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LM2574 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part # LM2574
Description  52kHz Simple 0.5A Buck Regulator
Download  5 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LM2574 Datasheet(HTML) 5 Page - Micrel Semiconductor

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December 2003
5
M9999-122303
LM2574
Micrel
Typical Characteristics (Circuit of Figure 1)
Supply Current
INPUT VOLTAGE (V)
20
Measured at
Ground Pin
TJ = 25˚C
VOUT = 5V
18
16
14
12
10
8
6
4
0
10
203040
5060
ILOAD to 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
0
2040
6080
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 75 100 125 150
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 75 100 125 150
95
90
85
80
75
70
65
60
100 mA
100 mA
VOUT = 3V
0.5A
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 75 100 125 150
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 75 100 125 150
12
10
8
6
4
2
0
-2
-4
-6
5
10
15202530
75
50
25
0
-25
-50
-75
JUNCTION TEMPERATURE (˚C)
+8
-8
-75
Oscillator Frequency
-50 -25
0 25 50 75 100 125 150
+6
+4
+2
0
-2
-4
--6
VIN = 12V
VIN = 40V
Normalized at 25˚C
Normalized to VIN = 10V
VOUT = 5V
ILOAD = 100mA
TJ = 25
VON/OFF = 5V
Switch
Saturation Voltage
SWITCH CURRENT (A)
1.1
-55˚C
0.9
0.7
0.5
0.3
0
0.1
0.2
0.3
0.4
0.5
25˚C
125˚C
150˚C
-40˚C
Dropout Voltage
JUNCTION TEMPERATURE (˚C)
2.0
-75 -50 -25
0 25 50 75 100 125 150
∆VOUT = 5%
RIND = 0.2Ω
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 75 100 125 150
VIN = 12V
ILOAD = 100mA
Normalized to TJ = 25˚C
VOUT = 5V


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