LTC1643LIGN Linear Technology, LTC1643LIGN Datasheet - Page 6

• Manufacturer Part Number: LTC1643LIGN
• Description: IC CONTRLR HOTSWAP PCIBUS 16SSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC1643LIGN

• Applications: CompactPCI™
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 5V, ±12V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1643L/LTC1643L-1/LTC1643H
TYPICAL PERFORMANCE CHARACTERISTICS
PIN
12V
internal circuitry. A 0.5
12V
undervoltage lockout circuit prevents the switches from
turning on while the 12V
typically.
V
connected between V
current limit.
3V
output supply voltage. The PWRGD signal cannot go high
until the 3V
6
EEIN
2.454
2.452
2.450
2.448
2.446
2.444
2.442
OUT
600
500
400
300
200
100
U
IN
IN
0
–50
–50
3V
vs Temperature
V
vs Temperature
(Pin 2): – 12V Supply Input. A 1.2
(Pin 1): 12V Supply Input. It powers all the chip’s
FUNCTIONS
and 12V
(Pin 3): Analog Input. Used to monitor the 3.3V
EE
IN
–25
Current Foldback
–25
Undervoltage Lockout
U
OUT
0
TEMPERATURE ( C)
TEMPERATURE ( C)
0
pin exceeds 2.9V typically.
OUT
25
V
V
EEOUT
EEOUT
25
U
with a foldback current limit. An
50
EEIN
= –12V
= 0V
50
IN
75
switch is connected between
and V
W
pin voltage is less than 9.5V
75
100
1643 G25
1643 G21
U
EEOUT
125
100
with a foldback
1200
1000
800
600
400
200
70
60
50
40
30
20
10
0
0
–50
–50
12V Current Foldback
vs Temperature
5V
Voltage vs Temperature
switch is
IN
–25
–25
Foldback Current Limit
12V
12V
0
OUT
TEMPERATURE ( C)
OUT
TEMPERATURE ( C)
0
= 12V
= 0V
25
5V
5V
25
OUT
OUT
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 20 A 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
ON/ON (Pin 5): Digital Input.The LTC1643L/LTC1643L-1
have an active low enable, ON, and the LTC1643H has an
active high enable, ON. When the ON pin is pulled high or
50
= 5V
= 0V
50
75
100
75
LT1643 G23
1643 G26
125
100
IN
.
800
700
600
500
400
300
200
100
70
60
50
40
30
20
10
0
0
–50
V
0
3V
Voltage vs Temperature
OL
IN
–25
vs I
Foldback Current Limit
2
SINK
0
TEMPERATURE ( C)
3V
3V
OUT
(25 C)
OUT
I
25
4
SINK
= 3.3V
= 0V
PWRGD
(mA)
50
6
FAULT
75
8
100
LT1643 G24
1643 G27
125
10