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LTC1644IGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1644IGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTC1644 1 1644f The LTC ®1644 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a CompactPCI bus slot. External N-channel transistors control the 3.3V/5V supplies, while on-chip switches control the –12V and 12V supplies. The 3.3V and 5V supplies can be ramped up at a programmable rate. Electronic circuit break- ers protect all four supplies against overcurrent faults. The PWRGD output indicates when all of the supply voltages are within tolerance. The OFF/ON pin is used to cycle the board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extraction. PCI_RST# is combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#. s Hot Board Insertion into CompactPCI Bus , LTC and LT are registered trademarks of Linear Technology Corporation. s Allows Safe Board Insertion and Removal from a Live, CompactPCI TM Bus s Controls –12V, 3.3V, 5V and 12V Supplies s Adjustable Foldback Current Limit with Circuit Breaker s Dual-Level Circuit Breakers Protect 5V and 3.3V Supplies from Overcurrent and Short-Circuit Faults s LOCAL_PCI_RST# Logic On-Chip s PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction s Adjustable Supply Voltage Power-Up Rate CompactPCI Bus Hot Swap Controller Hot Swap is a trademark of Linear Technology Corporation. CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group. Figure 1 DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO Z2 C5 0.01 µF C1 0.047 µF C4 0.01 µF GND 12VIN VEEIN OFF/ON FAULT PWRGD RESETIN 3VIN 3VIN* 5VIN* 3VSENSE 17 3VOUT 18 5VIN LTC1644 20-PIN SSOP 13 PRECHARGE 12 DRIVE 11 5VOUT 3 5VSENSE 14 16 GATE 15 1 2 5 6 7 9 12VOUT VEEOUT TIMER RESETOUT 20 19 4 10 R18 2k R19 1k R20 1.2k EARLY V(I/O) R3 10 Ω 5VIN Z1 C6 0.01 µF C7 0.01 µF Z1, Z2: SMAJ12CA Z3, Z4: 1PMT5.0AT3 *5VIN AND 3VIN MAY BE USED AS SOURCES OF EARLY POWER R4 10 Ω R17 2k 5VOUT 5V AT 5.7A 3VOUT 3.3V AT 8A 12VOUT 12V AT 500mA VEEOUT –12V AT 100mA I/O DATA LINE 1 I/O DATA LINE 128 I/O #1 1644 F01 Q3 MMBT2222A 1V ±10% 8 R11 51k R10 18 Ω 5% 3VIN 3VOUT R13 10 Ω I/O #128 R14 10 Ω R12 51k R6 2k R5 1k R8 1k R7 12 Ω C3 4.7nF R9 24 Ω R1 0.005 Ω Q1 IRF7413 Q2 IRF7413 R2 0.007 Ω C2 0.1 µF CLOAD(5VOUT) CLOAD(3VOUT) CLOAD(VEEOUT) CLOAD(12VOUT) RESET# PCI BRIDGE CHIP PCB EDGE BACKPLANE CONNECTOR R15 1 Ω R16 1 Ω BACKPLANE CONNECTOR 5V LONG 5V 3.3V LONG 3.3V 12V –12V BD_SEL# HEALTHY# PCI_RST# GROUND I/O PIN 1 I/O PIN 128 Z3 R21 1.74 Ω R22 2.74 Ω Z4 C8 0.1 µF PER 10 POWER PINS C9 0.1 µF PER 10 POWER PINS + + + |
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