LM2576BU Micrel Inc, LM2576BU Datasheet - Page 6

• Manufacturer Part Number: LM2576BU
• Description: IC REG BUCK 3A ADJ TO-263-5
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of LM2576BU

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.23 ~ 37 V
• Current - Output: 3A
• Frequency - Switching: 42kHz ~ 63kHz
• Voltage - Input: 4 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: D²Pak, TO-263 (5 leads + tab)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LM2576
Typical Performance Characteristics (continued)
M9999-082605-B
-100
100
-25
-50
-75
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
3
2
1
0
-75
0
0
-75 -50 -25 0
-75 -50 -25 0 25 50 75 100 125 150
0
Supply Current
Current Limit
Minimum Operating
Voltage
Normalized
Output Voltage
-50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
JUNCTION TEMPERATURE (˚C)
10
JUNCTION TEMPERATURE (˚C)
I LOAD to 1A
INPUT VOLTAGE (V)
Normalized to T J = 25˚C
20
I LOAD = 200mA
25 50 75 100 125 150
I LOAD = 200 mA
30
V IN = 12V
V OUT = 1.23V
Measured at
Ground Pin
V OUT = 5V
T J = 25˚C
40
VI N = 25V
50
60
20.0
17.5
15.0
12.5
10.0
0.4
1.2
1.0
0.8
0.6
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
0
0
0
Supply Current
vs. Duty Cycle
Switch
Saturation Voltage
Line Regulation
Oscillator Frequency
125˚C
150˚C
-55˚C
-40˚C
Normalized to V IN = 10V
V OUT = 5V
I LOAD = 500mA
T J = 25
25˚C
-50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
0.2
5
20
DUTY CYCLE (%)
SWITCH CURRENT (A)
INPUT VOLTAGE (V)
10
I LOAD = 200 mA
V IN from 7V to 40V
40
0.4
6
Normalized at 25˚C
15
0.6
60
20
V IN = 40V
V IN = 12V
(Circuit of Figure 1 )
80
0.8
25
100
1.0
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
-75 -50 -25 0 25 50 75 100 125 150
0
Feedback Pin Current
Dropout Voltage
Standby
Quiescent Current
Efficiency
-50 -25 0 25 50 75 100 125 150
-50 -25 0 25 50 75 100 125 150
200 mA
I LOAD = 1A
5
I LOAD = 200 mA
JUNCTION TEMPERATURE (˚C)
JUNCTION TEMPERATURE (˚C)
JUNCTION TEMPERATURE (˚C)
1A
10 15 20 25 30
INPUT VOLTAGE (V)
V IN = 40V
V IN = 12V
V ON/OFF = 5V
V OUT = 12V
V OUT = 3V
R IND = 0.2
V OUT = 5%
200 mA
35 40
1A
August 2005
Micrel, Inc.