LM2576S-12TRT [SEMTECH]
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| 型号： | LM2576S-12TRT |
| 厂家： | 
SEMTECH CORPORATION |
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LM2575 & LM2576
1A & 3A Miniconverter
Switching Regulators
POWER MANAGEMENT
Description
Features
The LM2575/6 series switching regulators are monolithic
integrated circuits designed for use in buck or buck/
boost regulator applications requiring accurate output
voltages over combined variations of line, load and
temperature. This unique series greatly simplifies
switching power supply design. The LM2575 has a
maximum output current of 1A and the LM2576 is rated
for 3A.
u Pin for pin replacement for Nationals LM2575/6
series
u DC-to-DC buck or buck/boost converter requiring
only 4 support components
u Fixed or adjustable voltages
u Preset output voltages of 3.3V, 5V and 12V
u Wide output voltage range, 1.23V to 35V
u 82% typical efficiency @ 5V out
u Wide input voltage range, 4V to 40V
u Inhibit/enable control pin
The LM2575/6 series miniconverters include a
switching regulator and compensation network all within
the same package. Just add a choke, catch diode and
two capacitors to obtain an efficient DC-to-DC converter.
The current limit and thermal shutdown features of the
LM2575/6 series fully protect the device against
overstress conditions.
u Industrial temperature range
u TO-220 and TO-263 packages
Applications
u Micro controller power supplies
u Medical equipment
u Industrial power supplies
u Instrumentation power supplies
The LM2575/6 series offers an alternative to popular 3
terminal linear regulators by providing higher efficiency
with reduced heatsink size. In many applications a heat
sink will not be required.
Typical Application Circuits
LM2575 LM2576
L1
D1
330µH
3A
100µH
7A
CIN
68µF
120µF
COUT 330µF 1,000µF
Revision 1, January 2001
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LM2575 & LM2576
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter
Symbol
VIN
Maximum
Units
Input Voltage
45
V
V
On/Off Pin Input Voltage
Output Voltage to Common (Steady State)
Power Dissipation
VON/OFF
-0.3 £ VON/OFF £ VIN
-1
V
PD
Internally Limited
W
Thermal Resistance Junction to Ambient
TO-220
TO-263
55
60
°C/W
°C/W
qJA
Thermal Resistance Junction to Case
TO-220
TO-263
2.0
2.0
qJC
Operating Junction Temperature Range
Storage Temperature Range
TJ
-40 to +125
°C
°C
°C
kV
TSTG
TLEAD
VESD
-65 to +150
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
300
2
Electrical Characteristics
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V;
IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
IO = 0.5A
Min
3.23
3.20
3.14
4.90
4.85
4.75
Typ
Max Units
Output Voltage
LM2576-3.3
VO
3.30
3.37
3.40
3.47
5.10
5.15
5.25
V
V
8V to VIN Rated
Output Voltage
LM2576-5
VO
VO
VFB
IB
IO = 0.5A
5.00
8V to VIN Rated
Output Voltage
LM2576-12
IO = 0.5A
11.76 12.00 12.24
V
15V to VIN Rated
11.52
12.48
11.40
12.60
Feedback Voltage
IO = 0.5A
1.217 1.230 1.243
V
LM2576-ADJ, VO = 5V
8V to VIN Rated
1.193
1.267
1.280
100
1.180
Feedback Bias Current
LM2576-ADJ
VIN = 12V, IO = 0.5A
50
nA
500
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LM2575 & LM2576
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V;
IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
IO = 0.2A
Min
3.23
3.20
3.14
4.90
4.85
4.75
Typ
Max Units
Output Voltage
LM2575-3.3
VO
3.30
3.37
3.40
3.47
5.10
5.15
5.25
V
8V to VIN Rated
Output Voltage
LM2575-5
VO
VO
VFB
IB
IO = 0.2A
5.00
V
V
8V to VIN Rated
Output Voltage
LM2575-12
IO = 0.2A
11.76 12.00 12.24
15V to VIN Rated
11.52
12.48
11.40
12.60
Feedback Voltage
IO = 0.2A
1.217 1.230 1.243
V
LM2575-ADJ, VO = 5V
8V to VIN Rated
1.193
1.267
1.280
100
1.180
Feedback Bias Current
LM2575-ADJ
Efficiency/Option
3.3V
VIN = 12V, IO = 0.2A
50
nA
%
500
VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
77
82
88
82
52
h
5V
12V
VIN = 15V, IO = 1A (LM2575, 3A for LM2576)
VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
ADJ, VO = 5V
Switching Frequency
fSX
47
58
62
kHz
V
43
Saturation Voltage(1)
VSAT
LM2575, IO = 1A
LM2576, IO = 3A
0.9
0.9
98
1.2
1.4
Max. Duty Cycle (On)(3)
Peak Current LM2575(1)
DC
ICL
93
1.7
1.3
4.2
3.5
%
A
2.2
3.0
3.2
6.9
7.5
Peak Current LM2576(1)
ICL
5.8
A
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LM2575 & LM2576
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V;
IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max Units
Output Leakage Current(2)
Output = 0V
IL
VIN = VIN Rated
2
mA
mA
µA
V
Output = -1V
7.5
5
30
10
12
Quiescent Current(2)
IQ
Standby Quiescent Current
(On/Off Pin = 5V)
ISTBY
VIH
VIL
50
1.4
1.2
500
On/Off Pin Logic Input Level
2.2
2.4
1.0
0.8
30
V
On/Off Pin Input Current
I
VON/OFF = 5V (Off)
VON/OFF = 0V (On)
12
0
µA
IH
I
10
IL
Notes:
(1) Output sourcing current, resistive load, no inductor or capacitor.
