datasheet lm2576t
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7/29/2019 datasheet LM2576T
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1 www.semtech.com
LM2575 & LM2576
1A & 3A MiniconverterSwitching Regulators
POWER MANAGEMENT
Revision 1, January 2001
u Pin for pin replacement for Nationals LM2575/6
series
uDC-to-DC buck or buck/boost converter requiringonly 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
u Industrial temperature range
u TO-220 and TO-263 packages
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.
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 againstoverstress conditions.
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.
u Micro controller power supplies
u Medical equipment
u Industrial power supplies
u Instrumentation power supplies
Description Features
Applications
Typical Application Circuits
5752ML 6752ML
L1
H033 H001
D1
A3 A7
C NI F86 F021
CTUO
F033 F000,1
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LM2575 & LM2576
POWER MANAGEMENT
retemaraP lobmyS mumixaM stinU
egatloVtupnI VNI
54 V
egatloVtupnIniPffO/nO V FFO/NO 3.0- V FFO/NO VNI V
)etatSydaetS(nommoCotegatloVtuptuO 1- V
noitapissiDrewoP PD
detimiLyllanretnI W
tneibmAotnoitcnuJecnatsiseRlamrehT
022-OT
362-OTq
AJ55
06
W/C
esaCotnoitcnuJecnatsiseRlamrehT
022-OT
362-OTq
CJ0.2
0.2
W/C
egnaRerutarepmeTnoitcnuJgnitarepO TJ 521+ot04- C
egnaRerutarepmeTegarotS TGTS
051+ot56- C
.ceS01)gniredloS(erutarepmeTdaeL TDAEL
003 C
)ledoMydoBnamuH(gnitaRDSE VDSE
2 Vk
retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU
egatloVtuptuO VO IO A5.0= 32.3 03.3 73.3 V
3.3-6752ML VotV8NI
detaR 02.3 04.3
41.3 74.3
egatloVtuptuO VO
IO
A5.0= 09.4 00.5 01.5 V
5-6752ML VotV8NI
detaR 58.4 51.5
57.4 52.5
egatloVtuptuO VO
IO
A5.0= 67.11 00.21 42.21 V
21-6752ML VotV51 NI detaR 25.11 84.21
04.11 06.21
egatloVkcabdeeF VBF
IO
A5.0= 712.1 032.1 342.1 V
V,JDA-6752MLO
V5= VotV8NI
detaR 391.1 762.1
081.1 082.1
tnerruCsaiBkcabdeeF IB
VNI
I,V21=O
A5.0= 05 001 An
JDA-6752ML 005
Unless otherwise specified: VIN
= 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT
= 5V for ADJ option; TA
= 25C; VIN
rated = 40V;
IO
= 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
Absolute Maximum Ratings
Electrical Characteristics
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LM2575 & LM2576
POWER MANAGEMENT
Electrical Characteristics (Cont.)
retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU
egatloVtuptuO VO IO A2.0= 32.3 03.3 73.3 V
3.3-5752ML VotV8NI
detaR 02.3 04.3
41.3 74.3
egatloVtuptuO VO
IO
A2.0= 09.4 00.5 01.5 V
5-5752ML VotV8NI
detaR 58.4 51.5
57.4 52.5
egatloVtuptuO VO
IO
A2.0= 67.11 00.21 42.21 V
21-5752ML VotV51 NI detaR 25.11 84.21
04.11 06.21
egatloVkcabdeeF VBF
IO
A2.0= 712.1 032.1 342.1 V
V,JDA-5752MLO
V5= VotV8NI
detaR 391.1 762.1
081.1 082.1
tnerruCsaiBkcabdeeF IB
VNI
I,V21=O
A2.0= 05 001 An
JDA-5752ML 005
noitpO/ycneiciffE
V3.3 h VNI I,V21= O )6752MLrofA3,5752ML(A1= 77 %
V5 28
V21 VNI
I,V51=O
)6752MLrofA3,5752ML(A1= 88
V,JDAO
V5= VNI
I,V21=O
)6752MLrofA3,5752ML(A1= 28
ycneuqerFgnihctiwS fXS
74 25 85 zHk
34 26
egatloVnoitarutaS )1( VTAS
I,5752MLO
A1= 9.0 2.1 V
I,6752MLO
A3= 9.0 4.1
)nO(elcyCytuD.xaM )3( CD 39 89 %
5752MLtnerruCkaeP )1( ILC
7.1 2.2 0.3 A
3.1 2.3
6752MLtnerruCkaeP )1( ILC
2.4 8.5 9.6 A
5.3 5.7
Unless otherwise specified: VIN
= 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT
= 5V for ADJ option; TA
= 25C; VIN
rated = 40V;
IO
= 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
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LM2575 & LM2576
POWER MANAGEMENT
Notes:
(1) Output sourcing current, resistive load, no inductor or capacitor.
(2) Feedback = VO
+ 1.0V.
(3) Feedback = 0V.
Electrical Characteristics (Cont.)
retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU
tnerruCegakaeLtuptuO )2(
V0=tuptuO IL
VNI
V=NI
detaR 2 Am
V1-=tuptuO 5.7 03
tnerruCtnecseiuQ )2( IQ
5 01 Am
21
tnerruCtnecseiuQybdnatS IYBTS
05 A
)V5=niPffO/nO( 005
leveLtupnIcigoLniPffO/nO VHI 2.2 4.1 V4.2
VLI
2.1 0.1 V
8.0
tnerruCtupnIniPffO/nO IHI
VFFO/NO
)ffO(V5= 21 03 A
ILI
VFFO/NO
)nO(V0= 0 01
Unless otherwise specified: VIN
= 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT
= 5V for ADJ option; TA
= 25C; VIN
rated = 40V;
IO
= 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
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LM2575 & LM2576
POWER MANAGEMENT
TO-220-5
TO-263-5
eciveD )1( egakcaP tnerruC
XX-T5752ML 5-022-OT )3()2( A1
RT.XX-S5752ML 5-362-OT )4(
XX-T6752ML 5-022-OT )3()2( A3
RT.XX-S6752ML 5-362-OT )4(
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 = Horizonta
Staggered. Please refer to outline drawings at the end of
this datasheet.
