LTC1644 CompactPCI Bus Hot Swap Controller FEATURES DESCRIPTIO TM n Allows Safe Board Insertion and Removal from a The LTC 1644 is a Hot Swap controller that allows a board TM Live, CompactPCI Bus to be safely inserted and removed from a CompactPCI bus n Controls 12V, 3.3V, 5V and 12V Supplies slot. External N-channel transistors control the 3.3V/5V n Adjustable Foldback Current Limit with Circuit supplies, while on-chip switches control the Breaker 12V and 12V supplies. The 3.3V and 5V supplies can be n Dual-Level Circuit Breakers Protect 5V and 3.3V ramped up at a programmable rate. Electronic circuit break- Supplies from Overcurrent and Short-Circuit Faults ers protect all four supplies against overcurrent faults. The n LOCAL PCI RST Logic On-Chip PWRGD output indicates when all of the supply voltages are n PRECHARGE Output Biases I/O Pins During Card within tolerance. The OFF/ON pin is used to cycle the board Insertion and Extraction power or reset the circuit breaker. The PRECHARGE output n Adjustable Supply Voltage Power-Up Rate can be used to bias the bus I/O pins during card insertion U and extraction. PCI RST is combined on-chip with APPLICATIO S HEALTHY in order to generate LOCAL PCI RST . , LTC and LT are registered trademarks of Linear Technology Corporation. n Hot Board Insertion into CompactPCI Bus Hot Swap is a trademark of Linear Technology Corporation. CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group. TYPICAL APPLICATIO C8 C9 0.1F 0.1F PCB EDGE PER 10 PER 10 BACKPLANE BACKPLANE R2 Q2 POWER POWER CONNECTOR CONNECTOR 0.007 PINS 5V * IRF7413 PINS IN 5V OUT 5V + 5V AT 5.7A C R22 2.74 R1 LOAD(5VOUT) Q1 LONG 5V 0.005 3V * IRF7413 IN 3V OUT 3.3V 3.3V AT 8A + R21 1.74 C LOAD(3VOUT) Z3 Z4 LONG 3.3V C1 R3 R4 R5 0.047F 10 10 1k C6 C7 0.01F 0.01F 17 16 15 18 13 14 3 3V 3V GATE 3V 5V 5V 5V IN SENSE OUT IN SENSE OUT 20 12V OUT 12V OUT Z1 Z2 + 12V AT 500mA C LOAD(12VOUT) 1 12V 12V IN 19 V EEOUT 2 V EEOUT 12V AT 100mA 12V V EEIN C LOAD(VEEOUT) R19 5V IN LTC1644 1k R20 1.2k 5 20-PIN SSOP OFF/ON BD SEL 4 EARLY V(I/O) 6 TIMER C2 FAULT 0.1F R17 R18 2k 2k 7 R6 HEALTHY PWRGD 2k 9 10 PCI RST RESETIN RESETOUT 3V OUT GND PRECHARGE DRIVE R15 R16 8 12 11 1 1 R8 1k R9 C4 C5 R10 C3 4.7nF 24 0.01F 0.01F 18 5% GROUND 3V IN Q3 R7 R11 R12 RESET 1V MMBT2222A 12 51k 51k R13 10 10% I/O DATA LINE 1 I/O 1 I/O PIN 1 PCI R14 10 BRIDGE I/O DATA LINE 128 I/O 128 I/O PIN 128 CHIP 1644 F01 Z1, Z2: SMAJ12CA Z3, Z4: 1PMT5.0AT3 *5V AND 3V MAY BE USED AS SOURCES OF EARLY POWER IN IN Figure 1 1644f 1 + U ULTC1644 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Supply Voltages ORDER PART 12V ................................................................ 13.2V 1 20 12V NUMBER IN 12V IN OUT V .................................................................. 