LTC1644IGN Просмотр технического описания (PDF) - Linear Technology
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LTC1644IGN Datasheet PDF : 24 Pages
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LTC1644
TYPICAL PERFOR A CE CHARACTERISTICS
3VOUT Discharge Resistance
vs Temperature
90
8O
70
60
50
40
30
20
10
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G37
12VOUT Discharge Resistance
vs Temperature
700
600
500
400
300
200
100
0
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
1644 G38
VEEOUT Discharge Resistance
vs Temperature
900
80O
700
600
500
400
300
200
100
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G39
VOL vs Temperature
0.30
I = 3mA
0.25
FAULT
0.20
RESETOUT
0.15
PWRGD
0.10
Precharge Reference Voltage
vs Temperature
1.005
V5VIN = 5V
1.004
1.003
0.05
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G40
1.002
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G41
PI FU CTIO S
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.
8
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 21µA 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.
1644f
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