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June 1996
LM1575 LM1575HV LM2575 LM2575HV Series
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 fre-
quency 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 g4% tolerance on out-
put voltage within specified input voltages and output load
conditions and g10% on the oscillator frequency External
shutdown is included featuring 50 mA (typical) standby cur-
rent The output switch includes cycle-by-cycle current limit-
ing as well as thermal shutdown for full protection under
fault conditions
Features
Y 3 3V 5V 12V 15V and adjustable output versions
Y Adjustable version output voltage range
1 23V to 37V (57V for HV version) g4% max over
line and load conditions
Y Guaranteed 1A output current
Y Wide input voltage range 40V up to 60V
for HV version
Y Requires only 4 external components
Y 52 kHz fixed frequency internal oscillator
Y TTL shutdown capability low power standby mode
Y High efficiency
Y Uses readily available standard inductors
Y Thermal shutdown and current limit protection
Y Pa Product Enhancement tested
Applications
Y Simple high-efficiency step-down (buck) regulator
Y Efficient pre-regualtor for linear regulators
Y On-card switching regulators
Y Positive to negative converter (Buck-Boost)
Typical Application (Fixed Output Voltage Versions)
Note Pin numbers are for the TO-220 package
Block Diagram and Typical Application
TL H 11475 – 1
3 3V R2 e 1 7k
5V R2 e 3 1k
12V R2 e 8 84k
15V R2 e 11 3k
For ADJ Version
R1 e Open R2 e 0X
Note Pin numbers are for
the TO-220 package
Patent Pending
FIGURE 1
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL H 11475
RRD-B30M76 Printed in U S A
TL H 11475 – 2
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Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Maximum Supply Voltage
LM1575 LM2575
LM1575HV LM2575HV
45V
63V
ON OFF Pin Input Voltage
Output Voltage to Ground
(Steady State)
b0 3V s V s aVIN
b1V
Power Dissipation
Internally Limited
Storage Temperature Range
b65 C to a150 C
Minimum ESD Rating
(C e 100 pF R e 1 5 kX)
Lead Temperature
(Soldering 10 sec )
Maximum Junction Temperature
2 kV
260 C
150 C
Operating Ratings
Temperature Range
LM1575 LM1575HV
LM2575 LM2575HV
Supply Voltage
LM1575 LM2575
LM1575HV LM2575HV
b55 C s TJ s a150 C
b40 C s TJ s a125 C
40V
60V
LM1575-3 3 LM1575HV-3 3 LM2575-3 3 LM2575HV-3 3
Electrical Characteristics Specifications with standard type face are for TJ e 25 C and those with boldface
type apply over full Operating Temperature Range
Symbol
Parameter
Conditions
LM1575-3 3
LM2575-3 3
Typ
LM1575HV-3 3
Limit
LM2575HV-3 3
Limit
Units
(Limits)
(Note 2)
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT Output Voltage
VIN e 12V ILOAD e 0 2A
Circuit of Figure 2
33
3 267
3 333
3 234
3 366
V
V(Min)
V(Max)
VOUT
Output Voltage
LM1575 LM2575
4 75V s VIN s 40V 0 2A s ILOAD s 1A 3 3
Circuit of Figure 2
3 200 3 168
3 400 3 432
3 168 3 135
3 432 3 465
V
V(Min)
V(Max)
VOUT
Output Voltage
4 75V s VIN s 60V 0 2A s ILOAD s 1A 3 3
LM1575HV LM2575HV Circuit of Figure 2
3 200 3 168
3 416 3 450
3 168 3 135
3 450 3 482
V
V(Min)
V(Max)
h Efficiency
VIN e 12V ILOAD e 1A
75
%
LM1575-5 0 LM1575HV-5 0 LM2575-5 0 LM2575HV-5 0
Electrical Characteristics Specifications with standard type face are for TJ e 25 C and those with boldface
type apply over full Operating Temperature Range
Symbol
Parameter
Conditions
LM1575-5 0
LM2575-5 0
Typ
LM1575HV-5 0
Limit
LM2575HV-5 0
Limit
Units
(Limits)
(Note 2)
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT
Output Voltage
VIN e 12V ILOAD e 0 2A
Circuit of Figure 2
50
4 950
5 050
4 900
5 100
V
V(Min)
V(Max)
VOUT
Output Voltage
