LTC4230 Triple Hot Swap Controller with Multifunction Current Control DESCRIPTIO FEATURES TM n Allows Safe Board Insertion and Removal The LTC 4230 is a 3-channel Hot Swap controller that from a Live Backplane allows a board to be safely inserted and removed from a n Controls Three Supply Voltages from 1.7V to 16.5V live backplane. Internal high side switch drivers control with V V V the gates of external N-channel MOSFETs for supply CC1 CC2 CC3 n Programmable Soft-Start with Inrush Current voltages ranging from 1.7V to 16.5V. The LTC4230 pro- Limiting, No External Gate Capacitor Required vides soft-start and inrush current limiting during the n Faster Turn-Off Time with No Gate Capacitor programmable start-up period. n Dual Level Overcurrent Fault Protection On-chip current limit comparators provide dual level n Programmable Overcurrent Response Time circuit breaker protection. The slow comparators trip at n Programmable Overvoltage Protection V 50mV and activate in 10m s or are programmed by CCn n Automatic Retry or Latched Mode Operation an external filter capacitor. The fast comparators trip at n Independent N-Channel FET High Side Drivers V 150mV and typically respond in 500ns. CCn n User-Programmable Supply Voltage Power-Up Rate n Each FBn pin monitors its own output supply voltage and FBn Pin Monitors V and Signals RESETn OUTn n signals its RESET pin. The ON pin turns the chip on and Glitch Filter Eliminates Spurious RESETn Signals U off and can be used for a reset function. The LTC4230 also APPLICATIO S provides additional functions including fault indication, autoretry or latchoff modes, programmable current limit n Electronic Circuit Breaker response time based on the FAULT and FILTER pins n Hot Board Insertion and Removal (Either On functionality. Backplane or On Removable Card) , LTC and LT are registered trademarks of Linear Technology Corporation. n Industrial High Side Switch/Circuit Breaker Hot Swap is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO 3-Channel Hot Swap Controller BACKPLANE PCB EDGE CONNECTOR CONNECTOR R Q1 SENSE1 (FEMALE) (MALE) 0.007 IRF7413 V OUT1 LONG 3.3V V CC1 RX1 5A 3.3V R Q2 SENSE2 10 V 0.007 IRF7413 OUT2 LONG V CC2 2.5V 2.5V CX1 5A Z1*** LONG V R Q3 CC3 100nF SENSE3 V 1.8V 0.007 IRF7413 OUT3 1.8V 5A RX3 RX2 Z2*** 10 10 67 8 16 17 18 5 4 3 R8 CX3 V SENSE 1 GATE 1 V SENSE 2 GATE 2 V SENSE 3 GATE 3 CC1 CC2 CC3 5.1k 100nF 1 R7 Z3*** FB3 10k CX2 R9 100nF 12k PCB CONNECTION SENSE 2 RESET 3 RESET 3 SHORT R10 R1 11k R2 20 10k 10k FB2 LTC4230 15 R11 R6 R5 ON 12k 10k 10k 13 SHORT FAULT FAULT 19 RESET 2 RESET 2 14 LONG GND GND 9 RESET 1 RESET 1 12 TIMER R12 11 18k 10 FILTER FB1 R13 C * C ** TIMER FILTER * SYSTEM ON TIME: 6.2ms 12k 0.1F 15pF **CIRCUIT BREAKER RESPONSE TIME: 19.5s 4230 TA01 ***OPTIONAL Z1, Z2, Z3: SMAJ10 4230f 1 U ULTC4230 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Supply Voltage (V ) ............................................. 17V CCn NUMBER FB3 1 20 FB2 SENSEn Pins ............................... 0.3V to (V + 0.3V) CC RESET 3 2 19 RESET 2 LTC4230CGN FBn, ON Pins ............................... 0.3V to (V + 0.3V) CC GATE 3 3 18 GATE 2 LTC4230IGN TIMER Pin ...................................................0.3V to 2V SENSE 3 4 17 SENSE 2 GATEn Pins........................... Internally Limited (Note 3) V 5 16 V CC3 CC2 RESETn, FAULT, FILTER Pins ....................0.3V to 17V V 6 15 ON CC1 Operating Temperature Range SENSE 1 7 14 GND GATE 1 8 13 FAULT LTC4230C ............................................... 0 C to 70 C RESET 1 9 12 TIMER LTC4230I............................................ 40 C to 85 C FB1 10 11 FILTER Storage Temperature Range ................. 65 C to 150 C Lead Temperature (Soldering, 10 sec).................. 300 C GN PACKAGE 20-LEAD PLASTIC SSOP T = 125 C, q = 95 C/ W JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.3V, V = 2.5V,V = 1.8V unless otherwise noted. (Note 2) A CC1 CC2 CC3 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Voltage (V ) l 2.700 16.5 V CC CC1 Supply Voltage (V)V V l 2.375 16.5 V CC2 CC2 CC1 Supply Voltage (V)V (V 1V) l 1.700 15.5 V CC3 CC3 CC1 I Supply Current (I ) ON = V , FB1 = High l 1.8 3 mA CC CC1 CC1 Supply Current (I ) ON = V , FB2 = High l 75 150 m A CC2 CC1 Supply Current (I ) ON = V , FB3 = High l 65 150 m A CC3 CC1 V Undervoltage Lockout , Channel 1 V Low to High Transition l 2.15 2.35 2.52 V LKO1 CC1 V Undervoltage Lockout , Channel 2 V Low to High Transition l 1.98 2.15 2.32 V LKO2 CC2 V Undervoltage Lockout , Channel 3 V Low to High Transition l 1.09 1.19 1.29 V LKO3 CC3 V Undervoltage Lockout Hysteresis, Channel 1 100 mV LKOHST1 V Undervoltage Lockout Hysteresis, Channel 2 45 mV LKOHST2 V Undervoltage Lockout Hysteresis, Channel 3 35 mV LKOHST3 I FBn Pin Input Current 0V V V l 0.1 10 m A IN, FBn FBn CCn I ON Pin Input Current 0V V V l 0.1 10 m A IN, ON ON CC1 I Input Current for SENSEn 0V V V l 0.1 15 m A IN, SENSEn SENSEn CCn V Circuit Breakern Trip Voltage Fast Comparator l 135 150 165 mV CB(FAST) V Slow Comparator l 40 50 60 mV CB(SLOW) I GATEn Pull-Up Current Charge Pump On, 0 V < 0.2V l 12.5 10 6.5 m A GATEn, UP GATEn I Normal GATEn Pull-Down Current ON Low, V = 5V 200 m A GATEn, DN GATEn Fast GATEn Pull-Down Curent FAULT Latched and Circuit Breaker 16 mA Tripped or in UVLO, V = 5V GATEn I RESETn Leakage Current V = 15V, Pull-Down Device Off l 0.1 2.5 m A LEAK RESETn 4230f 2 U WWW