14V 2 19 V V EEIN EEIN EEOUT LTC1644CGN 3 18 3V Input Voltages (Pins 5, 9) .......................0.3V to 13.5V 5V OUT OUT LTC1644IGN 4 17 3V TIMER Output Voltages (Pins 6, 7, 10) ..............0.3V to 13.5V IN 5 16 3V OFF/ON SENSE Analog Voltages and Currents 6 15 GATE FAULT Pins 3, 11 to 14, 16 to 18 ...................0.3V to 13.5V 7 14 5V PWRGD SENSE Pins 4, 15 ............................. 0.3V to (12V + 0.3V) IN 8 13 5V GND IN V ...................................................14V to 0.3V EEOUT 9 12 PRECHARGE RESETIN 12V ...............................................0.3V to 13.2V OUT 10 11 DRIVE RESETOUT Operating Temperature Range GN PACKAGE LTC1644C ............................................... 0 C to 70 C 20-LEAD PLASTIC SSOP LTC1644I............................................ 40 C to 85 C T = 140 C, q = 135 C/W JMAX JA Storage Temperature Range ................. 65 C to 150 C Consult LTC Marketing for parts specified with wider operating temperature ranges. Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. A V = 12V, V = 12V, V = 3.3V, V = 5V unless otherwise noted. 12VIN EEIN 3VIN 5VIN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I V Supply Current OFF/ON = 0V l 38 mA DD 12VIN V Undervoltage Lockout 12V , Ramping Down l 6.00 8.30 10.80 V LKO IN 3V , 5V , Ramping Down l 2.25 2.48 2.75 V IN IN V Foldback Current Limit Voltage V = (V V ), V = 0V, TIMER = 0V l 812 15 mV FB FB 5VIN 5VSENSE 5VOUT V = (V V ), V = 3V, TIMER = 0V l 40 51 70 mV FB 5VIN 5VSENSE 5VOUT V = (V V ), V = 0V, TIMER = 0V l 812 15 mV FB 3VIN 3VSENSE 3VOUT V = (V V ), V = 2V, TIMER = 0V l 40 51 70 mV FB 3VIN 3VSENSE 3VOUT V Circuit Breaker Trip Voltage V = (V V ), TIMER = FLOAT l 40 55 70 mV CB CB 5VIN 5VSENSE V = (V V ), TIMER = FLOAT l 40 55 70 mV CB 3VIN 3VSENSE t Overcurrent Fault Response Time (V V ) = 100mV, TIMER = FLOAT l 30 45 60 m s OC 5VIN 5VSENSE (V V ) = 100mV, TIMER = FLOAT l 30 45 60 m s 3VIN 3VSENSE t Short-Circuit Response Time (V V ) = 200mV, TIMER = FLOAT l 0.1 1.0 m s SC 5VIN 5VSENSE (V V ) = 200mV, TIMER = FLOAT l 0.1 1.0 m s 3VIN 3VSENSE I GATE Pin Output Current OFF/ON = 0V, V = 0V, TIMER = 0V l 20 65 100 m A CP GATE V = 5V, OFF/ON = 4V 100 225 300 m A GATE OFF/ON = 0V, V = 2V, TIMER = FLOAT, FAULT = 0V l 310 20 mA GATE D V External Gate Voltage D V = (V V ), I = 1m A l 50 200 mV GATE GATE 12VIN GATE GATE V Internal Switch Voltage Drop V = (V V ), I = 500mA l 200 600 mV DROP DROP 12VIN 12VOUT V = (V V ), I = 100mA l 110 250 mV DROP EEOUT EEIN EE I Current Foldback 12V = 12V, 12V = 0V, TIMER = 0V l 50 360 600 mA CL IN OUT = 12V, 12V = 10V, TIMER = 0V l 525 840 1500 mA 12V IN OUT V = 12V, V = 0V, TIMER = 0V l 20 100 300 mA EEIN EEOUT V = 12V, V = 10V, TIMER = 0V l 200 320 650 mA EEIN EEOUT T Thermal Shutdown Temperature 130 C TS 1644f 2 U WWW