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LTC1646CGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1646CGN Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC1646 1 1646fa ■ CompactPCI Bus Removable Boards ■ Allows Safe Board Insertion and Removal from a Live, CompactPCI TM Bus ■ Controls 3.3V and/or 5V Supplies ■ Programmable Foldback Current Limit During Power-Up ■ Dual Level Circuit Breakers Protect Supplies from Overcurrent and Short-Circuit Faults ■ LOCAL_PCI_RST# Logic On-Chip ■ PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction ■ User Programmable Supply Voltage Power-Up Rate ■ 15V High Side Drive for External N-Channel MOSFETS ■ PWRGD, RESETOUT and FAULT Outputs CompactPCI Dual Hot Swap Controller The LTC ®1646 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a live CompactPCI bus slot. Two external N-Channel transistors control the 3.3V and 5V supplies. The supplies can be ramped-up in current limit or a programmable rate. Elec- tronic circuit breakers protect both supplies against overcurrent fault conditions. 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 logically combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST# which can be used to reset the CPCI card logic if either of the supply voltages is not within tolerance. The LTC1646 is available in the 16-pin narrow SSOP package. Figure 1 MMBT2222A 4.7nF 18 Ω 18 Ω 12 Ω 10 Ω 2.7 Ω 1.8 Ω R3 10 Ω 3k R4 10 Ω 3k 1k R1 0.005 Ω, 1% R2 0.007 Ω 1% 1k R5 1k, 5% 10k 10k 3k 1.2k 3VIN PRECHARGE OUT 1V ±10% IOUT = ± 55mA 3VIN 3VIN 3VSENSE 5VSENSE 3VOUT 3VOUT 5VOUT 3.3V 5VIN 5VIN 5V RESET# I/O PCI BRIDGE (21154) DATA BUS DATA BUS V(I/O) V(I/O) 0.1 µF 0.1 µF 0.1 µF C1 0.01 µF Q2 IRF7413 Q1 IRF7413 5V 5A 3.3V 7.6A GATE GND PRECHARGE DRIVE RESETOUT TIMER OFF/ON FAULT PWRGD RESETIN LTC1646 15 89 10 7 12 11 5 2 1 613 14 3 4 16 BD_SEL# HEALTHY# PCI_RST# 1646 F01 DATA LINE EXAMPLE COMPACT PCI BACKPLANE CONNECTOR (MALE) COMPACT PCI CIRCUIT CARD CONNECTOR (FEMALE) 5V LONG 5V 3.3V LONG 3.3V GROUND I/O PIN 1 Z1, Z2: BZX84C6V2 Z2 Z1 APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO , LTC and LT 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. |
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