LM2596
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SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
LM2596 SIMPLE SWITCHER
®
Power Converter 150 kHz
3A Step-Down Voltage Regulator
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LM2596
1
FEATURES
3.3V, 5V, 12V, and Adjustable Output Versions
Adjustable Version Output Voltage Range,
1.2V to 37V ±4% Max Over Line and Load
Conditions
Available in TO-220 and TO-263 Packages
Ensured 3A Output Load Current
Input Voltage Range Up to 40V
Requires Only 4 External Components
Excellent Line and Load Regulation
Specifications
150 kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability
Low Power Standby Mode, I
Q
Typically 80
μA
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit
Protection
DESCRIPTION
The LM2596 series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
driving a 3A load with excellent line and load
regulation. These devices are available in fixed output
voltages of 3.3V, 5V, 12V, 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 LM2596 series operates at a switching frequency
of 150 kHz thus allowing smaller sized filter
components than what would be needed with lower
frequency switching regulators. Available in a
standard 5-lead TO-220 package with several
different lead bend options, and a 5-lead TO-263
surface mount package.
A standard series of inductors are available from
several different manufacturers optimized for use with
the LM2596 series. This feature greatly simplifies the
design of switch-mode power supplies.
Other features include a ensured ±4% tolerance on
output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
frequency. External shutdown is included, featuring
typically 80
μA
standby current. Self protection
features include a two stage frequency reducing
current limit for the output switch and an over
temperature shutdown for complete protection under
fault conditions.
(1)
(1)
† Patent Number 5,382,918.
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APPLICATIONS
•
•
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Simple High-Efficiency Step-Down (Buck)
Regulator
On-Card Switching Regulators
Positive to Negative Converter
Typical Application
(Fixed Output Voltage Versions)
1
2
3
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SIMPLE SWITCHER is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
Copyright © 1999–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LM2596
SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
www.ti.com
Connection Diagrams
Figure 1. 5-Lead Bent and Staggered Leads,
Through Hole TO-220 (T) Package
See Package Number NDH0005D
Figure 2. 5-Lead DDPAK/TO-263 (S) Package
See Package Number KTT0005B
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
Maximum Supply Voltage
ON /OFF Pin Input Voltage
Feedback Pin Voltage
(1) (2)
45V
−0.3 ≤
V
≤
+25V
−0.3 ≤
V
≤+25V
−1V
Internally limited
−65°C
to +150°C
2 kV
Output Voltage to Ground (Steady State)
Power Dissipation
Storage Temperature Range
ESD Susceptibility
Human Body Model
Lead Temperature
DDPAK/TO-263 Package
Vapor Phase (60 sec.)
Infrared (10 sec.)
TO-220 Package (Soldering, 10 sec.)
Maximum Junction Temperature
(1)
(2)
(3)
(3)
+215°C
+245°C
+260°C
+150°C
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 ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Operating Conditions
Temperature Range
Supply Voltage
−40°C ≤
T
J
≤
+125°C
4.5V to 40V
2
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LM2596
Copyright © 1999–2013, Texas Instruments Incorporated
LM2596
www.ti.com
SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
LM2596-3.3 Electrical Characteristics
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range
LM2596-3.3
Symbol
Parameter
(3)
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
SYSTEM PARAMETERS
V
OUT
Test Circuit
Figure 20
4.75V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
3.3
3.168/3.135
3.432/3.465
V
V(min)
V(max)
%
Output Voltage
η
(1)
(2)
(3)
Efficiency
V
IN
= 12V, I
LOAD
= 3A
73
Typical numbers are at 25°C and represent the most likely norm.
All limits specified 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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2596 is used as shown in the
Figure 20
test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
LM2596-5.0 Electrical Characteristics
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range
LM2596-5.0
Symbol
Parameter
(3)
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
SYSTEM PARAMETERS
V
OUT
Test Circuit
Figure 20
7V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
5.0
4.800/4.750
5.200/5.250
V
V(min)
V(max)
%
Output Voltage
η
(1)
(2)
(3)
Efficiency
V
IN
= 12V, I
LOAD
= 3A
80
Typical numbers are at 25°C and represent the most likely norm.