(2) Feedback = VO + 1.0V.
(3) Feedback = 0V.
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LM2575 & LM2576
POWER MANAGEMENT
Pin Configurations
Ordering Information
Device(1)
Package
Current
LM2575T-XX
LM2575S-XX.TR
LM2576T-XX
TO-220-5(2)(3)
TO-263-5(4)
TO-220-5(2)(3)
TO-263-5(4)
1A
3A
LM2576S-XX.TR
Notes:
(1) -XX = Voltage Option. Available voltages are 3.3V
(-3.3), 5V (-5.0), 12V (-12), and ADJ (-ADJ), which is
adjustable between 1.23V and 35V.
(2) Lead bend options for TO-220-5 are: T-XX = Straight
in-line; T-XX-V = Vertical Staggered; T-XX-H = Horizontal
Staggered. Please refer to outline drawings at the end of
this datasheet.
TO-263-5
LM2575, LM2576
Pin
1
Function
VIN
TO-220-5
(3) Only available in tube packaging. A tube contains 50
devices.
(4) Only available in tape and reel packaging. A reel
contains 800 devices.
2
OUTPUT
COMMON
FEEDBACK
ON/OFF
3
4
5
TAB is COMMON
Block Diagram
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LM2575 & LM2576
POWER MANAGEMENT
Typical Characteristics - LM2575
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LM2575 & LM2576
POWER MANAGEMENT
Typical Characteristics - LM2575 (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
Typical Characteristics - LM2575 (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
Typical Characteristics - LM2576
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LM2575 & LM2576
POWER MANAGEMENT
Typical Characteristics - LM2576 (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
Typical Characteristics - LM2576 (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
Applications Information - Buck Mode
LM2575 LM2576
L1
D1
330µH
3A
100µH
7A
CIN
68µF
120µF
COUT 330µF 1,000µF
The above component selections will be adequate for Schottky versus an ultra fast diode is efficiency. Schottkys
most applications for output currents from 250mA to 3A will provide approximately 4% to 5% improvement for
(LM2576) or 150mA to 1A (LM2575). Applications with VOUTS below 12V, whereas above 12V the difference will
VOUT below 5V or above 24V may require component become less significant. Breakdown rating must be in
adjustment for maximum performance; please contact excess of VIN for margin.
factory for application assistance.
4. Input Capacitor. The value shown will be adequate for
1. Device Selection. Select an appropriate device from most applications. Ripple voltage at the switching
the Ordering Information guide based upon voltage frequency is caused by the input capacitor supplying load
option and package.
current during the on time of the power switch. The use
of a low ESR switching type capacitor will minimize ripple
2. Thermal Conditions. Most applications will not require to an acceptable level.
a heatsink for the TO-220 package. Approximate power
dissipation is:
5. Layout. Use short connections with a central point
ground to prevent improper operation caused by stray
inductance and ground loops.
VO
VIN
VOIO VSAT
P =
+ 0.02VIN
VIN
6. Output Capacitor. Ripple voltage on VOUT is directly
related to the value of COUT and the internal resistance
ESR of COUT. Output noise can be lowered by increasing
COUT or by selecting a capacitor with a lower ESR. ESR
must be a minimum of 0.03W for the LM2576 or 0.07W
for the LM2575 to maintain stability, otherwise raise the
value of COUT.
