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PDF LM2596 Data sheet ( Hoja de datos )
| Número de pieza | LM2596 | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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LM2596
3.0 A, Step-Down Switching
Regulator
The LM2596 regulator is monolithic integrated circuit ideally suited
for easy and convenient design of a step−down switching regulator
(buck converter). It is capable of driving a 3.0 A load with excellent
line and load regulation. This device is available in adjustable output
version and it is internally compensated to minimize the number of
external components to simplify the power supply design.
Since LM2596 converter is a switch −mode power supply , its
efficiency is significantly higher in comparison with popular
three−terminal linear regulators, especially with higher input voltages.
The LM2596 operates at a switching frequency of 150 kHz thus
allowing smaller sized filter components than what would be needed
with lower frequency switching regulators. A vailable in a standard
5−lead TO−220 package with several different lead bend options, and
D2PAK surface mount package.
The other features include a guaranteed $4% tolerance on output
voltage within specified input voltages and output load conditions, and
$15% on the oscillator frequency . External shutdown is included,
featuring 80 mA (typical) standby current. Self protection features
include switch cycle−by−cycle current limit for the output switch, as
well as thermal shutdown for complete protection under fault
conditions.
Features
• Adjustable Output Voltage Range 1.23 V − 37 V
• Guaranteed 3.0 A Output Load Current
• Wide Input Voltage Range up to 40 V
• 150 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability
• Low Power Standby Mode, typ 80 mA
• Thermal Shutdown and Current Limit Protection
• Internal Loop Compensation
• Moisture Sensitivity Level (MSL) Equals 1
• Pb−Free Packages are Available
Applications
• Simple High−Efficiency Step−Down (Buck) Regulator
• Efficient Pre−Regulator for Linear Regulators
• On−Card Switching Regulators
• Positive to Negative Converter (Buck−Boost)
• Negative Step−Up Converters
• Power Supply for Battery Chargers
http://onsemi.com
1
5
TO−220
TV SUFFIX
CASE 314B
Heatsink surface connected to Pin 3
1
5
TO−220
T SUFFIX
CASE 314D
Pin 1. Vin
2. Output
3. Ground
4. Feedback
5. ON/OFF
1
5
D2PAK
D2T SUFFIX
CASE 936A
Heatsink surface (shown as terminal 6 in
case outline drawing) is connected to Pin 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 23 of this data sheet.
© Semiconductor Components Industries, LLC, 2008
November, 2008 − Rev. 0
1
Publication Order Number:
LM2596/D
http://www.Datasheet4U.com
1 page  
LM2596
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 15)
1.0
0.8 Vin = 20 V
0.6
ILoad = 500 mA
Normalized at TJ = 25°C
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
-25
0
25 50
75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 2. Normalized Output Voltage
125
1.4
1.2 ILoad = 500 mA
1.0 TJ = 25°C
0.8
0.6 3.3 V and 5.0 V
0.4
0.2
0 12 V and 15 V
-0.2
-0.4
-0.6
0
5.0 10 15 20 25 30
Vin, INPUT VOLTAGE (V)
Figure 3. Line Regulation
35
40
2.0
ILoad = 3.0 A
1.5
1.0
0.5
0
-50
ILoad = 500 mA
L1 = 33 mH
Rind = 0.1 W
-25
0
25 50
75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 4. Dropout Voltage
125
6.0
Vin = 25 V
5.5
5.0
4.5
4.0
-50
-25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Current Limit
125
20
18 Vout = 5.0 V
Measured at
16 Ground Pin
TJ = 25°C
14
12 ILoad = 3.0 A
10
8.0 ILoad = 200 mA
6.0
4.0
0 5.0 10 15 20 25 30 35 40
Vin, INPUT VOLTAGE (V)
Figure 6. Quiescent Current
200
180
160
140
120
100
80
60
40
20
0
-50
VON/OFF = 5.0 V
Vin = 40 V
Vin = 12 V
-25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 7. Standby Quiescent Current
125
http://onsemi.com
5
5 Page 
LM2596
LM2596 Series Buck Regulator Design Procedures (continued)
Table 1. RECOMMENDED VALUES OF THE OUTPUT CAPACITOR AND FEEDFORWARD CAPACITOR
(Iload = 3 A)
Nichicon PM Capacitors
Vin (V)
40
1500/35/24
1000/35/29
Capacity/Voltage Range/ESR (mF/V/mW)
1000/35/29 680/35/36 560/25/55 560/25/55
470/35/46
26
1200/35/26
820/35
680/35/36 560/35/41 470/25/65 470/25/65 330/35/60
22 1000/35/29 680/35/36 560/35/41 330/25/85 330/25/85 220/35/85
20 820/35/32 470/35/46 470/25/65 330/25/85 330/25/85 220/35/85
18 820/35/32 470/35/46 470/25/65 330/25/85 330/25/85 220/35/85
12 820/35/32 470/35/46 220/35/85 220/25/111
10 820/35/32 470/35/46 220/35/85
Vout (V)
CFF (nF]
2
40
4
15
6
5
9 12 15 24
2 1.5 1 0.6
470/35/46
28
0.6
70
60 L27
L35
50 220uH
L36
L27
40
150uH
L29
30
25 100uH
L30
68uH
L42
L37
L38
L43
L44
L39
20 L31 L40
L21
15
L22
10
9 L23
8
7
6
5 L15
47uH
33uH
L24
L32
22uH
L40
L40
L34
L25 15uH
4
0.6 0.8 1.0
1.5 2.0 2.5
Maximum load current (A)
Figure 18. Inductor Value Selection Guides (For Continuous Mode Operation)
3.0
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11
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LM2596.PDF ] | |
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