FCI LM2575-12TA5T 1.0a step - down voltage switching regulators 1a output current Datasheet

LM2575 1.0A Step - Down Voltage Switching Regulators
Description
Features
LM2575 of regulators provides all the active functions
for a step- down (buck) switching regulator, and drives
1A load with excellent line and load regulation.
LM2575 is available in fixed output volt ages of 3.3V,
5V, 12V, 15V and a versatile Adjustable output
version. These regulators are simple to use and require
a minimum number of external components.
3.3V, 5V, 12V, 15V and Adjustable output
versions
Adjustable version output voltage range
1.23V to 37V ±4% max over line and load
conditions
1A output current
Features include internal frequency compensation and
a fixed- frequency oscillator. LM2575 high-efficiency
replacement for popular three-terminal linear regulators,
Requires Only 4 External Components
High Efficiency
and is requiring a smaller heat sink or even no heat sink.
TTL shutdown capability and low power
LM2575 performs well with standard inductors from
several manufacturers, and simplifying the design of
switch-mode power supplies. LM2575 guarantee +/-4%
standby mode
tolerance on output voltage within specified input voltages
and output load conditions, and ±10% on the oscillator
frequency.
External shutdown is included with 50 uA(typical)
standby current. The output switch has cycle-by-cycle
Thermal shutdown, current limit protection
Uses standard inductors
52 kHz fixed frequency internal oscillator
current limiting as well as thermal shutdown for full
protection under fault conditions.
Application
Pre-regulator for linear regulators
On-card/ board switching regulators
High-efficiency step-down buck regulator
Positive to negative converter (buck-boost)
TYPICAL APPLICATION
7V - 40V
Unregulated
DC Input
+VIN
1
CIN +
100 µF
Feedback
4
LM2575 -5.0
3 GND ON / OFF 5
Output
2
L1
330 µH
COUT
330 µF
GM 431
D1
1N5819
+
5.0V, 1A
Regulated
Output
LM2575 1.0A Step - Down Voltage Switching Regulators
MARKING INFORMATION & PIN CONFIGURATIONS
TO-220- 5
VIN
Output
Ground
TO-220- 5B
VIN
Output
ON/OFF
Feedback Ground
2
TO-252-5 (DPAK)
ON/OFF
Feedback
VIN
Output
Ground
V V, VVV
A
Y
WW
1 2 3 4 5
TO-263-5(D PAK)
ON/OFF
Feedback
VIN
Output
Ground
= Output Voltage (33=3.3V , 120=12V,A=Adj)
= Assembly Location
= Year
= Weekly
ORDERING INFORMATION
Ordering Number
Output Voltage
Package
LM2575-ATB5T
Adj
TO-220-5
50 Units / Tube
LM2575 -ATB5BT
Adj
TO-220-5B
50 Units / Tube
LM2575-ATA5R
Adj
TO-263-5
800 Units/ Tape & Reel
LM2575 -ATA5T
Adj
TO-263-5
50 Units / Tube
LM2575 -3.3TB5T
3.3
TO-220-5
50 Units / Tube
LM2575 -3.3TB5BT
3.3
TO-220-5B
50 Units / Tube
LM2575 -3.3TA5R
3.3
TO-263-5
800 Units/ Tape & Reel
LM2575 -3.3TA5T
3.3
TO-263-5
50 Units / Tube
LM2575 -5.0TB5T
5.0
TO-220-5
50 Units / Tube
LM2575 -5.0TB5BT
5.0
TO-220-5B
50 Units / Tube
LM2575-5.0TA5R
5.0
TO-263-5
800 Units/ Tape & Reel
LM2575-5.0TA5T
5.0
TO-263-5
50 Units / Tube
LM2575 -5.0TC5T
5.0
TO-252-5
80 Units/ Tube
LM2575 -5.0TC5R
5.0
TO-252-5
2,500 Units/ Tape & Reel
LM2575 -12TB5T
12
TO-220-5
50 Units / Tube
LM2575 -12TB5BT
12
TO-220-5B
50 Units / Tube
LM2575 -12TA5R
12
TO-263-5
800 Units/ Tape & Reel
LM2575 -12TA5T
12
TO-263-5
50 Units / Tube
LM2575 -15TB5T
15
TO-220-5
50 Units / Tube
LM2575 -15TB5BT
15
TO-220-5B
50 Units / Tube
LM2575 -15TA5R
15
TO-263-5
800 Units/ Tape & Reel
LM2575 -15TA5T
15
TO-263-5
50 Units / Tube
* TB5B: Bent and Staggered Leads of TO-220 package
** For detail Ordering Number identification, please see last page.
Shipping
ON/OFF
Feedback
LM2575 1.0A Step - Down Voltage Switching Regulators
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE
UNIT
45
V
Maximum Supply Voltage
-0.3
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
V VIN
V
-1.0
V
Internally Limited
-
-65 to + 150
°C
Maximum Junction Temperature
+150
°C
Lead Temperature (Soldering, 10 sec.)
