT GND GND I IN2 2A/DIV C = 150F LOAD CONNECTOR PLUG-IN 422412 TA01b 0.5ms/DIV CARD 422412 TA01a 422412fa 1LTC4224-1/LTC4224-2 (Notes 1, 2) ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) .................................. 0.3V to 9V Operating Temperature Range CCn Input Voltages LTC4224C ................................................ 0C to 70C SENSEn, ONn ........................................... 0.3V to 9V LTC4224I.............................................. 40C to 85C Output Voltages Storage Temperature Range .................. 65C to 150C GATEn V (Note 4) .............................. 0.3V to 5V Lead Temperature Range (Soldering, 10 sec) CC FAULT ....................................................... 0.3V to 9V MSOP Package .................................................300C PIN CONFIGURATION TOP VIEW TOP VIEW SENSE1 1 10 SENSE2 SENSE1 1 10 SENSE2 V 2 9 V CC1 CC2 V 2 9 V CC1 CC2 11 GATE1 3 8 GATE2 GATE1 3 8 GATE2 FAULT 4 7 GND FAULT 4 7 GND ON1 5 6 ON2 ON1 5 6 ON2 MS PACKAGE 10-LEAD PLASTIC MSOP DDB PACKAGE T = 125C, = 160C/W 10-LEAD (3mm 2mm) PLASTIC DFN JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4224CDDB-1 PBF LTC4224CDDB-1 TRPBF LDTT 10-Lead (3mm 2mm) Plastic DFN 0C to 70C LTC4224CDDB-2 PBF LTC4224CDDB-2 TRPBF LDNV 10-Lead (3mm 2mm) Plastic DFN 0C to 70C LTC4224IDDB-1 PBF LTC4224IDDB-1 TRPBF LDTT 40C to 85C 10-Lead (3mm 2mm) Plastic DFN LTC4224IDDB-2 PBF LTC4224IDDB-2 TRPBF LDNV 40C to 85C 10-Lead (3mm 2mm) Plastic DFN LTC4224CMS-1 PBF LTC4224CMS-1 TRPBF LTDTV 10-Lead Plastic MSOP 0C to 70C LTC4224CMS-2 PBF LTC4224CMS-2 TRPBF LTDNW 10-Lead Plastic MSOP 0C to 70C LTC4224IMS-1 PBF LTC4224IMS-1 TRPBF LTDTV 10-Lead Plastic MSOP 40C to 85C LTC4224IMS-2 PBF LTC4224IMS-2 TRPBF LTDNW 10-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: