LTC1149 查看數據表（PDF） - Linear Technology
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LTC1149 Datasheet PDF : 20 Pages
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LTC1149
LTC1149-3.3/LTC1149-5
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
FIGURE 1 CIRCUIT
ILOAD = 1A
95
90
85
80
0
10
20
30
40
50
INPUT VOLTAGE (V)
1149 G01
Line Regulation
60
FIGURE 1 CIRCUIT
40 ILOAD = 1A
20
0
– 20
– 40
– 60
0
10
20
30
40
50
INPUT VOLTAGE (V)
1149 G02
DC Supply Current
3.0
2.5
ACTIVE MODE
2.0
1.5
1.0
SLEEP MODE
0.5
0
0
10
20
30
40
50
INPUT VOLTAGE (V)
1149 G04
Gate Charge Supply Current
30
25
20
QP + QN = 100nC
15
10
QP + QN = 50nC
5
0
50
100
150
200
250
OPERATING FREQUENCY (kHz)
1149 G07
Supply Current in Shutdown
400
VSD2 = 2V
300
200
100
0
0
10
20
30
40
50
INPUT VOLTAGE (V)
1149 G05
Off-Time vs VOUT
80
70
60
50
40
30
20
10
LTC1149-5
LTC1149-3.3
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
1149 G08
Load Regulation
20
0
FIGURE 1 CIRCUIT
VIN = 24V
– 20
– 40
– 60
– 80
– 100
0
0.5
1.0
1.5
2.0
2.5
LOAD CURRENT (A)
1149 G03
Operating Frequency
vs (VIN – VOUT)
2.0
VOUT = 5V
T = 0°C
1.5
T = 25°C
T = 70°C
1.0
0.5
0
0
5
10
15
20
25
(VIN – VOUT) VOLTAGE (V)
1149 G06
Current Sense Threshold Voltage
160
140
MAXIMUM
THRESHOLD
120
100
80
60
40
MINIMUM
THRESHOLD
20
0
0
20
40
60
80 100
TEMPERATURE (°C)
1149 G09
4
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