All limits specified 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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2596 is used as shown in the
Figure 20
test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
LM2596-12 Electrical Characteristics
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range
LM2596-12
Symbol
Parameter
(3)
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
SYSTEM PARAMETERS
V
OUT
Test Circuit
Figure 20
15V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
12.0
11.52/11.40
12.48/12.60
V
V(min)
V(max)
%
Output Voltage
η
(1)
(2)
(3)
Efficiency
V
IN
= 25V, I
LOAD
= 3A
90
Typical numbers are at 25°C and represent the most likely norm.
All limits specified 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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2596 is used as shown in the
Figure 20
test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
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3
Copyright © 1999–2013, Texas Instruments Incorporated
LM2596
SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
www.ti.com
LM2596-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
LM2596-ADJ
Symbol
Parameter
(3)
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
SYSTEM PARAMETERS
V
FB
Test Circuit
Figure 20
4.5V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
V
OUT
programmed for 3V. Circuit of
Figure 20
1.230
1.193/1.180
1.267/1.280
73
V
V(min)
V(max)
%
Feedback Voltage
η
(1)
(2)
(3)
Efficiency
V
IN
= 12V, V
OUT
= 3V, I
LOAD
= 3A
Typical numbers are at 25°C and represent the most likely norm.
All limits specified 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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2596 is used as shown in the
Figure 20
test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
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
Temperature Range.
Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the
12V version. I
LOAD
= 500 mA
LM2596-XX
Symbol
Parameter
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
DEVICE PARAMETERS
I
b
f
O
Feedback Bias Current
Oscillator Frequency
Adjustable Version Only, V
FB
= 1.3V
See
(3)
10
50/100
150
127/110
173/173
nA
nA (max)
kHz
kHz(min)
kHz(max)
V
1.4/1.5
V(max)
%
A
3.6/3.4
6.9/7.5
A(min)
A(max)
μA(max)
mA
30
mA(max)
mA
10
mA(max)
V
SAT
DC
I
CL
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Current Limit
I
OUT
= 3A
See
See
(5)
(6)
(4) (5)
1.16
100
0
Peak Current
(4) (5)
4.5
I
L
Output Leakage Current
Output = 0V
(4) (6)
(7)
50
2
5
Output =
−1V
I
Q
Quiescent Current
See
(6)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
4
Typical numbers are at 25°C and represent the most likely norm.
All limits specified 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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
The switching frequency is reduced when the second stage current limit is activated.
No diode, inductor or capacitor connected to output pin.
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force
the output transistor switch OFF.
V
IN
= 40V.
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Copyright © 1999–2013, Texas Instruments Incorporated
LM2596
www.ti.com
SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
All Output Voltage Versions Electrical Characteristics (continued)
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range.
Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the
12V version. I
LOAD
= 500 mA
LM2596-XX
Symbol
I
STBY
θ
JC
θ
JA
θ
JA
θ
JA
θ
JA
ON/OFF CONTROL
Test Circuit
Figure 20
ON /OFF Pin Logic Input
V
IH
V
IL
I
H
I
L
ON /OFF Pin Input Current
Threshold Voltage
Low (Regulator ON)
High (Regulator OFF)
V
LOGIC
= 2.5V (Regulator OFF)
V
LOGIC
= 0.5V (Regulator ON)
5
15
0.02
5
(8)
1.3
0.6
2.0
V
V(max)
V(min)
μA
μA(max)
μA
μA(max)
Parameter
Standby Quiescent Current
Thermal Resistance
Conditions
ON/OFF pin = 5V (OFF)
(7)
Typ
(1)
Limit
(2)
Units
(Limits)
μA
80
200/250
2
50
50
30
20
μA(max)
°C/W
°C/W
°C/W
°C/W
°C/W
TO-220 or TO-263 Package, Junction to Case
TO-220 Package, Junction to Ambient
TO-263 Package, Junction to Ambient
TO-263 Package, Junction to Ambient
TO-263 Package, Junction to Ambient
(8)
(9)
(10)
(11)
Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a
printed circuit board with (1 oz.) copper area of approximately 1 in
2
.
(9) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in
2
of (1 oz.)
copper area.
(10) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in
2
of (1
oz.) copper area.
(11) Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in
2
of (1 oz.)
copper area on the LM2596S side of the board, and approximately 16 in
2
of copper on the other side of the p-c board. See
Application
Information
in this data sheet and the thermal model in Switchers Made Simple™ version 4.3 software.
Copyright © 1999–2013, Texas Instruments Incorporated
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