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
3.3V and 5V Current Foldback
Profile
11
10
9
8 3VOUT
5VOUT
7
6
5
4
3
2
1
TA = 25°C
RSENSE = 0.005Ω
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
1644 G01
12VIN Supply Current
vs Temperature
3.2
3.1
3.0
2.9
2.8
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
1644 G04
3VIN UVLO Threshold Voltage
vs Temperature
2.56
2.55
RAMPING
UP
2.54
2.53
2.52
2.51
2.50
2.49
RAMPING
DOWN
2.48
2.47
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1644 G07
4
12V Output Current
1.0
TA = 25°C
0.9 12VIN = 12V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
2
4
6
8
OUTPUT VOLTAGE (V)
10 12
1644 G02
12VIN Undervoltage Lockout
vs Temperature
8.50
8.45
RAMPING
UP
8.40
8.35
RAMPING
DOWN
8.30
8.25
8.20
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G05
5V Foldback Current Limit Voltage
vs Temperature
60
TIMER = 0V
50
5VOUT = 3V
40
30
20
5VOUT = 0V
10
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G08
– 12V Output Current
0.40
TA = 25°C
0.35 VEEIN = –12V
0.30
0.25
0.20
0.15
0.10
0.05
0
0 –2 –4 –6 –8 –10 –12
OUTPUT VOLTAGE (V)
1644 G03
5VIN UVLO Threshold Voltage
vs Temperature
2.55
2.54
2.53
RAMPING
UP
2.52
2.51
2.50
2.49
RAMPING
DOWN
2.48
2.47
2.46
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1644 G06
3V Foldback Current Limit Voltage
vs Temperature
60
TIMER = 0V
50
3VOUT = 2V
40
30
20
3VOUT = 0V
10
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1644 G09
1644f
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