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What is LM2596?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "Step-Down Switching Regulator".


LM2596 Datasheet PDF - ON Semiconductor

Part Number LM2596
Description Step-Down Switching Regulator
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 


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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 stepdown 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
threeterminal 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
5lead TO220 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 cyclebycycle 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
PbFree Packages are Available
Applications
Simple HighEfficiency StepDown (Buck) Regulator
Efficient PreRegulator for Linear Regulators
OnCard Switching Regulators
Positive to Negative Converter (BuckBoost)
Negative StepUp Converters
Power Supply for Battery Chargers
http://onsemi.com
1
5
TO220
TV SUFFIX
CASE 314B
Heatsink surface connected to Pin 3
1
5
TO220
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
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LM2596 equivalent
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
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LM2596


1. Step-Down Voltage Regulator - National

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