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LTC4215CUFD Datasheet(PDF) 1 Page - Linear Technology |
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LTC4215CUFD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC4215/LTC4215-2 1 4215fe TYPICAL APPLICATION DESCRIPTION Hot Swap Controller with I2C Compatible Monitoring The LTC ®4215/LTC4215-2 Hot Swap™ controllers allow 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 foldback current limit and a soft-start pin that sets the dI/dt of the inrush current. An I2C interface may configure the part to latch off or automatically restart after the LTC4215 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. The LTC4215 has a 20μs circuit breaker filter for applica- tions that require a fast fault response time and it defaults to latchoff after an overcurrent fault. The LTC4215-2 has an extended 420μs circuit breaker filter for applications where supply transients may exceed 20μs and it defaults to restart automatically after an overcurrent fault. 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 20μs (LTC4215) or 420μs (LTC4215-2) Circuit Breaker Timeout n dI/dt Controlled Soft-Start 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 n LTC4215 also available in 16-Lead Narrow SSOP Package + UV VDD SENSE + SENSE– LTC4215UFD GATE TIMER SS 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 4215 TA01a CL INTVCC INTVCC 0.1μF 0.1μF 34.8k BACKPLANE 68nF GND ALERT SCL SDA 12V VOUT 10V/DIV VGPIO (POWERGOOD) 10V/DIV INRUSH CURRENT 2.5A/DIV VDD 10V/DIV 50ms/DIV 42151 TA01b 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. Protected by U.S. Patent including 7330065. |
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