LM1575 LM2575
0 2A s ILOAD s 1A
8V s VIN s 40V
Circuit of Figure 2
50 V
4 850 4 800
4 800 4 750
V(Min)
5 150 5 200
5 200 5 250
V(Max)
VOUT
Output Voltage
LM1575HV LM2575HV
0 2A s ILOAD s 1A
8V s VIN s 60V
Circuit of Figure 2
50 V
4 850 4 800
4 800 4 750
V(Min)
5 175 5 225
5 225 5 275
V(Max)
h Efficiency
VIN e 12V ILOAD e 1A
77
%
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LM1575-12 LM1575HV-12 LM2575-12 LM2575HV-12
Electrical Characteristics Specifications with standard type face are for TJ e 25 C and those with boldface
type apply over full Operating Temperature Range
Symbol
Parameter
Conditions
LM1575-12
LM2575-12
Typ
LM1575HV-12
Limit
LM2575HV-12
Limit
Units
(Limits)
(Note 2)
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT
Output Voltage
VIN e 25V ILOAD e 0 2A
Circuit of Figure 2
12
11 88
12 12
11 76
12 24
V
V(Min)
V(Max)
VOUT
Output Voltage
LM1575 LM2575
0 2A s ILOAD s 1A
15V s VIN s 40V
Circuit of Figure 2
12 V
11 64 11 52 11 52 11 40
V(Min)
12 36 12 48 12 48 12 60 V(Max)
VOUT
Output Voltage
LM1575HV LM2575HV
0 2A s ILOAD s 1A
15V s VIN s 60V
Circuit of Figure 2
12 V
11 64 11 52 11 52 11 40
V(Min)
12 42 12 54 12 54 12 66 V(Max)
h Efficiency
VIN e 15V ILOAD e 1A
88
%
LM1575-15 LM1575HV-15 LM2575-15 LM2575HV-15
Electrical Characteristics Specifications with standard type face are for TJ e 25 C and those with boldface
type apply over full Operating Temperature Range
Symbol
Parameter
Conditions
LM1575-15
LM2575-15
Typ
LM1575HV-15
Limit
LM2575HV-15
Limit
Units
(Limits)
(Note 2)
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT
Output Voltage
VIN e 30V ILOAD e 0 2A
Circuit of Figure 2
15
14 85
15 15
14 70
15 30
V
V(Min)
V(Max)
VOUT
Output Voltage
LM1575 LM2575
0 2A s ILOAD s 1A
18V s VIN s 40V
Circuit of Figure 2
15 V
14 55 14 40
14 40 14 25 V(Min)
15 45 15 60
15 60 15 75 V(Max)
VOUT
Output Voltage
LM1575HV LM2575HV
0 2A s ILOAD s 1A
18V s VIN s 60V
Circuit of Figure 2
15 V
14 55 14 40
14 40 14 25 V(Min)
15 525 15 675 15 68 15 83 V(Max)
h Efficiency
VIN e 18V ILOAD e 1A
88
%
LM1575-ADJ LM1575HV-ADJ LM2575-ADJ LM2575HV-ADJ
Electrical Characteristics
Specifications with standard type face are for TJ e 25 C and those with boldface type apply over full Operating Tem-
perature Range
Symbol
Parameter
Conditions
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT Feedback Voltage
VIN e 12V ILOAD e 0 2A
VOUT e 5V
Circuit of Figure 2
VOUT
VOUT
h
Feedback Voltage
LM1575 LM2575
Feedback Voltage
LM1575HV LM2575HV
Efficiency
0 2A s ILOAD s 1A
8V s VIN s 40V
VOUT e 5V Circuit of Figure 2
0 2A s ILOAD s 1A
8V s VIN s 60V
VOUT e 5V Circuit of Figure 2
VIN e 12V ILOAD e 1A VOUT e 5V
Typ
1 230
1 230
1 230
77
LM1575-ADJ
LM1575HV-ADJ
Limit
(Note 2)
1 217
1 243
1 205 1 193
1 255 1 267
1 205 1 193
1 261 1 273
LM2575-ADJ
LM2575HV-ADJ
Limit
(Note 3)
1 217
1 243
1 193 1 180
1 267 1 280
1 193 1 180
1 273 1 286
Units
(Limits)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
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All Output Voltage Versions
Electrical Characteristics Specifications with standard type face are for TJ e 25 C and those with boldface
type apply over full Operating Temperature Range Unless otherwise specified VIN e 12V for the 3 3V 5V and
Adjustable version VIN e 25V for the 12V version and VIN e 30V for the 15V version ILOAD e 200 mA
Symbol
Parameter
Conditions
LM1575-XX LM2575-XX
LM1575HV-XX LM2575HV-XX
Typ
Limit
Limit
(Note 2)
(Note 3)
Units
(Limits)
DEVICE PARAMETERS
Ib
Feedback Bias Current VOUT e 5V (Adjustable Version Only)
50 100 500
100 500
nA
fO Oscillator Frequency (Note 13)
52
47 43
58 62
47 42
58 63
kHz
kHz(Min)
kHz(Max)
VSAT Saturation Voltage
