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参数资料
| 型号： | LM2574-3.3YN |
| 厂商： | MICREL INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | LEAD FREE, PLASTIC, DIP-8 |
| 文件页数： | 5/8页 |
| 文件大小： | 187K |
| 代理商： | LM2574-3.3YN |
July 2005
5
M9999-072805
LM2574
Micrel, Inc.
Typical Characteristics (Circuit of Figure 1)
Supply Current
INPUT VOLTAGE (V)
20
Measured at
Ground Pin
TJ = 25C
VOUT = 5V
18
16
14
12
10
8
6
4
0
10
20
30
40
50
60
ILOADto 0.5A
Supply Current
vs. Duty Cycle
DUTY CYCLE (%)
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
20
40
60
80
100
VIN from 7V to 40V
ILOAD= 100 mA
JUNCTION TEMPERATURE (C)
200
150
100
50
0
-75
VIN = 12V
Standby
Quiescent Current
VIN = 40V
-50 -25 0 25 50 75 100 125150
Current Limit
JUNCTION TEMPERATURE (C)
1.5
1
0.5
0
-75
VIN = 25V
INPUT VOLTAGE (V)
100
Efficiency
VOUT = 12V
-50 -25 0 25 50 75 100125 150
95
90
85
80
75
70
65
60
100 mA
VOUT = 3V
0.5A
0
5 10 15 20 25 30 35 40
Minimum Operating
Voltage
JUNCTION TEMPERATURE (C)
5.0
ILOAD= 100 mA
Line Regulation
INPUT VOLTAGE (V)
14
0
JUNCTION TEMPERATURE (C)
100
-100
-75
Feedback Pin Current
-50 -25 0 25 50 75 100 125150
VOUT = 1.23V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-75 -50 -25 0 25 50 75 100125150
12
10
8
6
4
2
0
-2
-4
-6
5
10
15
20
25
30
75
50
25
0
-25
-50
-75
JUNCTION TEMPERATURE (C)
+8
-8
-75
Oscillator Frequency
-50 -25 0 25 50 75 100125150
+6
+4
+2
0
-2
-4
--6
VIN = 12V
VIN = 40V
Normalized at 25C
Normalized toVIN = 10V
VOUT = 5V
ILOAD= 100mA
TJ = 25
VON/OFF= 5V
Switch
Saturation Voltage
SWITCH CURRENT (A)
1.1
-55C
0.9
0.7
0.5
0.3
0
0.1
0.2
0.3
0.4
0.5
25C
125C
150C
-40C
Dropout Voltage
JUNCTION TEMPERATURE (C)
2.0
-75 -50 -25 0 25 50 75 100125150
VOUT = 5%
RIND = 0.2
ILOAD= 0.5A
ILOAD= 100 mA
1.5
1.0
0.5
0
Normalized
Output Voltage
JUNCTION TEMPERATURE (C)
100
75
50
25
0
-25
-50
-75
-100
-75 -50 -25 0 25 50 75 100125150
VIN = 12V
ILOAD= 100mA
Normalized toTJ = 25C
VOUT = 5V
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