+260
°C
VALUE
UNIT
Power Dissipation
Storage Temperature Range
RECOMMENDED OPERATING CONDITIONS
PARAMETER
-40
Temperature Range
TJ
125
°C
40
Supply Voltage
V
BLOCK DIAGRAM
Unregulated
DC Input
+
CIN
V IN
Internal
Regulator
1
5
ON/OFF
ON/OFF
4
Feedback
R2
Fixed Gain
Error AMP
Comparator
+
1.0K
R1
-
1 AMP
Switch
+
Driver
-
Output
VOUT
L1
2
1.23V
Band-Gap
Reference
D1
52kHz
Oscillator
Reset
Thermal
Shutdown
Current
Limit
3
GND
VOUT
3.3V, R2 = 1.7K
5V, R2 = 3.1K
12V, R2 = 8.84K
15V, R2 = 11.3K
For ADJ. Version
R1 = Open, R2 = 0W
+
C out
L
O
A
D
LM2575 1.0A Step - Down Voltage Switching Regulators
ELECTRICAL CHARACTERISTICS: LM2575-3.3
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Conditions
Symbol
Output Voltage
VIN = 12V, ILOAD = 0.2A
VOUT
Output Voltage
4.75V VIN 40V, 0.2A ILOAD 1A
Parameter
Efficiency
VIN = 12V, ILOAD = 1A
Typ
Max
Unit
3.234
3.3
3.366
V
VOUT
3.168/3.135
3.3
3.432/3.465
V
h
-
75
-
%
Min
ELECTRICAL CHARACTERISTICS: LM2575-5.0
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Conditions
Symbol
Output Voltage
VIN = 12V, ILOAD = 0.2A
VOUT
Output Voltage
8V VIN 40V, 0.2A ILOAD 1A
VIN = 12V, ILOAD = 1A
Parameter
Efficiency
Typ
Max
Unit
4.900
5.0
5.100
V
VOUT
4.800/4.750
5.0
5.200/5.250
V
h
-
77
-
%
Min
ELECTRICAL CHARACTERISTICS: LM2575-12
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Output Voltage
Output Voltage
Efficiency
Conditions
Symbol
VIN = 25V, ILOAD = 0.2A
15V VIN 40V, 0.2A ILOAD 1A
VIN = 15V, ILOAD = 1A
Min
Typ
Max
Unit
VOUT
11.76
12.0
12.24
V
VOUT
11.52/11.40
12.0
12.48/12.60
V
h
-
88
-
%
ELECTRICAL CHARACTERISTICS: LM2575-15
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Feedback Voltage
Feedback Voltage
Efficiency
Conditions
Symbol
VIN = 30V, ILOAD = 0.2A
Min
Typ
Max
Unit
VOUT
14.70
15.0
15.30
V
18V VIN 40V, 0.2A ILOAD 1A
VOUT
14.40/14.25
15.0
15.60/15.75
V
VIN = 18V, ILOAD = 1A
h
-
88
-
%
ELECTRICAL CHARACTERISTICS: LM2575-adj
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Parameter
Feedback Voltage
Feedback Voltage
Efficiency
4
Conditions
Symbol
VIN = 12V, ILOAD = 0.2A, VOUT = 5V
8V VIN 40V, 0.2A ILOAD 1A
VOUT = 5V
VIN = 12V, ILOAD = 1.0A, VOUT=5V
Min
Typ
Max
Unit
VOUT
1.217
1.230
1.243
V
VOUT
1.193/1.180
1.230
1.267/1.280
V
h
-
77
-
%
LM2575 1.0A Step - Down Voltage Switching Regulators
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise
specified, VIN= 12V for the 3.3V, 5.0V and ADJ version, VIN= 25V for 12V version. and VIN= 30V for 15V version. ILOAD = 500 mA)
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
Conditions
Symbol
Min
Typ
Max
Unit
VOUT = 5V (Adjustable Version Only)
IFB
-
50
100 / 500
nA
(Note 11)
FO
47 / 42
52
58 / 63
kHz
IOUT = 1A (Notes 4)
VSAT
-
0.9
1.2 / 1.4
V
(Note 5)
TDC
93
98
-
%
(Note 4, 11)
ICL
1.7 / 1.3
2.2
3.0 / 3.2
A
IOL
-
7.5
2
30
mA
(Note 6)
IQ
-
5
10
mA
ON/OFF Pin = 5V (OFF)
ISTBY
-
50
200
mA
qJA
qJA
qJC
qJC
qJA
-
65
45
2
6
37
-
°C/W
VOUT=0V
VIH
2.2 / 2.4
1.4
-
V
VOUT = Nominal Output Voltage
VIL
-
1.2
1.0 / 0.8
V
ON/OFF Pin = 5V (OFF)
VIH
-
12
30
mA
ON/OFF Pin = 0V (ON)
IIL
-
0
10
mA
(Notes 6, 7)
Output = 0 V
Output = -1V
TO-220 Package, Junction to Ambient (Note 8)
TO-220 Package, Junction to Ambient (Note 8)
Thermal Resistance
TO-220,TO-263, Package, Junction to Case
TO-252 Package, Junction to Case
TO-263 Package, Junction to Ambient (Note 10)
ON/OFF Pin
Logic Input Level
ON/OFF Pin Input Current
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indic
ate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.
