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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LTC4244IGN 데이터시트(PDF) 1 Page - Linear Technology |
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LTC4244IGN 데이터시트(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC4244/LTC4244-1 42441f APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO s Controls –12V, 3.3V, 5V and 12V Supplies s ±14.4V Absolute Maximum Rating for 12VIN and –12VIN Input Pins s Insensitive to Supply Voltage Transients s Adjustable Foldback Current Limit with Circuit Breaker s LOCAL_PCI_RST# Logic On-Chip s PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction s LTC4244-1 Designed for Applications without –12V s Available in 20-Lead Narrow SSOP Package , LTC and LT are registered trademarks of Linear Technology Corporation. s Hot Board Insertion into CompactPCI Bus The LTC ®4244/LTC4244-1 are Hot SwapTM controllers that allow a board to be safely inserted into and removed from a CompactPCI TM bus slot. External N-channel transistors control the 5V and 3.3V supplies while on-chip switches control the ±12V supplies. The 3.3V and 5V supplies can be ramped up at an adjustable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. After the power-up cycle is complete, the TIMER pin capacitor serves as auxiliary VCC allowing the LTC4244/ LTC4244-1 to function without interruption in the pres- ence of voltage spikes on the 12VIN supply. The PWRGD output indicates when all four supplies are within toler- ance. The OFF/ON pin is used to cycle board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extrac- tion. PCI_RST# is combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#. 3.3VIN 12VIN 12VOUT VEEIN OFF/ON Z4 5VIN R4 10 Ω CLOAD(5VOUT) VOUT 5V 5A VOUT 3.3V 7A R5 1k C1 0.33 µF R3 10 Ω R1 0.005 Ω R2 0.007 Ω Q1 IRF7457 Q2 IRF7457 3.3VOUT 3.3VSENSE GND PRECHARGE 5VIN 5VSENSE DRIVE R9 24 Ω 1V ±10% Q3 MMBT2222A C3 4.7nF VIN 3.3V 4244 F01 LTC4244 GATE 5VOUT + CLOAD(3.3VOUT) + VOUT 12V 500mA CLOAD(12VOUT) + VEEOUT TIMER RESETOUT I/O #1 I/O #128 VEEOUT –12V 100mA VOUT 3.3V CLOAD(VEEOUT) C2 0.082 µF Z3 Z2 Z1 R17 10k 3.3VIN R22 2.7 Ω C9 0.01 µF PER POWER PIN C7 0.01 µF C8 0.01 µF PER POWER PIN R21 1.8 Ω R19 1k FAULT PWRGD RESETIN R18 10k R20 1.2k R16 1 Ω C6 0.01 µF R8 1k R7 12 Ω R6 10k R10 18 Ω R11 10k R13 10 Ω R14 10 Ω • • • • • • • • • R12 10k C5 0.01 µF R15 1 Ω C4 0.01 µF I/O DATA LINE 1 I/O DATA LINE 128 Z1, Z2: SMAJ12A Z3, Z4: SMAJ5.0A I/O PIN 128 RESET# PCI BRIDGE CHIP I/O PIN 1 GROUND PCI_RST# LOCAL_PCI_RST# HEALTHY# LONG V(I/O) BD_SEL# –12V 12V LONG 3.3V LONG 5V 3.3V 5V Figure 1. Typical Compact PCI Application Hot Swap is a trademark of Linear Technology Corporation. CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group. Rugged, CompactPCI Bus Hot Swap Controllers |
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