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LTC4244CGN-1#TR PDF预览

LTC4244CGN-1#TR

更新时间： 2024-11-21 13:09:51
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凌特 - Linear 电源电路电源管理电路光电二极管控制器PC
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28页 333K
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LTC4244CGN-1#TR 数据手册

 浏览型号LTC4244CGN-1#TR的Datasheet PDF文件第2页浏览型号LTC4244CGN-1#TR的Datasheet PDF文件第3页浏览型号LTC4244CGN-1#TR的Datasheet PDF文件第4页浏览型号LTC4244CGN-1#TR的Datasheet PDF文件第5页浏览型号LTC4244CGN-1#TR的Datasheet PDF文件第6页浏览型号LTC4244CGN-1#TR的Datasheet PDF文件第7页 
LTC4244/LTC4244-1  
Rugged, CompactPCI Bus  
Hot Swap Controllers  
U
FEATURES  
DESCRIPTIO  
TheLTC®4244/LTC4244-1areHotSwapTM controllersthat  
allow a board to be safely inserted into and removed from  
a CompactPCITM bus slot. External N-channel transistors  
control the 5V and 3.3V supplies while on-chip switches  
■
Controls –12V, 3.3V, 5V and 12V Supplies  
■
±14.4V Absolute Maximum Rating for 12VIN  
and –12VIN Input Pins  
Insensitive to Supply Voltage Transients  
■
■
Adjustable Foldback Current Limit with Circuit Breaker control the ±12V supplies. The 3.3V and 5V supplies can  
■
■
LOCAL_PCI_RST# Logic On-Chip  
PRECHARGE Output Biases I/O Pins During Card  
Insertion and Extraction  
LTC4244-1 Designed for Applications without –12V  
Available in 20-Lead Narrow SSOP Package  
be ramped up at an adjustable rate. Electronic circuit  
breakers protect all four supplies against overcurrent  
faults.Afterthepower-upcycleiscomplete,theTIMERpin  
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. TheOFF/ONpinisusedtocycleboardpowerorreset  
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#.  
■
■
U
APPLICATIO S  
■ Hot Board Insertion into CompactPCI Bus  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Hot Swap is a trademark of Linear Technology Corporation.  
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.  
U
TYPICAL APPLICATIO  
C8  
C9  
0.01µF PER  
POWER PIN  
0.01µF PER  
POWER PIN  
R2  
Q2  
5V  
IN  
0.007Ω IRF7457  
V
5V  
5A  
OUT  
5V  
+
+
R22  
C
C
R1  
0.005Ω  
Q1  
2.7Ω  
LOAD(5VOUT)  
LONG 5V  
3.3V  
IRF7457  
V
3.3V  
7A  
3.3V  
OUT  
IN  
R21  
1.8Ω  
Z3  
LOAD(3.3VOUT)  
C1  
LONG 3.3V  
R4  
10Ω  
R3  
10Ω  
Z4  
C6  
0.01µF  
C7  
0.01µF  
R5  
1k  
0.33µF  
Z1  
Z2  
3.3V  
3.3V  
SENSE  
GATE 3.3V  
5V  
5V  
5V  
12V  
IN  
OUT  
IN  
SENSE  
OUT  
V
OUT  
12V  
V
12V  
12V  
IN  
OUT  
+
500mA  
–12V  
EEIN  
C
C
LOAD(12VOUT)  
R19 1k  
V
OFF/ON  
FAULT  
BD_SEL#  
EEOUT  
V
–12V  
R20  
1.2k  
EEOUT  
R18 10k  
LTC4244  
100mA  
LOAD(VEEOUT)  
+
LONG V(I/O)  
R17  
10k  
TIMER  
C2  
0.082µF  
PWRGD  
HEALTHY#  
PCI_RST#  
R6  
RESETIN  
10k  
V
OUT  
3.3V  
GND PRECHARGE  
RESETOUT  
R8 1k  
DRIVE  
Q3  
R15  
R16  
1Ω  
C5  
0.01µF  
LOCAL_PCI_RST#  
R9 24Ω  
1Ω  
C3 4.7nF  
C4  
0.01µF  
V
IN  
3.3V  
GROUND  
R10 18Ω  
R7 12Ω  
R11  
10k  
R12  
10k  
R13  
10Ω  
MMBT2222A  
1V  
±10%  
RESET#  
I/O DATA LINE 1  
I/O #1  
I/O PIN 1  
PCI  
BRIDGE  
CHIP  
•
•
•
•
•
•
•
•
•
R14  
10Ω  
I/O #128  
I/O DATA LINE 128  
I/O PIN 128  
Z1, Z2: SMAJ12A Z3, Z4: SMAJ5.0A  
4244 F01  
Figure 1. Typical Compact PCI Application  
42441f  
1
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