LT1374IT7(RevA) 데이터 시트보기 (PDF) - Linear Technology
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LT1374IT7 Datasheet PDF : 28 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Foldback
500
400
SWITCHING
FREQUENCY
300
200
100
0
0
FEEDBACK PIN
CURRENT
0.5 1.0 1.5 2.0 2.5
FEEDBACK PIN VOLTAGE (V)
1374 G10
Maximum Load Current
at VOUT = 10V
4.5
VOUT = 10V
L = 20µH
L = 10µH
4.0
L = 5µH
3.5
Switching Frequency
550
540
530
520
510
500
490
480
470
460
450
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1374 G11
Maximum Load Current
at VOUT = 3.3V
4.5
L = 20µH
L = 10µH
4.0
L = 5µH
3.5
LT1374
Minimum Input Voltage
with 5V Output
6.4
6.2
MINIMUM
6.0
STARTING
VOLTAGE
5.8
5.6 MINIMUM
RUNNING
5.4 VOLTAGE
5.2
5.0
1
10
100
LOAD CURRENT (mA)
1000
1374 G12
Maximum Load Current
at VOUT = 5V
4.5
L = 20µH
L = 10µH
4.0
L = 5µH
3.5
3.0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G13
BOOST Pin Current
100
DUTY CYCLE = 100%
90
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
SWITCH CURRENT (A)
1374 G16
Kool Mµ is a registered trademark of Magnetics, Inc.
VOUT = 3.3V
3.0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G14
VOUT = 5V
3.0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G15
VC Pin Shutdown Threshold
1.4
SHUTDOWN
1.2
1.0
0.8
0.6
0.4
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1374 G11
Inductor Core Loss
1.0
20
VOUT = 5V, VIN = 10V, IOUT = 1A
12
8
TYPE 52
4
0.1
POWDERED IRON 2
Kool Mµ®
1.2
0.8
0.01
CORE LOSS IS
PERMALLOY
µ = 125
INDEPENDENT OF LOAD
CURRENT UNTIL LOAD CURRENT FALLS
LOW ENOUGH FOR CIRCUIT TO GO INTO
DISCONTINUOUS MODE
0.001
0
5
10
15
20
INDUCTANCE (µH)
0.4
0.2
0.12
0.08
0.04
0.02
25
1374 G01
5
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