LTC4215-1/LTC4215-3 Hot Swap Controller with 2 I C Compatible Monitoring FEATURES DESCRIPTION n Allows Safe Insertion into Live Backplane The LTC 4215-1/LTC4215-3 Hot Swap controllers allow n 8-Bit ADC Monitors Current and Voltage a board to be safely inserted and removed from a live 2 n I C/SMBus Interface backplane. Using an external N-channel pass transistor, n Wide Operating Voltage Range: 2.9V to 15V board supply voltage and inrush current are ramped up at 2 n dI/dt Controlled Soft-Start an adjustable rate. An I C interface and onboard ADC allow n Circuit Breaker Timeout: 20s (LTC4215-1) or for monitoring of load current, voltage and fault status. 420s (LTC4215-3) The device features adjustable foldback current limit and n Three General Purpose Outputs a soft-start pin that sets the dI/dt of the inrush current. n High Side Drive for External N-channel MOSFET 2 An I C interface may con gure the part to latch off or n No External Gate Capacitor Required automatically restart after the LTC4215-1/LTC4215-3 n Input Overvoltage/Undervoltage Protection detect a current limit fault. n Optional Latchoff or Auto-Retry After Faults n The controller has additional features to interrupt the host Alerts Host After Faults n when a fault has occurred, provide three general purpose Inrush Current Limit with Foldback n outputs, notify when output power is good, detect insertion Available in 24-Pin (4mm 5mm) QFN of a load card, and power-up either automatically upon 2 APPLICATIONS insertion or wait for an I C command to turn on. n Live Board Insertion The LTC4215-1 has a 20s circuit breaker lter for applica- n Electronic Circuit Breakers tions that require a fast fault response time. The LTC4215-3 n Computers, Servers has an extended 420s circuit breaker lter for applications n Platform Management where supply transients may exceed 20s. L, LT, LTC, LTM, Linear Technology and the Linear logo 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. Protected by U.S. Patent 7330065. TYPICAL APPLICATION 12V Application With 5A Circuit Breaker Start-Up Waveform 0.005 FDC653N V OUT 12V 12V V + DD C 30.1k 10V/DIV L 34.8k 10 INRUSH 3.57k CONTACT 0.1F CURRENT 1.18k BOUNCE 2.5A/DIV + UV V SENSE SENSE GATE SOURCE DD 3.4k OV FB V OUT SDAI GPIO1 POWERGOOD P6KE16A 10V/DIV SDAO SDA LTC4215-1 GPIO2 RESET SCL SCL GPIO3 OK LED ADR0 ADIN ADR1 MEASURED V GPIO1 VOLTAGE INTV CC 10V/DIV ON TIMER SS GND EN 5k PULL-UP TO V DD 68nF 0.1F 42151 TA01b C = 12000F 40ms/DIV GND L 4215 TA01a BACKPLANE PLUG-IN CARD 421513fc 1 CONNECTOR 2 CONNECTOR 1LTC4215-1/LTC4215-3 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage (V ) ................................ 0.3V to 24V DD Supply Voltage (INTV ) .......................... 0.3V to 6.5V CC Input Voltages 24 23 22 21 20 UV 1 19 FB GATE-SOURCE (Note 3) .......................... 0.3V to 5V OV 2 18 GPIO1 + SENSE , SENSE ................ V 0.3V to V + 0.3V DD DD SS 3 17 INTV CC SOURCE .................................................... 5V to 24V 4 25 16 GND TIMER EN, FB, ON, OV, UV ................................ 0.3V to 12V ON 5 15 ADIN ADR0, ADR1, TIMER, EN 6 14 GPIO3 ADIN, SS ................................ 0.3V to INTV + 0.3V SDAO 7 13 ADR1 CC 8 9 10 11 12 GPIO2, GPIO3, SCL, SDA, SDAI, SDAO 0.3V to 6.5V Output Voltages GATE, GPIO1 .......................................... 0.3V to 24V UFD PACKAGE 24-LEAD (4mm 5mm) PLASTIC QFN GPIO2, GPIO3 ....................................... 0.3V to 6.5V T = 125C, = 34C/W (EXPOSED PAD IS SOLDERED) JMAX JA EXPOSED PAD (PIN 25) PCB GND CONNECTION OPTIONAL Operating Temperature Range LTC4215C-1 ............................................. 0C to 70C LTC4215I-1 .......................................... 40C to 85C Storage Temperature Range QFN .................................................... 65C to 125C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4215CUFD-1 PBF LTC4215CUFD-1 TRPBF 42151 0C to 70C 24-Lead (4mm 5mm) Plastic QFN LTC4215IUFD-1 PBF LTC4215IUFD-1 TRPBF 42151 40C to 85C 24-Lead (4mm 5mm) Plastic QFN LTC4215CUFD-3 PBF LTC4215CUFD-3 TRPBF 42153 0C to 70C 24-Lead (4mm 5mm) Plastic QFN LTC4215IUFD-3 PBF LTC4215IUFD-3 TRPBF 42153 40C to 85C 24-Lead (4mm 5mm) Plastic QFN LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4215CUFD-1 LTC4215CUFD-1 TR 42151 24-Lead (4mm 5mm) Plastic QFN 0C to 70C LTC4215IUFD-1 LTC4215IUFD-1 TR 42151 24-Lead (4mm 5mm) Plastic QFN 40C to 85C LTC4215CUFD-3 LTC4215CUFD-3 TR 42153 24-Lead (4mm 5mm) Plastic QFN 0C to 70C LTC4215IUFD-3 LTC4215IUFD-3 TR 42153 24-Lead (4mm 5mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. 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