(3) Only available in tube packaging. A tube contains 50
devices.
(4) Only available in tape and reel packaging. A ree
contains 800 devices.
6752ML,5752ML
niP noitcnuF
1 VNI
2 TUPTUO
3 NOMMOC
4 KCABDEEF
5 FFO/NO
NOMMOCsiBAT
Pin Configurations Ordering Information
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
The above component selections will be adequate for
most applications for output currents from 250mA to 3A(LM2576) or 150mA to 1A (LM2575). Applications with
VOUT
below 5V or above 24V may require component
adjustment for maximum performance; please contact
factory for application assistance.
1. Device Selection. Select an appropriate device from
the Ordering Information guide based upon voltage
option and package.
2. Thermal Conditions.Most applications will not requirea heatsink for the TO-220 package. Approximate power
dissipation is:
IN
OIN
IN
SATOO
V
VV02.0
V
VIVP +=
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
Schottky versus an ultra fast diode is efficiency. Schottkys
will provide approximately 4% to 5% improvement foVOUTS
below 12V, whereas above 12V the difference wil
become less significant. Breakdown rating must be in
excess of VIN
for margin.
4. Input Capacitor.The value shown will be adequate fomost applications. Ripple voltage at the switching
frequency is caused by the input capacitor supplying load
current during the on time of the power switch. The use
of a low ESR switching type capacitor will minimize ripple
to an acceptable level.
5. Layout. Use short connections with a central point
ground to prevent improper operation caused by stray
inductance and ground loops.
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
.
Applications Information - Buck Mode
5752ML 6752ML
L1
H033 H001
D1
A3 A7
CNI
F86 F021
CTUO
F033 F000,1
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LM2575 & LM2576
POWER MANAGEMENT
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
Applications Information (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
Turn-On Delay
Under Voltage Lockout
Turn-On Delay With Spike Filter
Applications Information (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
5752ML 6752ML
CNI
F74 F001
1D A3 A7
1L H001 H86
CTUO
F007,2 F008,6
ITUO
Am052 Am005
5752ML 6752ML
CNI
F74 F001
1D A3 A7
1L H001 H86
CTUO
F074 F007,2
I TUO Am001 Am057
Inverting buck/boost operation is a different topology of
operation than buck. This difference reduces the output
current capability of the device, in that the inductor must
supply all of the load current during the time the power
switch is off. Maximum output current is approximately:
)2576LM(
V
V12
5.3I
IN
O
OUT
+
)2575LM(
V
V12
3.1I
IN
O
OUT
+
Component stress requirements are very similar to the
buck with a few exceptions:
(1) catch diode breakdown VBR
must be greater than
VIN
+ |VOUT
|
(2) input capacitor is larger due to the increased peak
current during switch turn on. Power dissipation isapproximately:
IN
OINSAT
IN
OO
INO
OD
V
VV02.0V
V
V1I
VV
VP +
+
+
Please contact factory for additional assistance when
using the buck/boost topology.
Applications Information - Inverting Buck/Boost
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LM2575 & LM2576
POWER MANAGEMENT
Inverting Buck/Boost Shutdown
Applications Information (Cont.)
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LM2575 & LM2576
POWER MANAGEMENT
Pre-Wound Inductors:
Hurricane Electronics Lab
P.O. Box 1280
Hurricane Industrial Park
Hurricane, UT 84737
(801) 635-2003
Core Source:
Micro Metals, Inc.
1190 N. Hawk Circle
Anaheim, CA 92807
(714) 630-7420
Capacitors:
VPR Series
Mallory Capacitor Co.4760 Kentucky Avenue
Indianapolis, IN 46241
(317) 856-3731
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
PF, PL Series
Nichicon Corp.
927 E. State Pkwy.
Schaumburg, IL 60195
(708) 843-7600
LXF Series
United Chemi-con
9801 West Higgins Road
Rosemont, IL 60018
(708) 696-2000
Heat Sinks:
AAVID Engineering Co.
P.O.Box 400
One Kool Path
Laconia, NH 03247
(603) 528-3400
Thermalloy, Inc.
2021 W. Valley View Lane
Dallas, TX 76381(214) 243-4321
Diodes - Catch:
Ultra Fast/Soft Recovery
Semtech Corporation
652 Mitchell Road
Newbury Park, CA 91320
(805) 498-2111
Diodes - Schottky:
Fuji/Collmer Semiconductor
14368 Proton Road
Dallas, TX 76244
(800) 527-0521
Micro Quality
1000 N. Shiloh
Garland, TX 76046
(214) 272-7811
Support Components Information
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LM2575 & LM2576
POWER MANAGEMENT
Outline Drawing - TO-220-5 (T-XX-H Option)
Outline Drawing - TO-220-5 (T-XX Option)
Outline Drawing - TO-220-5 (T-XX-V Option)
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LM2575 & LM2576
POWER MANAGEMENT
Contact Information
Semtech Corporation
Power Management Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
Outline Drawing - TO-263-5
Minimum Land Pattern - TO-263-5
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