LTC1647-2 Datasheet | Linear Technology

LTC1647-1/LTC1647-2/LTC1647-3 Dual Hot Swap Controllers Features s s s s s s s DESCRIPTIO Allows Safe Board Insertion and Removal from a Live Backplane Programmable Electronic Circuit Breaker FAULT Output Indication Programmable Supply Voltage Power-Up Rate High Side Drive for External MOSFET Switches Controls Supply Voltages from 2.7V to 16.5V Undervoltage Lockout The LTC®1647-1/LTC1647-2/LTC1647-3 are dual Hot Swap TM controllers that permit a board to be safely inserted and removed from a live backplane. Using external N-channel MOSFETs, the board supply voltages can be ramped up at a programmable rate. A high side switch driver controls the MOSFET gates for supply voltages ranging from 2.7V to 16.5V. A programmable electronic circuit breaker protects against overloads and shorts. The ON pins are used to control board power or clear a fault. The LTC1647-1 is a dual Hot Swap controller with a mon VCC pin, separate ON pins and is available in an SO-8 package. The LTC1647-2 is similar to the LTC1647-1 but bines a fault status flag with automatic retry at the ON pins and is also available in the SO-8 package. The LTC1647-3 has individual VCC pins, ON pins and FAULT status pins for each channel and is available in a 16-lead narrow SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. U APPLICATIO S s s s s Hot Board Insertion Electronic Circuit Breaker Portable puter Device Bays Hot Plug Disk Drive TYPICAL APPLICATIO 3.3V VID SUPPLY R1 0.1Ω Q1 1/2 MMDF3N02HD VID Controller for Two Device Bays DEVICE #1 CONNECTOR #1 R3- - R2 10Ω + CLOAD- R4- - 1394 PHY AND/OR USB PORT 8 1 ON1 ON2 2 3 4 SENSE 1 VCC ON1 ON2 GND SENSE 2 7 6 GATE 1 C1 4.7n F 2.5V/DIV LTC1647-1 - GATE 2 5 R6 10Ω CLOAD IS USER-SELECTED BASED ON THE DEVICE REQUIREMENTS - - R3, R4, R7 AND R8 ARE OPTIONAL DISCHARGE RESISTORS WHEN DEVICES ARE POWERED-OFF Q1, Q2: ON SEMICONDUCTOR C3 4.7n F DEVICE...