LT3745 데이터 시트보기 (PDF) - Linear Technology
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LT3745 Datasheet PDF : 28 Pages
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LT3745
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Buck Efficiency
100
95
24VIN, 12VOUT at 1MHz
90
85
12VIN, 4VOUT at 500kHz
80
75
48VIN, 4VOUT at 200kHz
70
65
60
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (A)
3745 G10
Shutdown IVIN vs VIN
5
4
T = 125°C
3
2
T = –40°C
1
T = 25°C
0
0 10 20 30 40 50 60
VIN (V)
3745 G11
Quiescent IVIN vs VIN
0.43
0.42
T = 125°C
0.41
T = 25°C
0.40
0.39
T = –40°C
0.38
0 10 20 30 40 50 60
VIN (V)
3745 G12
IVCC vs VCC – Shutdown Mode
8
6
T = 125°C
4
2
T = 25°C
T = –40°C
0
3.0 3.5
4.0
4.5
5.0
5.5
VCC (V)
3745 G13
EN/UVLO UVLO Threshold
vs Temperature
1.32
UVLO+
1.30
1.28
1.26
1.24
UVLO–
1.22
1.20
–50
–25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3745 G16
IVCC vs VCC – Channel Off, Data Off
3.35
3.30
T = 125°C
3.25
3.20
T = 25°C
3.15
3.10
T = –40°C
3.05
3.00
3.0 3.5
4.0
4.5
5.0
5.5
VCC (V)
3745 G14
(VIN - VCAP) UVLO Threshold
vs Temperature
4.90
UVLO+
4.80
4.70
4.60
UVLO–
4.50
4.40
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3745 G17
VCC UVLO Threshold
vs Temperature
2.90
UVLO+
2.85
2.80
2.75
UVLO–
2.70
2.65
2.60
–50
–25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3745 G15
Oscillator Frequency fOSC vs RT
1000
800
600
400
200
0
20 60 100 140 180 220 260 300
RT (kΩ)
3745 G18
3745f
8
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