LM2576 Datasheet PDF - Motorola Semiconductors
| Part Number | LM2576 | |
| Description | EASY SWITCHERE 3.0 A STEP-DOWN VOLTAGE REGULATOR | |
| Manufacturers | Motorola Semiconductors | |
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LM2576
Advance Information
Easy Switcher™ 3.0 A
Step-Down Voltage 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 µA (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
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
EASY SWITCHER™
3.0 A STEP–DOWN
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 314D
Pin 1. Vin
2. Output
1
3. Ground
4. Feedback
5. ON/OFF
5
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
1
Heatsink surface
connected to Pin 3.
5
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
1
5
Heatsink surface (shown as terminal 6 in case outline
drawing) is connected to Pin 3.
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
LM2576–3.3
LM2576–5
LM2576–12
LM2576–15
LM2576–ADJ
3.3 V
5.0 V
12 V
15 V
1.23 V to 37 V
ORDERING INFORMATION
Device
Operating
Temperature Range Package
LM2576T–XX
Straight Lead
LM2576TV–XX TJ = –40° to +125°C Vertical Mount
LM2576D2T–XX
Surface Mount
XX = Voltage Option, i.e. 3.3, 5, 12, 15 V; and ADJ for
Adjustable Output.
This document contains information on a new product. Specifications and information herein
arMe OsuTbjOecRt tOo cLhAangAeNwAithLoOut GnotIiCce.DEVICE DATA
© Motorola, Inc. 1997
Rev 0
1
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LM2576
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 15)
Figure 2. Normalized Output Voltage
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)
125
Figure 3. Line Regulation
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)
40
Figure 4. Dropout Voltage
2.0
ILoad = 3.0 A
1.5
1.0
ILoad = 500 mA
0.5
L1 = 150 µH
Rind = 0.1 Ω
0
–50 –25
0
25 50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Current Limit
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)
125
Figure 6. Quiescent Current
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)
200
180
160
140
120
100
80
60
40
20
0
–50
Figure 7. Standby Quiescent Current
VON/OFF = 5.0 V
Vin = 40 V
Vin = 12 V
–25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
125
MOTOROLA ANALOG IC DEVICE DATA
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LM2576 electronic component. |
| Information | Total 27 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Product Image and Detail view |  1. Step-Down Voltage Regulator - National [ Learn More ] | |
| Download | [ LM2576.PDF Datasheet ] | |
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