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What is LM2576?

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


LM2576 Datasheet PDF - ON Semiconductor

Part Number LM2576
Description Step-Down Switching Regulator
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 


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LM2576
3.0 A, 15 V, Step−Down
Switching Regulator
The LM2576 series of regulators are monolithic integrated circuits
ideally suited for easy and convenient design of a step−down
switching regulator (buck converter). All circuits of this series are
capable of driving a 3.0 A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3 V, 5.0 V,
12 V, 15 V, and an adjustable output version.
These regulators were designed to minimize the number of external
components to simplify the power supply design. Standard series of
inductors optimized for use with the LM2576 are offered by several
different inductor manufacturers.
Since the LM2576 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.
In many cases, the power dissipated is so low that no heatsink is
required or its size could be reduced dramatically.
A standard series of inductors optimized for use with the LM2576
are available from several different manufacturers. This feature
greatly simplifies the design of switch−mode power supplies.
The LM2576 features include a guaranteed ±4% tolerance on output
voltage within specified input voltages and output load conditions, and
±10% on the oscillator frequency (±2% over 0°C to 125°C). External
shutdown is included, featuring 80 mA (typical) standby current. The
output switch includes cycle−by−cycle current limiting, as well as
thermal shutdown for full protection under fault conditions.
Features
3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
Adjustable Version Output Voltage Range, 1.23 to 37 V ±4%
Maximum Over Line and Load Conditions
Guaranteed 3.0 A Output Current
Wide Input Voltage Range
Requires Only 4 External Components
52 kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit Protection
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
© Semiconductor Components Industries, LLC, 2006
January, 2006 − Rev. 8
1
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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 24 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 25 of this data sheet.
Publication Order Number:
LM2576/D
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LM2576 equivalent
LM2576
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, 5.0 V and ADJ
0.4
0.2
0 12 V and 15 V
−0.2
−0.4
−0.6
0 5.0 10 15 20 25 30 35
Vin, INPUT VOLTAGE (V)
Figure 3. Line Regulation
40
2.0
ILoad = 3.0 A
1.5
1.0
ILoad = 500 mA
0.5
L1 = 150 mH
Rind = 0.1 W
0
−50 −25
0
25 50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 4. Dropout Voltage
6.5
Vin = 25 V
6.0
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
16
14
12
10
8.0
6.0
4.0
0
Vout = 5.0 V
Measured at
Ground Pin
TJ = 25°C
ILoad = 3.0 A
ILoad = 200 mA
5.0 10 15 20 25 30 35
Vin, INPUT VOLTAGE (V)
Figure 6. Quiescent Current
40
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
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1. Step-Down Voltage Regulator - National

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