Guaranteed specifications and Test conditions are shown in Electrical Characteristics.
Note 2: All limits guaranteed at 25°C (standard type face) and over full operating temperature range (bold type face).
All 25°C limits are 100% production tested. All limits over full operating temperature range are guaranteed via
correlation using standard Statistics Quality Control methods.
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
system performance. When the LM2575 is used as show in the Figure 2 test circuit, system performance will be
as shown in system parameters section of Electrical Characteristics.
Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5: Feedback pin removed from output and connected to 0V.
Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for
the 12V and 15V versions, to force the output transistor OFF.
Note 7: VIN = 40V
Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with ½ inch leads in a socket, or on a PC board with minimum copper area.
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with ¼ inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding
the leads.
Note 10: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board Copper area
thermally connected to the package. Using 0.5 square inches of copper area, qJA is 50°C//W, with 1 square inch
of copper area, qJA is 37°C/W, and with 1.6 or more square inches of copper area, qJA is 32°C/W.
Note 11: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an Overload which
causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This selfprotection feature lowers the Average power dissipation of LM2575 By lowering the minimum duty cycle from
5% down to approximately 2%.
5
LM2575 1.0A Step - Down Voltage Switching Regulators
TEST CIRCUIT AND LAYOUT GUIDELINES
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring
inductance generate voltage transients, which can cause problems. To minimize inductance and ground loops,
the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Singlepoint grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When
using the Adjustable version, place the programming resistors as close as possible to LM2575, to keep the
sensitive feedback wiring short.
Figure 1(a). Fixed Output Voltage Versions
LM2575
+VIN
1
FIXED OUTPUT
Feedback
4
L1
Output
2
GND 3
VIN
Unregulated
DC Input
VOUT
330 µH
ON/OFF 5
+
+
D1
MBR360
CIN
100 µF
COUT
330 µF
CIN - 100 µF, 75V, Aluminum Electrolytic
COUT - 330 µF, 25V, Aluminum Electrolytic
D1 - Schottky, MBR360
L1 - 330 µH, 3L Electronic Corp. TC-331M-1.0A- 5026
R1 - 2k, 0.1%
R2 - 6.12k, 0.1%
6
L
O
A
D
LM2575 1.0A Step - Down Voltage Switching Regulators
Figure 1(b).Adjustable Output Voltage Versions
Feedback
4
+VIN
LM2575-adj
1
L1
Output
2
GND 3
7V - 40V
Unregulated
DC Input
VOUT=5.0V
330 µH
ON/ OFF 5
+
CIN
100 µF
VOUT = VREF ( 1 +
R2
+
D1
MBR360
COUT
330 µF
R1
L
O
A
D
R2
)
R1
VOUT
R2 = R1 ( V
-1)
REF
where VREF = 1.23V, R1 between 1k and 5k.
