Switching Regulator. LM2576 Datasheet

LM2576 Regulator. Datasheet pdf. Equivalent

Part LM2576
Description Step-Down Switching Regulator
Feature LM2576 3.0 A, 15 V, Step−Down Switching Regulator The LM2576 series of regulators are monolithic int.
Manufacture ON Semiconductor
Datasheet
Download LM2576 Datasheet



LM2576
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
Unregulated
DC Input
Cin
LM2576
Typical Application (Fixed Output Voltage Versions)
7.0 V − 40 V
Unregulated
DC Input
Cin
100 mF
+Vin
1
Feedback
LM2576
4 L1
100 mH
Output
2
3 GN 5 ON/OFF
D
D1
1N5822
5.0 V Regulated
Output 3.0 A Load
Cout
1000 mF
Representative Block Diagram and Typical Application
+Vin
1
4
Feedback
3.1 V Internal
Regulator
ON/OFF
R2 Fixed Gain
Error Amplifier Comparator
R1
1.0 k Freq
Shift
18 kHz
1.235 V
Band−Gap
Reference
52 kHz
Oscillator
Current
Limit
Latch
Reset
Driver
1.0 Amp
Switch
Thermal
Shutdown
ON/OFF
5
Output
Voltage Versions
R2
(W)
3.3 V 1.7 k
5.0 V 3.1 k
12 V 8.84 k
15 V 11.3 k
For adjustable version
R1 = open, R2 = 0 W
Output
2
GND
3
L1
D1
Regulated
Output
Vout
Cout
Load
This device contains 162 active transistors.
Figure 1. Block Diagram and Typical Application
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady−State)
Vin 45 V
−0.3 V V +Vin
V
− −1.0 V
Power Dissipation
Case 314B and 314D (TO−220, 5−Lead)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 936A (D2PAK)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Storage Temperature Range
Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 kW)
PD
RqJA
RqJC
PD
RqJA
RqJC
Tstg
Internally Limited
65
5.0
Internally Limited
70
5.0
−65 to +150
2.0
W
°C/W
°C/W
W
°C/W
°C/W
°C
kV
Lead Temperature (Soldering, 10 seconds)
− 260 °C
Maximum Junction Temperature
TJ 150 °C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
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