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LTC1644IGN Scheda tecnica(PDF) 8 Page - Linear Technology

Il numero della parte LTC1644IGN
Spiegazioni elettronici  CompactPCI Bus Hot Swap Controller
PDF  24 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC1644IGN Scheda tecnica(HTML) 8 Page - Linear Technology

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LTC1644
8
1644f
TYPICAL PERFOR A CE CHARACTERISTICS
3VOUT Discharge Resistance
vs Temperature
12VOUT Discharge Resistance
vs Temperature
VEEOUT Discharge Resistance
vs Temperature
VOL vs Temperature
Precharge Reference Voltage
vs Temperature
TEMPERATURE (
°C)
–50
0
10
30
40
50
50
90
1644 G37
20
0
–25
75
25
100
60
70
8O
TEMPERATURE (
°C)
–50
0
100
300
400
500
50
900
1644 G39
200
0
–25
75
25
100
600
700
80O
TEMPERATURE (
°C)
–50
700
600
500
400
300
200
100
0
25
75
1644 G38
–25
0
50
100
TEMPERATURE (
°C)
–50
0
0.05
0.10
0.15
0.20
0.30
–25
025
50
1644 G40
75
100
0.25
I = 3mA
FAULT
RESETOUT
PWRGD
TEMPERATURE (
°C)
–50
1.002
1.003
1.004
1.005
–25
025
50
1644 G41
75
100
V5VIN = 5V
12VIN (Pin 1): 12V Supply Input. A 0.5Ω switch is con-
nected between 12VIN and 12VOUT with a foldback current
limit. An undervoltage lockout circuit prevents the switches
from turning on while the 12VIN pin voltage is less than
8.3V. 12VIN also provides power to the LTC1644’s internal
circuitry.
VEEIN (Pin 2): –12V Supply Input. A 1Ω switch is con-
nected between VEEIN and VEEOUT with a foldback current
limit. If no VEE supply input is available, tie the VEEIN pin to
the GND pin in order to disable the VEEOUT power good
function.
PI FU CTIO S
5VOUT (Pin 3): 5V Output Sense. The PWRGD pin will not
pull low until the 5VOUT pin voltage exceeds 4.62V. If no 5V
input supply is available, tie the 5VOUT pin to the 3VOUT pin
in order to disable the 5VOUT power good function.
TIMER (Pin 4): Current Fault Inhibit Timing Input. Connect
a capacitor from TIMER to GND. With the chip turned off
(OFF/ON = HIGH), the TIMER pin is internally held at GND.
When the chip is turned on, a 21
µA pull-up current source
is connected to TIMER. Current limit faults will be ignored
until the voltage at the TIMER pin rises to within 1V of
12VIN.



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