Typical Performance Characteristics
Figure 2. Switch Saturation Voltage
Figure 3. Dropout Voltage
2.0
INPUT-OUTPUT DIFFERENTIAL (V)
SATURATION VOLTAGE (V)
1.2
TJ = - 55°C
1.0
TJ = - 25°C
0.8
TJ = 150°C
0.6
0.4
0
0.2
0.4
0.6
0.8
SWITCH CURRENT (A)
1.0
DVOUT = 5%
RIND = 0.2W
1.5
ILOAD = 1A
1.0
ILOAD = 200mA
0.5
0
-75 -50 -25
0
25
50
75 100 125 150
JUNCTION TEMPERATURE (°C)
LM2575 1.0A Step - Down Voltage Switching Regulators
Typical Performance Characteristics
Figure 5. Maximum Power Dissipation(TO-263)
Figure 4. Quiescent Current
20
QUIESCENT CURRENT (mA)
18
16
POWER DISSIPATION (W)
VOUT = 5V
Measured at
Ground Pin
TJ = 25°C
14
12
ILOAD = 1A
10
8
6
4
4
qJA = 32°C/ W
qJA = 37°C/ W
3
2
1
qJA = 50°C/ W
ILOAD = 200mA
qJA = 73°C/ W
0
0
10
20
30
40
50
60
0
INPUT VOLTAGE (V)
Figure 7. ON / OFF Pin Current (Sinking)
Figure 6. Minimum Operating Voltage
5.0
10 20 30 40 50 60 70 80 90 100
AMBIENT TEMPERATURE (°C)
8
Adjustable Version Only
4.5
7
-40°C
6
3.5
CURRENT(µA)
INPUT VOLTAGE (V)
4.0
3.0
2.5
2.0
1.5
1.0
0.5
5
4
3
2
VOUT = 1.23V
ILOAD = 120 mA
0
-50
8
VIN = 40V
TJ 125°C
-25
0
25 50
75 100 125
JUNCTION TEMPERATURE (°C)
1
0
0
5
10
15
20
ON / OFF PIN VOLTAGE (V)
25
LM2575 1.0A Step - Down Voltage Switching Regulators
TO-220-5 PACKAGE OUTLINE DIMENSIONS
9.97 ± 0.20
4.50 ± 0.20
9.90 ± 0.20
3.60 ± 0.20
8.0 ± 0.20
8.70
2.80 ± 0.10
7.0
+0.1
1.30 -0.05
4.60
15.90 ± 0.20
3.70 ± 0.20
8.40
1.2
3°
7.0 ± 0.20
9.20 ± 0.20
28.78 MAX
1.50 DP0.20
9.20 ± 0.20
1.30 ± 0.10
1.70
3°
3°
13.08 ± 0.20
3-R0.2
5-0.8 ± 0.10
+0.1
0.50 -0.05
2.40 ± 0.20
1.7(TYP)
3°
3°
2 - R 0.3
Unit: mm
10.00 ± 0.20
TO-263-5 PACKAGE OUTLINE DIMENSIONS
9.90
4.50
1.30
15°
0.40
1.20
3°
4.60
1.50 DP0.20
9.20
Pad Layout
0.10
15.3
3°
2.00
1.20
4.90
17.5
9
2.40
R0.30
0.75
R0.30
1.7
2.54
0.80
0.40
11.5
0.50
1.70 TYP
(1.70 ± 0.20)
3.8
10.0
8.0
7.0
4.40
1.07
1.75
3°
3°
R 0.3
0.90
R 0.45
7.2
Units: mm
9.20
15.30
10.00
4.90
Unit: mm
9
LM2575 1.0A Step - Down Voltage Switching Regulators
TO-220-5B PACKAGE OUTLINE DIMENSIONS
0.18 ± 0.004
4.57 ± 0.1
0.4 ± 0.006
10.16 ± 0.15
0.108 ± 0.006
2.74 ± 0.15
0.05 ± 0.004
1.27 ± 0.1
0.151 ± 0.002
3.84 ± 0.05
0.05 ± 0.004
1.27 ± 0.1
0.4985 ± 0.0075
12.66 ± 0.2
0.032 ± 0.004
0.81 ± 0.1
0.358 ± 0.008
9.1± 0.2
0.9645 ± 0.0075
24.5 ± 0.2
0.996 ± 0.008
25.3± 0.2
0.138 ± 0.004
3.5 ± 0.1
0.105 ± 0.006
2.76± 0.15
0.1535 ± 0.0035
3.9 ± 0.1
0.213 ± 0.004
5.4 ± 0.1
0.173 ± 0.006
4.4 ± 0.15
0.220 TYP
1.700 TYP
0.331 ± 0.006
8.4 ± 0.15
0.268 ± 0.004
0.68 ± 0.1
0.0165 ± 0.0045
0.42 ± 0.11
(
Inches
)
mm
TO-252-5 PACKAGE OUTLINE DIMENSIONS
0.256 ± 0.004
6.5 ± 0.1
0.024 Ref
0.600 Ref
0.212 ± 0.003
5.375 ± 0.075
Pad Layout
0.02 ± 0.001
0.51 ± 0.02
29° ± 0.5°
7
0.24 ± 0.004
6.10 ± 0.1
3
0.039 ± 0.002
1.0 ± 0.05
0.2835 ± 0.0035
7.20 ± 0.1
0.39 ± 0.008
9.9 ± 0.2
0.9
7
1.27
0.025 ± 0.002
0.64 ± 0.05
0.0235 ± 0.0015
0.60 ± 0.025
0.06 ± 0.004
1.525 ± 0.1
0.003 ± 0.002
0.07 ± 0.05
0.050BSC
1.270BSC
0.091 ± 0.002
2.3 ± 0.05
(
10
6.25
Units: mm
Inches
)
mm
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