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LTC4280CUFD-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC4280CUFD-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC4280 1 4280f TYPICAL APPLICATION DESCRIPTION Hot Swap Controller with I2C Compatible Monitoring 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 command to turn on. FEATURES APPLICATIONS n Live Board Insertion n Electronic Circuit Breakers n Computers, Servers n Platform Management n Allows Safe Insertion into Live Backplane n 8-Bit ADC Monitors Current and Voltage n I2C/SMBus Interface n Wide Operating Voltage Range: 2.9V to 15V n Adjustable Overcurrent Filter Time n High Side Drive for External N-Channel MOSFET n No External Gate Capacitor Required n Input Overvoltage/Undervoltage Protection n Optional Latchoff or Auto-Retry After Faults n Alerts Host After Faults n Inrush Current Limit with Foldback n Available in 24-Pin 4mm × 5mm QFN Package + UV VDD SENSE + SENSE– LTC4280 GATE TIMER FILTER ON GND SOURCE OV SDAO SDAI SCL ALERT INTVCC FB EN ADIN GPIO 3.4k PLUG-IN CARD 1.18k P6KE16A 10Ω 0.005Ω FDC653N 30.1k VOUT 12V 3.57k 24k 4280 TA01 CL INTVCC INTVCC 0.1μF 0.1μF 34.8k BACKPLANE 47nF GND ALERT SCL SDA 12V VOUT 10V/DIV VGPIO (POWERGOOD) 10V/DIV INRUSH CURRENT 2.5A/DIV VDD 10V/DIV 50ms/DIV 4280 TA02 CL = 12000μF CONTACT BOUNCE 12V Application with 5A Circuit Breaker Start-Up Waveform 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. |
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