LTC4222 Dual Hot Swap Controller 2 with I C Compatible Monitoring FEATURES DESCRIPTION n Allows Safe Insertion Into a Live Backplane The LTC 4222 Hot Swap controller allows two power n 10-Bit ADC Monitors Currents and Voltages paths to be safely inserted and removed from a live back- 2 n I C/SMBus Interface plane. Using external N-channel pass transistors, board n Wide Operating Voltage Range: 2.9V to 29V supply voltages and inrush currents are ramped up at an 2 n dI/dt Controlled Soft-Start adjustable rate. An I C interface and onboard ADC allows n High Side Drive for External N-Channel MOSFETs for monitoring of current, voltage and fault status for n No External Gate Capacitors Required each channel. n Input Overvoltage/Undervoltage Protection The device features adjustable, analog, foldback current n Optional Latchoff or Auto-Retry After Faults limit circuits and a soft-start circuit that sets the dI/dt of n Alert Host After Faults 2 the inrush currents. An I C interface may configure the n Inrush Current Limit with Foldback part to latch off or automatically restart after the LTC4222 n Available in 32-Pin (5mm 5mm) QFN detects a fault on either channel. and 36-Pin SSOP Packages The controller has additional features to interrupt the host APPLICATIONS when a fault has occurred, notify when output power is good, detect insertion of a load card and power-up either n Live Board Insertion 2 automatically upon insertion or wait for an I C command n Electronic Circuit Breakers to turn on. n Computers, Servers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot n Platform Management Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7330065. TYPICAL APPLICATION Advanced Mezzanine Card Application 6m Si7336ADP 12V 12V 7.4A 34k 10.2k 10 0.1F Start-Up Waveform with Sequencing 10k 1.02k 3.57k UV1 V SENSE1 GATE1 SOURCE1 DD1 3.4k OV1 FB1 V IN1/2 ON GPIO1 12PGOOD ON 10V/DIV SDA EN1 SDA SCL SCL ADIN1 CONTACT ALERT ALERT BOUNCE TIMER V OUT2 CONFIG 1F 10V/DIV ADR0 LTC4222 NC ADR1 SS V OUT1 ADR2 68nF 10V/DIV ADIN2 INTV CC 0.1F EN2 GPIO GND PGOOD GPIO2 AUXPGOOD 10V/DIV 3.4k OV2 FB2 UV2 V SENSE2 GATE2 SOURCE2 DD2 4222 TA01b 1.02k 50ms/DIV 3.57k 10 10nF 10k 0.1F 6.55k 4.99k 3.3V 3.3V 150mA Si1046R 300m BACKPLANE PLUG-IN 4222 TA01a CARD 4222fb 1LTC4222 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages (V ) .............................. 0.3V to 35V ADINn, CONFIG ...................................... 0.3V to 12V DDn Supply Voltage (INTV ) ........................... 0.3V to 6.5V ALERT, SCL, SDA, SDAI, SDAO ............ 0.3V to 6.5V CC Input Voltages Output Voltages GATEn SOURCEn (Note 3) .................... 0.3V to 5V GATEn, GPIOn ........................................ 0.3V to 35V + SENSE n ..........................V 6.5V to V + 0.3V Operating Temperature Range DDn DDn + SENSE n .............................0.3V to SENSE n + 0.3V LTC4222C ................................................ 0C to 70C SOURCEn .................................................. 5V to 35V LTC4222I..............................................40C to 85C + UVn .....................................0.3V to SENSE n + 0.3V Storage Temperature Range ...................65C to 150C ENn, FBn, ON, OVn ................................ 0.3V to 12V Lead Temperature (Soldering, 10 sec) ADR0-2, TIMER, SS ...............0.3V to INTV + 0.3V SSOP ................................................................ 300C CC PIN CONFIGURATION TOP VIEW SENSE1 1 36 GATE1 TOP VIEW + SENSE1 2 25 SOURCE1 3 34 FB1 V DD1 UV1 4 33 GPIO1 32 31 30 29 28 27 26 25 OV1 5 32 EN1 SS 1 24 EN1 6 31 ADIN1 SS CONFIG 2 23 ADIN1 CONFIG 7 30 ON1 INTV 3 22 ON CC INTV 8 29 ON2 CC GND 4 21 ALERT 9 28 ALERT 33 GND ADR0 5 20 SCL ADR0 10 27 SCL ADR1 SDA 6 19 11 26 SDAI ADR1 ADR2 7 18 ADIN2 12 SDAO ADR2 25 TIMER 8 17 EN2 TIMER 13 24 ADIN2 9 10 11 12 13 14 15 16 14 23 EN2 OV2 15 GPIO2 UV2 22 V 16 21 FB2 DD2 + UH PACKAGE 17 20 SOURCE2 SENSE2 32-LEAD (5mm 5mm) PLASTIC QFN 18 GATE2 SENSE2 19 T = 125C, = 34C/W JMAX JA EXPOSED PAD (PIN 33), PCB GND CONNECTION OPTIONAL G PACKAGE 36-LEAD PLASTIC SSOP T = 125C, = 95C/W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4222CG PBF LTC4222CG TRPBF LTC4222CG 36-Lead Plastic SSOP 0C to 70C LTC4222IG PBF LTC4222IG TRPBF LTC4222IG 36-Lead Plastic SSOP 40C to 85C LTC4222CUH PBF LTC4222CUH TRPBF LTC4222 32-Lead (5mm 5mm) Plastic QFN 0C to 70C LTC4222IUH PBF LTC4222IUH TRPBF LTC4222 32-Lead (5mm 5mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: