LM1575/LM2575/LM2575HV
LM1575/LM2575/LM2575HV
SIMPLE SWITCHER
®
1A Step-Down Voltage Regulator
General Description
The LM2575 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving a 1A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5V, 12V, 15V, and an
adjustable output version.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation and a fixed-frequency oscillator.
The LM2575 series offers a high-efficiency replacement for
popular three-terminal linear regulators. It substantially re-
duces the size of the heat sink, and in many cases no heat
sink is required.
A standard series of inductors optimized for use with the
LM2575 are available from several different manufacturers.
This feature greatly simplifies the design of switch-mode
power supplies.
Other features include a guaranteed
±
4% tolerance on out-
put voltage within specified input voltages and output load
conditions, and
±
10% on the oscillator frequency. External
shutdown is included, featuring 50 µA (typical) standby cur-
rent.
Features
n
3.3V, 5V, 12V, 15V, and adjustable output versions
n
Adjustable version output voltage range,
1.23V to 37V (57V for HV version)
±
4% max over
line and load conditions
n
Guaranteed 1A output current
n
Wide input voltage range, 40V up to 60V for HV version
n
Requires only 4 external components
n
52 kHz fixed frequency internal oscillator
n
TTL shutdown capability, low power standby mode
n
High efficiency
n
Uses readily available standard inductors
n
Thermal shutdown and current limit protection
n
P
+
Product Enhancement tested
Applications
n
n
n
n
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (Buck-Boost)
Typical Application
Versions)
(Fixed Output Voltage
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1
2018 NOV
LM1575/LM2575/LM2575HV
Block Diagram and Typical Application
3.3V, R2 = 1.7k
5V, R2 = 3.1k
12V, R2 = 8.84k
15V, R2 = 11.3k
For ADJ. Version
R1 = Open, R2 = 0Ω
Note:
Pin numbers are for the TO-220 package.
FIGURE 1.
Connection Diagrams
(XXindicatesoutputvoltageoption.)
Bent, Staggered Leads
5-Lead TO-220 (T)
Straight Leads
5–Lead TO-220 (T)
Top View
LM2575T-XX or LM2575HVT-XX
Top View
TO-263(S)
5-Lead Surface-Mount Package
Side View
LM2575T-XX Flow LB03 or
LM2575HVT-XX Flow LB03
Top View
Side View
LM2575S-XX or LM2575HVS-XX
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2018 NOV
LM1575/LM2575/LM2575HV
Absolute Maximum Ratings
Maximum Supply Voltage
LM1575/LM2575
LM2575HV
ON /OFF Pin Input Voltage
Output Voltage to Ground
(Steady State)
Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Minimum ESD Rating
(C = 100 pF, R = 1.5 kΩ)
2 kV
−1V
Internally Limited
−65˚C to +150˚C
150˚C
45V
63V
−0.3V
≤
V
≤
+V
IN
Lead Temperature
(Soldering, 10 sec.)
260˚C
(Note 1)
Operating Ratings
Temperature Range
LM1575
LM2575/LM2575HV
Supply Voltage
LM1575/LM2575
LM2575HV
40V
60V
−55˚C
≤
T
J
≤
+150˚C
−40˚C
≤
T
J
≤
+125˚C
LM1575-3.3, LM2575-3.3, LM2575HV-3.3
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range
.
Symbol
Parameter
Conditions
Typ
LM1575-3.3
Limit
(Note 2)
SYSTEM PARAMETERS
(Note 4) Test Circuit
Figure 2
V
OUT
Output Voltage
V
IN
= 12V, I
LOAD
= 0.2A
Circuit of
Figure 2
V
OUT
Output Voltage
LM1575/LM2575
V
OUT
Output Voltage
LM2575HV
η
Efficiency
4.75V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
1A
Circuit of
Figure 2
4.75V
≤
V
IN
≤
60V, 0.2A
≤
I
LOAD
≤
1A
Circuit of
Figure 2
V
IN
= 12V, I
LOAD
= 1A
75
3.3
3.200/3.168
3.416/3.450
3.168/3.135
3.450/3.482
3.3
3.200/3.168
3.400/3.432
3.168/3.135
3.432/3.465
3.3
3.267
3.333
3.234
3.366
V
V(Min)
V(Max)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
LM2575-3.3
LM2575HV-3.3
Limit
(Note 3)
Units
(Limits)
LM1575-5.0, LM2575-5.0, LM2575HV-5.0
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
Typ
LM1575-5.0
Limit
(Note 2)
SYSTEM PARAMETERS
(Note 4) Test Circuit
Figure 2
V
OUT
Output Voltage
V
IN
= 12V, I
LOAD
= 0.2A
Circuit of
Figure 2
V
OUT
Output Voltage
LM1575/LM2575
V
OUT
Output Voltage
LM2575HV
0.2A
≤
I
LOAD
≤
1A,
8V
≤
V
IN
≤
40V
Circuit of
Figure 2
0.2A
≤
I
LOAD
≤
1A,
8V
≤
V
IN
≤
60V
Circuit of
Figure 2
5.0
4.850/4.800
5.175/5.225
4.800/4.750
5.225/5.275
5.0
4.850/4.800
5.150/5.200
4.800/4.750
5.200/5.250
5.0
4.950
5.050
4.900
5.100
V
V(Min)
V(Max)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
LM2575-5.0
LM2575HV-5.0
Limit
(Note 3)
Units
(Limits)
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2018 NOV
LM1575/LM2575/LM2575HV
LM1575-5.0, LM2575-5.0, LM2575HV-5.0
Electrical Characteristics
(Continued)
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
Typ
LM1575-5.0
Limit
(Note 2)
η
Efficiency
V
IN
= 12V, I
LOAD
= 1A
77
LM2575-5.0
LM2575HV-5.0
Limit
(Note 3)
%
Units
(Limits)
LM1575-12, LM2575-12, LM2575HV-12
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range
.
Symbol
Parameter
Conditions
Typ
LM1575-12
Limit
(Note 2)
SYSTEM PARAMETERS
(Note 4) Test Circuit
Figure 2
V
OUT
Output Voltage
V
IN
= 25V, I
LOAD
= 0.2A
Circuit of
Figure 2
V
OUT
Output Voltage
LM1575/LM2575
V
OUT
Output Voltage
LM2575HV
η
Efficiency
0.2A
≤
I
LOAD
≤
1A,
15V
≤
V
IN
≤
40V
Circuit of
Figure 2
0.2A
≤
I
LOAD
≤
1A,
15V
≤
V
IN
≤
60V
Circuit of
Figure 2
V
IN
= 15V, I
LOAD
= 1A
88
12
11.64/11.52
12.42/12.54
11.52/11.40
12.54/12.66
12
11.64/11.52
12.36/12.48
11.52/11.40
12.48/12.60
12
11.88
12.12
11.76
12.24
V
V(Min)
V(Max)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
LM2575-12
LM2575HV-12
Limit
(Note 3)
Units
(Limits)
LM1575-15, LM2575-15, LM2575HV-15
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range
.
Symbol
Parameter
Conditions
Typ
LM1575-15
Limit
(Note 2)
SYSTEM PARAMETERS
(Note 4) Test Circuit
Figure 2
V
OUT
Output Voltage
V
IN
= 30V, I
LOAD
= 0.2A
Circuit of
Figure 2
V
OUT
Output Voltage
LM1575/LM2575
V
OUT
Output Voltage
LM2575HV
η
Efficiency
0.2A
≤
I
LOAD
≤
1A,
18V
≤
V
IN
≤
40V
Circuit of
Figure 2
0.2A
≤
I
LOAD
≤
1A,
18V
≤
V
IN
≤
60V
Circuit of
Figure 2
V
IN
= 18V, I
LOAD
= 1A
4
LM2575-15
LM2575HV-15
Limit
(Note 3)
Units
(Limits)
15
14.85
15.15
15
14.55/14.40
15.45/15.60
15
14.55/14.40
15.525/15.675
88
14.40/14.25
15.68/15.83
14.40/14.25
15.60/15.75
14.70
15.30
V
V(Min)
V(Max)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
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2018 NOV
LM1575/LM2575/LM2575HV
LM1575-ADJ, LM2575-ADJ, LM2575HV-ADJ
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Temperature
Range.
Symbol
Parameter
Conditions
Typ
LM1575-ADJ
Limit
(Note 2)
SYSTEM PARAMETERS
(Note 4) Test Circuit
Figure 2
V
OUT
Feedback Voltage
V
IN
= 12V, I
LOAD
= 0.2A
V
OUT
= 5V
Circuit of
Figure 2
V
OUT
Feedback Voltage
LM1575/LM2575
V
OUT
Feedback Voltage
LM2575HV
η
Efficiency
0.2A
≤
I
LOAD
≤
1A,
8V
≤
V
IN
≤
40V
V
OUT
= 5V, Circuit of
Figure 2
0.2A
≤
I
LOAD
≤
1A,
8V
≤
V
IN
≤
60V
V
OUT
= 5V, Circuit of
Figure 2
V
IN
= 12V, I
LOAD
= 1A, V
OUT
= 5V
77
1.230
1.205/1.193
1.261/1.273
1.193/1.180
1.273/1.286
1.230
1.205/1.193
1.255/1.267
1.193/1.180
1.267/1.280
1.230
1.217
1.243
1.217
1.243
V
V(Min)
V(Max)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
Units
LM2575HV-ADJ (Limits)
Limit
(Note 3)
LM2575-ADJ
All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version, V
IN
= 25V for the 12V version,
and V
IN
= 30V for the 15V version. I
LOAD
= 200 mA.
Symbol
Parameter
Conditions
Typ
LM1575-XX
Limit
(Note 2)
DEVICE PARAMETERS
I
b
f
O
Feedback Bias Current
Oscillator Frequency
V
OUT
= 5V (Adjustable Version Only)
(Note 13)
50
52
47/43
58/62
V
SAT
DC
I
CL
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
I
OUT
= 1A (Note 5)
(Note 6)
Peak Current (Notes 5, 13)
0.9
1.2/1.4
98
93
2.2
1.7/1.3
3.0/3.2
I
L
Output Leakage
Current
I
Q
I
STBY
Quiescent Current
Standby Quiescent
Current
(Note 7)
ON /OFF Pin = 5V (OFF)
(Notes 7, 8)
Output = 0V
Output = −1V
Output = −1V
5
10/12
50
200/500
5
Units
LM2575HV-XX (Limits)
Limit
(Note 3)
100/500
47/42
58/63
1.2/1.4
93
1.7/1.3
3.0/3.2
2
30
10
200
nA
kHz
kHz(Min)
kHz(Max)
V
V(Max)
%
%(Min)
A
A(Min)
A(Max)
mA(Max)
mA
mA(Max)
mA
mA(Max)
µA
µA(Max)
LM2575-XX
100/500
2
7.5
30
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2018 NOV
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