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LM2575D2T-ADJR4G

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© Semiconductor Components Industries, LLC, 2009
June, 2009 − Rev. 11
1 Publication Order Number:
LM2575/D
LM2575, NCV2575
1.0 A, Adjustable Output
Voltage, Step-Down
Switching Regulator
The LM2575 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 1.0 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 LM2575 are offered by several
different inductor manufacturers.
Since the LM2575 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 by the LM2575 regulator is so
low, that no heatsink is required or its size could be reduced
dramatically.
The LM2575 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 of 1.23 V to 37 V ±4%
Maximum Over Line and Load Conditions
• Guaranteed 1.0 A Output Current
• Wide Input Voltage Range: 4.75 V to 40 V
• 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 and High−Efficiency Step−Down (Buck) Regulators
• Efficient Pre−Regulator for Linear Regulators
• On−Card Switching Regulators
• Positive to Negative Converters (Buck−Boost)
• Negative Step−Up Converters
• Power Supply for Battery Chargers
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
See detailed ordering and shipping information in the package
dimensions section on page 25 of this data sheet.
ORDERING INFORMATION
1
5
TO−220
TV SUFFIX
CASE 314B
1
5
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
See general marking information in the device marking
section on page 26 of this data sheet.
DEVICE MARKING INFORMATION
http://onsemi.com
LM2575, NCV2575
http://onsemi.com
2
Figure 1. Block Diagram and Typical Application
7.0 V - 40 V
Unregulated
DC Input
L1
330 mH
GND
+V
in
1
C
in
100 mF
3ON
/OFF5
Output
2
Feedback
4
D1
1N5819
C
out
330 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
LM2575
5.0 V Regulated
Output 1.0 A Load
This device contains 162 active transistors.
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
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 (Figure 34)
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 s) − 260 °C
Maximum Junction Temperature T
J
150 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
LM2575, NCV2575
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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 14)
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
= 200 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
LM2575−3.3 (Note 1 Test Circuit Figure 14)
Output Voltage (V
in
= 12 V, I
Load
= 0.2 A, T
J
= 25°C) V
out
3.234 3.3 3.366 V
Output Voltage (4.75 V ≤ V
in
≤ 40 V, 0.2 A ≤ I
Load
≤ 1.0 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
= 1.0 A) η − 75 − %
LM2575−5 ([Note 1] Test Circuit Figure 14)
Output Voltage (V
in
= 12 V, I
Load
= 0.2 A, T
J
= 25°C) V
out
4.9 5.0 5.1 V
Output Voltage (8.0 V ≤ V
in
≤ 40 V, 0.2 A ≤ I
Load
≤ 1.0 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
= 1.0 A) η − 77 − %
LM2575−12 (Note 1 Test Circuit Figure 14)
Output Voltage (V
in
= 25 V, I
Load
= 0.2 A, T
J
= 25°C) V
out
11.76 12 12.24 V
Output Voltage (15 V ≤ V
in
≤ 40 V, 0.2 A ≤ I
Load
≤ 1.0 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
= 15V, I
Load
= 1.0 A) η − 88 − %
LM2575−15 (Note 1 Test Circuit Figure 14)
Output Voltage (V
in
= 30 V, I
Load
= 0.2 A, T
J
= 25°C) V
out
14.7 15 15.3 V
Output Voltage (18 V ≤ V
in
≤ 40 V, 0.2 A ≤ I
Load
≤ 1.0 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
= 1.0 A) η − 88 − %
LM2575 ADJUSTABLE VERSION (Note 1 Test Circuit Figure 14)
Feedback Voltage (V
in
= 12 V, I
Load
= 0.2 A, V
out
= 5.0 V, T
J
= 25°C) V
FB
1.217 1.23 1.243 V
Feedback Voltage (8.0 V ≤ V
in
≤ 40 V, 0.2 A ≤ I
Load
≤ 1.0 A, V
out
= 5.0 V) V
FB
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
= 1.0 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 LM2575 is used as shown in the Figure 14 test circuit, system performance will be as shown in system parameters section.
2. Tested junction temperature range for the LM2575 and the NCV2575: T
low
= −40°C T
high
= +125°C
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LM2575D2T-ADJR4G

Mfr. #:
Buy LM2575D2T-ADJR4G
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 1A 1.23-37V ADJ Buck PWM
Lifecycle:
New from this manufacturer.
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