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LTC1643AHIGN Arkusz danych(PDF) 6 Page - Linear Technology

Numer części LTC1643AHIGN
Szczegółowy opis  PCI-Bus Hot Swap Controller
PDF  16 Pages
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LTC1643AHIGN Arkusz danych(HTML) 6 Page - Linear Technology

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LTC1643AL
LTC1643AL-1/LTC1643AH
1643afa
TYPICAL PERFORMANCE CHARACTERISTICS
VEE Current Foldback
vs Temperature
ISINK (mA)
0
6
10
1643A G27
24
8
800
700
600
500
400
300
200
100
0
FAULT
PWRGD
VOL vs ISINK (25°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
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 0.9V of 12VIN.
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
12VIN (Pin 1): 12V Supply Input. It powers all the chip’s
internal circuitry. A 0.5
Ω switch is connected between
12VIN and 12VOUT with a foldback current limit. An under-
voltage lockout circuit prevents the switches from turning
on while the 12VIN pin voltage is less than 9.5V typically.
VEEIN (Pin 2): – 12V Supply Input. A 1.2Ω switch is
connected between VEEIN and VEEOUT with a foldback
current limit.
3VOUT (Pin 3): Analog Input. Used to monitor the 3.3V
output supply voltage. The PWRGD signal cannot go high
until the 3VOUT pin exceeds 2.9V typically.
TEMPERATURE (
°C)
70
60
50
40
30
20
10
0
1643A G24
–50
25
75
–25
0
50
100
125
3VOUT = 3.3V
3VOUT = 0V
3VIN Foldback Current Limit
Voltage vs Temperature
TEMPERATURE (
°C)
–50
2.454
2.452
2.450
2.448
2.446
2.444
2.442
25
75
1643A G21
–25
0
50
100
125
3VIN Undervoltage Lockout
vs Temperature
TEMPERATURE (
°C)
70
60
50
40
30
20
10
0
1643A G23
–50
25
75
–25
0
50
100
125
5VOUT = 5V
5VOUT = 0V
5VIN Foldback Current Limit
Voltage vs Temperature
12V Current Foldback
vs Temperature
TEMPERATURE (
°C)
–50
1200
1000
800
600
400
200
0
25
75
1643A G26
–25
0
50
100
12VOUT = 12V
12VOUT = 0V
TEMPERATURE (
°C)
–50
600
500
400
300
200
100
0
25
75
1643A G25
–25
0
50
100
VEEOUT = –12V
VEEOUT = 0V



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