LTC4224-1 Datasheet | Linear Technology

.. LTC4224-1/LTC4224-2 pact Dual Low Voltage Hot Swap Controller DESCRIPTION The LTC®4224 Dual Low Voltage Hot Swap™ controller allows a board to be safely inserted and removed from a live backplane. It controls two supplies with external Nchannel MOSFETs and operates with one supply as low as 1V provided the other supply is 2.7V or greater. The LTC4224 can ramp up the supplies in any order and at adjustable ramp rates. To minimize the number of external ponents and PCB area, the gate capacitor is optional, all timing delays are generated internally, and the ON pins have integrated pull-up currents. Protection against overcurrent faults is provided by a fastacting current limit and timed circuit breakers. A FAULT pin signals overcurrent faults. The LTC4224-1 remains off after a fault, while the LTC4224-2 automatically tries to apply power again after a four second cool-down period. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Features n n n n n n n n n n n Allows Safe Board Insertion and Removal from a Live Backplane Controls Load Voltages from 1V to 6V No Gate ponents Required Adjustable Current Limit with Circuit Breaker Limits Peak Fault Current in ≤1μs No External Timing Capacitor Required Adjustable Supply Voltage Power-Up Rate Gate Drive for External N-channel MOSFET LTC4224-1: Latchoff After Fault LTC4224-2: Automatic Retry After Fault 10-Lead MSOP and 3mm × 2mm DFN Packages APPLICATIONS n n n Optical Networking Low Voltage Hot Swap Electronic Circuit Breakers TYPICAL APPLICATION 0.015Ω 5V 0.010Ω 3.3V FDS6911 5V 1A 3.3V 2A VOUT1 5V/DIV VOUT2 5V/DIV Normal Power-Up Waveform VCC1 SENSE1 VCC2 SENSE2 GATE1 GATE2 LTC4224 LTC4224 FAULT ON1 ON2 GND GND IIN1 2A/DIV IIN2 2A/DIV CLOAD = 150μF 0.5ms/DIV 422412 TA01b CONNECTOR PLUG-IN CARD 422412 TA01a 422412fa .Data...