LM2574-12BN Micrel Inc, LM2574-12BN Datasheet - Page 5

• Manufacturer Part Number: LM2574-12BN
• Description: IC REGULATOR BUCK 0.5A 8-DIP
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of LM2574-12BN

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 12V
• Current - Output: 500mA
• Frequency - Switching: 52kHz
• Voltage - Input: 4.75 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

Typical Characteristics
July 2005
LM2574
-100
100
-25
-50
-75
1.5
0.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
20
18
16
14
12
10
75
50
25
8
6
4
1
0
-75
0
0
JU N C TI O N TEM PER ATU R E ( ˚ C )
J U N C TI O N TEM PER ATU R E ( ˚ C )
J U N C TI O N TEM PER ATU R E ( ˚ C )
-75 -50 -25 0
-75 -50 -25 0
0
Minimum Operating
-50 -25 0 25 50 75 100125 150
10
INPUT VOLTAGE ( V)
Supply Current
Output Voltage
Current Limit
Normalized
I LO AD to 0.5A
Normalized toT J = 25˚C
20
Voltage
I LO AD = 100mA
25 50 75 100125150
25 50 75 100125150
I LO AD = 100 mA
30
V OUT = 5V
V IN = 12V
V OUT = 1.23V
Measured at
Ground Pin
V OUT = 5V
T J = 25˚C
40
V IN = 25V
50
(Circuit of Figure 1)
60
20.0
17.5
15.0
12.5
10.0
0.3
1.1
0.9
0.7
0.5
7.5
5.0
2.5
14
12
10
--6
-2
-4
-6
+8
+6
+4
+2
-2
-4
-8
0
8
6
4
2
0
0
-75
JU N C TI O N TEM PER ATU R E ( ˚ C )
0
0
0
Oscillator Frequency
125˚C
150˚C
-55˚C
-40˚C
Normalized toV IN = 10V
V OUT = 5V
I LO AD = 100mA
T J = 25
25˚C
-50 -25 0 25 50 75 100125150
Saturation Voltage
SW I TC H C U R R EN T ( A)
Line Regulation
INPUT VOLTAGE ( V)
Supply Current
0.1
5
vs. Duty Cycle
20
D U TY C YC LE ( % )
I LO AD = 100 mA
10
Switch
V IN from 7V to 40V
0.2
40
Normalized at 25˚ C
15
5
0.3
60
20
V IN = 40V
V IN = 12V
0.4
80
25
100
0.5
30
-100
100
200
150
100
100
-25
-50
-75
2.0
1.5
1.0
0.5
95
90
85
80
75
70
65
60
50
75
50
25
0
0
-75
0
-75
J U N C TI O N TEM PER ATU R E ( ˚ C )
-75 -50 -25 0 25 50 75 100125150
JU N C TI O N TEM PER ATU R E ( ˚ C )
J U N C TI O N TEM PER ATU R E ( ˚ C )
0
Feedback Pin Current
-50 -25 0
-50 -25 0 25 50 75 100 125150
100 mA
I LO AD = 0.5A
Quiescent Current
I LO AD = 100 mA
5
Dropout Voltage
INPUT VOLTAGE ( V)
0.5A
10 15 20 25 30 35 40
Efficiency
V IN = 40V
Standby
V IN = 12V
V ON/OFF = 5V
25 50 75 100 125150
V OUT = 12V
V OUT = 3V
100 mA
∆V OUT = 5%
R IND = 0.2Ω
0.5A
M9999-072805
Micrel, Inc.