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LM2576D2T-ADJR4

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© Semiconductor Components Industries, LLC, 2006
January, 2006 − Rev. 8
1 Publication Order Number:
LM2576/D
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
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
ORDERING INFORMATION
1
5
TO−220
TV SUFFIX
CASE 314B
1
5
Heatsink surface connected to Pin 3
TO−220
T SUFFIX
CASE 314D
Pin 1. V
in
2. Output
3. Ground
4. Feedback
5. ON/OFF
D
2
PAK
D2T SUFFIX
CASE 936A
Heatsink surface (shown as terminal 6 in
case outline drawing) is connected to Pin 3
1
5
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See general marking information in the device marking
section on page 25 of this data sheet.
DEVICE MARKING INFORMATION
LM2576
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2
Figure 1. Block Diagram and Typical Application
7.0 V − 40 V
Unregulated
DC Input
L1
100 mH
GN
D
+V
in
1
C
in
100 mF
3ON
/OFF5
Output
2
Feedback
4
D1
1N5822
C
out
1000 mF
Typical Application (Fixed Output Voltage Versions)
Representative Block Diagram and Typical Application
Unregulated
DC Input
+V
in
1
C
out
Feedback
4
C
in
L1
D1
R2
R1
1.0 k
Output
2
GND
3
ON/OFF
5
Reset
Latch
Thermal
Shutdown
52 kHz
Oscillator
1.235 V
Band−Gap
Reference
Freq
Shift
18 kHz
Comparator
Fixed Gain
Error Amplifier
Current
Limit
Driver
1.0 Amp
Switch
ON/OFF
3.1 V Internal
Regulator
Regulated
Output
V
out
Load
Output
Voltage Versions
3.3 V
5.0 V
12 V
15 V
R2
(W)
1.7 k
3.1 k
8.84 k
11.3 k
For adjustable version
R1 = open, R2 = 0 W
LM2576
5.0 V Regulated
Output 3.0 A Load
This device contains 162 active transistors.
MAXIMUM RATINGS
Rating Symbol Value Unit
Maximum Supply Voltage V
in
45 V
ON/OFF Pin Input Voltage − −0.3 V ≤ V ≤ +V
in
V
Output Voltage to Ground (Steady−State) − −1.0 V
Power Dissipation
Case 314B and 314D (TO−220, 5−Lead) P
D
Internally Limited W
Thermal Resistance, Junction−to−Ambient
R
q
JA
65 °C/W
Thermal Resistance, Junction−to−Case
R
q
JC
5.0 °C/W
Case 936A (D
2
PAK) P
D
Internally Limited W
Thermal Resistance, Junction−to−Ambient
R
q
JA
70 °C/W
Thermal Resistance, Junction−to−Case
R
q
JC
5.0 °C/W
Storage Temperature Range T
stg
−65 to +150 °C
Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 kW)
− 2.0 kV
Lead Temperature (Soldering, 10 seconds) − 260 °C
Maximum Junction Temperature T
J
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.
LM2576
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3
OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee
specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.)
Rating Symbol Value Unit
Operating Junction Temperature Range T
J
−40 to +125 °C
Supply Voltage V
in
40 V
SYSTEM PARAMETERS (Note 1 Test Circuit Figure 15)
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, V
in
= 12 V for the 3.3 V, 5.0 V, and Adjustable version, V
in
= 25 V
for the 12 V version, and V
in
= 30 V for the 15 V version. I
Load
= 500 mA. For typical values T
J
= 25°C, for min/max values T
J
is the
operating junction temperature range that applies Note 2, unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
LM2576−3.3 (Note 1 Test Circuit Figure 15)
Output Voltage (V
in
= 12 V, I
Load
= 0.5 A, T
J
= 25°C) V
out
3.234 3.3 3.366 V
Output Voltage (6.0 V ≤ V
in
≤ 40 V, 0.5 A ≤ I
Load
≤ 3.0 A) V
out
V
T
J
= 25°C 3.168 3.3 3.432
T
J
= −40 to +125°C 3.135 − 3.465
Efficiency (V
in
= 12 V, I
Load
= 3.0 A) η − 75 − %
LM2576−5 (Note 1 Test Circuit Figure 15)
Output Voltage (V
in
= 12 V, I
Load
= 0.5 A, T
J
= 25°C) V
out
4.9 5.0 5.1 V
Output Voltage (8.0 V ≤ V
in
≤ 40 V, 0.5 A ≤ I
Load
≤ 3.0 A) V
out
V
T
J
= 25°C 4.8 5.0 5.2
T
J
= −40 to +125°C 4.75 − 5.25
Efficiency (V
in
= 12 V, I
Load
= 3.0 A) η − 77 − %
LM2576−12 (Note 1 Test Circuit Figure 15)
Output Voltage (V
in
= 25 V, I
Load
= 0.5 A, T
J
= 25°C) V
out
11.76 12 12.24 V
Output Voltage (15 V ≤ V
in
≤ 40 V, 0.5 A ≤ I
Load
≤ 3.0 A) V
out
V
T
J
= 25°C 11.52 12 12.48
T
J
= −40 to +125°C 11.4 − 12.6
Efficiency (V
in
= 15 V, I
Load
= 3.0 A) η − 88 − %
LM2576−15 (Note 1 Test Circuit Figure 15)
Output Voltage (V
in
= 30 V, I
Load
= 0.5 A, T
J
= 25°C) V
out
14.7 15 15.3 V
Output Voltage (18 V ≤ V
in
≤ 40 V, 0.5 A ≤ I
Load
≤ 3.0 A) V
out
V
T
J
= 25°C 14.4 15 15.6
T
J
= −40 to +125°C 14.25 − 15.75
Efficiency (V
in
= 18 V, I
Load
= 3.0 A) η − 88 − %
LM2576 ADJUSTABLE VERSION (Note 1 Test Circuit Figure 15)
Feedback Voltage (V
in
= 12 V, I
Load
= 0.5 A, V
out
= 5.0 V, T
J
= 25°C) V
out
1.217 1.23 1.243 V
Feedback Voltage (8.0 V ≤ V
in
≤ 40 V, 0.5 A ≤ I
Load
≤ 3.0 A, V
out
= 5.0 V) V
out
V
T
J
= 25°C 1.193 1.23 1.267
T
J
= −40 to +125°C 1.18 − 1.28
Efficiency (V
in
= 12 V, I
Load
= 3.0 A, V
out
= 5.0 V) η − 77 − %
1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
When the LM2576 is used as shown in the Figure 15 test circuit, system performance will be as shown in system parameters section.
2. Tested junction temperature range for the LM2576: T
low
= −40°C T
high
= +125°C
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LM2576D2T-ADJR4

Mfr. #:
Buy LM2576D2T-ADJR4
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 3A 1.23-37V ADJ Buck
Lifecycle:
New from this manufacturer.
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