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参数资料
| 型号： | LTC1643ALIGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 236K |
| 描述： | IC CTRLR HOTSWAP PCI BUS 16SSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，±12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
6
LTC1643AL
LTC1643AL-1/LTC1643AH
1643afb
TYPICAL PERFORMANCE CHARACTERISTICS
W
V
EE
Current Foldback
vs Temperature
I
SINK
(mA)
0
6
10
1643A G27
2
4
8
800
700
600
500
400
300
200
100
0
FAULT
PWRGD
V
OL
vs I
SINK
(25?/SPAN>C)
TIMER (Pin 4): Analog Current Fault Inhibit Timing Input.
Connect a capacitor from TIMER to GND. With the chip
turned off (ON = GND or ON = High) or the internal circuit
breaker tripped (FAULT = GND), the TIMER pin is internally
held at GND. When the chip is turned on, a 22礎 pull-up
current source is connected to TIMER. Current limit faults
will be ignored until the voltage at the TIMER pin rises to
within 0.9V of 12V
IN
.
ON/ON (Pin 5): Digital Input.The LTC1643AL/LTC1643AL-1
have an active low enable, ON, and the LTC1643AH has an
active high enable, ON. When the ON pin is pulled high or
PIN FUNCTIONS
U
U
12V
IN
(Pin 1): 12V Supply Input. It powers all the chips
internal circuitry. A 0.5& switch is connected between
12V
IN
and 12V
OUT
with a foldback current limit. An under-
voltage lockout circuit prevents the switches from turning
on while the 12V
IN
pin voltage is less than 9.5V typically.
V
EEIN
(Pin 2): 12V Supply Input. A 1.2& switch is
connected between V
EEIN
and V
EEOUT
with a foldback
current limit.
3V
OUT
(Pin 3): Analog Input. Used to monitor the 3.3V
output supply voltage. The PWRGD signal cannot go low
until the 3V
OUT
pin exceeds 2.9V typically.
TEMPERATURE (癈)
70
60
50
40
30
20
10
0
1 4 A 24
50
25
75
25 0
50
100 125
3V
OUT
= 3.3V
3V
OUT
= 0V
3V
IN
Foldback Current Limit
Voltage vs Temperature
TEMPERATURE (癈)
50
2.454
2.452
2.450
2.448
2.446
2.444
2.442
25
75
1643A G21
25 0
50
100 125
3V
IN
Undervoltage Lockout
vs Temperature
TEMPERATURE (癈)
70
60
50
40
30
20
10
0
1643A G23
50
25
75
25 0
50
100 125
5V
OUT
= 5V
5V
OUT
= 0V
5V
IN
Foldback Current Limit
Voltage vs Temperature
12V
Current Foldback
vs Temperature
TEMPERATURE (癈)
50
1200
1000
800
600
400
200
0
25
75
1643A G26
25
0
50
100
12V
OUT
= 12V
12V
OUT
= 0V
TEMPERATURE (癈)
50
600
500
400
300
200
100
0
25
75
1643A G25
25
0
50
100
V
EEOUT
= 12V
V
EEOUT
= 0V
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