3. Catch Diode. If the output must be capable of a
sustained short, the IF rating must be above 3A for the
LM2575 and 7A for the LM2576. The use of an ultra
fast diode with soft recovery characteristics or a Schottky
will be adequate. The major impact on the selection of a
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LM2575 & LM2576
POWER MANAGEMENT
Applications Information (Cont.)
7. Switching Spikes. Switching spikes will also occur due
to distributive capacitance across turns of the inductor
when combined with output capacitor series inductance
(ESL). Reduction to a level at or below the switching ripple
can be achieved by using a post filter as shown below.
Switching Spike Reduction
Typical Buck Shutdown
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LM2575 & LM2576
POWER MANAGEMENT
Applications Information (Cont.)
Turn-On Delay
Under Voltage Lockout
Turn-On Delay With Spike Filter
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LM2575 & LM2576
POWER MANAGEMENT
Applications Information - Inverting Buck/Boost
LM2575
LM2576
CIN
D1
47µF
3A
100µF
7A
L1
100µH
2,700µF
250mA
68µH
COUT
IOUT
6,800µF
500mA
LM2575
LM2576
CIN
D1
47µF
3A
100µF
7A
L1
100µH
470µF
100mA
68µH
COUT
IOUT
2,700µF
750mA
Inverting buck/boost operation is a different topology of Component stress requirements are very similar to the
operation than buck. This difference reduces the output buck with a few exceptions:
current capability of the device, in that the inductor must
supply all of the load current during the time the power (1) catch diode breakdown VBR must be greater than
switch is off. Maximum output current is approximately: VIN + |VOUT|
(2) input capacitor is larger due to the increased peak
current during switch turn on. Power dissipation is
approximately:
3.5
IOUT
≈
≈
(LM2576 )
(LM2575 )
VO
VIN
2
1+
VO
VO
VIN
VO
VIN
PD
≈
IO 1 +
VSAT + 0 .02 VIN
VO + VIN
1.3
IOUT
VO
VIN
Please contact factory for additional assistance when
using the buck/boost topology.
2 1+
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LM2575 & LM2576
POWER MANAGEMENT
Applications Information (Cont.)
Inverting Buck/Boost Shutdown
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LM2575 & LM2576
POWER MANAGEMENT
Support Components Information
Pre-Wound Inductors:
Hurricane Electronics Lab
P.O. Box 1280
Hurricane Industrial Park
Hurricane, UT 84737
(801) 635-2003
LXF Series
United Chemi-con
9801 West Higgins Road
Rosemont, IL 60018
(708) 696-2000
Heat Sinks:
Core Source:
AAVID Engineering Co.
P.O.Box 400
One Kool Path
Laconia, NH 03247
(603) 528-3400
Micro Metals, Inc.
1190 N. Hawk Circle
Anaheim, CA 92807
(714) 630-7420
Capacitors:
Thermalloy, Inc.
VPR Series
2021 W. Valley View Lane
Dallas, TX 76381
(214) 243-4321
Mallory Capacitor Co.
4760 Kentucky Avenue
Indianapolis, IN 46241
(317) 856-3731
Diodes - Catch:
Ultra Fast/Soft Recovery
Semtech Corporation
652 Mitchell Road
Newbury Park, CA 91320
(805) 498-2111
511D & 673 Series
Sprague Electric Co.
North Adams, MA
(413) 664-4411
HFQ, HFZ Series
Panasonic Industrial Co.
2 Panasonic Way
Secaucus, NJ 07094
(201) 392-6142
Diodes - Schottky:
Fuji/Collmer Semiconductor
14368 Proton Road
Dallas, TX 76244
(800) 527-0521
PF, PL Series
Micro Quality
Nichicon Corp.
1000 N. Shiloh
Garland, TX 76046
(214) 272-7811
927 E. State Pkwy.
Schaumburg, IL 60195
(708) 843-7600
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LM2575 & LM2576
POWER MANAGEMENT
Outline Drawing - TO-220-5 (T-XX Option)
Outline Drawing - TO-220-5 (T-XX-H Option)
Outline Drawing - TO-220-5 (T-XX-V Option)
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LM2575 & LM2576
POWER MANAGEMENT
Outline Drawing - TO-263-5
Minimum Land Pattern - TO-263-5
Contact Information
Semtech Corporation
Power Management Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
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相关型号：
LM2576S-3.3TRT
Switching Regulator, Voltage-mode, 7.5A, 62kHz Switching Freq-Max, PSSO5, TO-263, 5 PIN
SEMTECH
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