IOUT e 1A (Note 5)
09
12 14
12 14
V
V(Max)
DC Max Duty Cycle (ON) (Note 6)
98
93
%
93 %(Min)
ICL Current Limit
Peak Current (Notes 5 and 13)
22
17 13
30 32
17 13
30 32
A
A(Min)
A(Max)
IL Output Leakage Current (Notes 7 and 8)
Output e 0V
Output e b1V 7 5
Output e b1V
2
30
2 mA(Max)
mA
30 mA(Max)
IQ Quiescent Current (Note 7)
5
10 12
mA
10 mA(Max)
ISTBY
Standby Quiescent
Current
ON OFF Pin e 5V (OFF)
50
200 500
mA
200 mA(Max)
iJA
Thermal Resistance
K Package Junction to Ambient
iJC K Package Junction to Case
iJA T Package Junction to Ambient (Note 9)
iJA T Package Junction to Ambient (Note 10)
iJC T Package Junction to Case
iJA N Package Junction to Ambient (Note 11)
iJA M Package Junction to Ambient (Note 11)
iJA S Package Junction to Ambient (Note 12)
ON OFF CONTROL Test Circuit Figure 2
35
15
65
45
2
85
100
37
CW
VIH ON OFF Pin Logic
VIL Input Level
IIH ON OFF Pin Input
Current
VOUT e 0V
VOUT e Nominal Output Voltage
ON OFF Pin e 5V (OFF)
14 22 24
12 10 08
12
30
22 24
10 08
30
V(Min)
V(Max)
mA
mA(Max)
IIL
ON OFF Pin e 0V (ON)
0
mA
10 10 mA(Max)
Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur 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
Note 2 All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face) All limts are used to calculate Average
Outgoing Quality Leel and all are 100% production tested
Note 3 All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face) All room temperature limits are 100%
production tested All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods
Note 4 External components such as the catch diode inductor input and output capacitors can affect switching regulator system performance When the
LM1575 LM2575 is used as shown in the Figure 2 test circuit system performance will be as shown in system parameters section of Electrical Characteristics
Note 5 Output (pin 2) sourcing current No diode inductor or capacitor connected to output pin
Note 6 Feedback (pin 4) removed from output and connected to 0V
Note 7 Feedback (pin 4) removed from output and connected to a12V for the Adjustable 3 3V and 5V versions and a25V for the 12V and 15V versions to
force the output transistor OFF
Note 8 VIN e 40V (60V for the high voltage version)
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Electrical Characteristics (Notes) (Continued)
Note 9 Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically with inch leads in a socket or on a PC
board with minimum copper area
Note 10 Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically with inch leads soldered to a PC
board containing approximately 4 square inches of copper area surrounding the leads
Note 11 Junction to ambient thermal resistance with approxmiately 1 square inch of pc board copper surrounding the leads Additional copper area will lower
thermal resistance further See thermal model in Switchers made Simple software
Note 12 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 iJA is 50 C W with 1 square inch of copper area iJA is 37 C W and with 1 6 or more square inches of copper area iJA is
32 C W
Note 13 The oscillator frequency reduces to approximately 18 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 self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle
from 5% down to approximately 2%
Note 14 Refer to RETS LM1575K LM1575HVK for current revision of military RETS SMD
Typical Performance Characteristics (Circuit ofFigure 2 )
Normalized Output Voltage
Line Regulation
Dropout Voltage
Current Limit
Quiescent Current
Standby
Quiescent Current
Oscillator Frequency
Switch Saturation
Voltage
Efficiency
TL H 11475 – 3
TL H 11475 – 31
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