LTC4280 Datasheet | Linear Technology

.. LTC4280 Hot Swap Controller with 2 I C patible Monitoring Features n n n n n n n n n n n n DESCRIPTION The LTC®4280 Hot Swap™ controller allows a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, board supply voltage and inrush current are ramped up at an adjustable rate. An I2C interface and onboard ADC allow for monitoring of load current, voltage and fault status. The device Features adjustable analog foldback current limit and a FILTER pin which configures the time spent in overcurrent before declaring a fault. An I2C interface may configure the part to latch off or automatically restart after the LTC4280 detects a current limit fault. The controller has additional Features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card, and power-up either automatically upon insertion or wait for an I2C mand to turn on. Allows Safe Insertion into Live Backplane 8-Bit ADC Monitors Current and Voltage I2C/SMBus Interface Wide Operating Voltage Range: 2.9V to 15V Adjustable Overcurrent Filter Time High Side Drive for External N-Channel MOSFET No External Gate Capacitor Required Input Overvoltage/Undervoltage Protection Optional Latchoff or Auto-Retry After Faults Alerts Host After Faults Inrush Current Limit with Foldback Available in 24-Pin 4mm × 5mm QFN Package APPLICATIONS n n n n Live Board Insertion Electronic Circuit Breakers puters, Servers Platform Management L, LT, LTC, LTM, Linear Technology, the Linear logo and Hot Swap are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 12V Application with 5A Circuit Breaker 0.005Ω 12V 34.8k 10Ω 1.18k P6KE16A 3.4k UV VDD OV SDAO SDAI SCL ALERT INTVCC 0.1μF GND BACKPLANE PLUG-IN CARD SENSE+ SENSE- GATE SOURCE FB EN LTC4280 ADIN GPIO ON TIMER FILTER GND 4280 TA02 Start-Up...