LM2596S-12/NOPB National Semiconductor, LM2596S-12/NOPB Datasheet
LM2596S-12/NOPB
Specifications of LM2596S-12/NOPB
*LM2596S-12/NOPB
LM2596S-12
Available stocks
Related parts for LM2596S-12/NOPB
LM2596S-12/NOPB Summary of contents
Page 1
... Output Voltage Versions) SIMPLE SWITCHER ® and Switchers Made Simple ® are registered trademarks of National Semiconductor Corporation. © 2002 National Semiconductor Corporation Power Converter 150 kHz ® Features n 3.3V, 5V, 12V, and adjustable output versions n Adjustable version output voltage range, 1.2V to 37V ± ...
Page 2
... Connection Diagrams and Ordering Information Bent and Staggered Leads, Through Hole Package 5-Lead TO-220 (T) Order Number LM2596T-3.3, LM2596T-5.0, LM2596T-12 or LM2596T-ADJ See NS Package Number T05D www.national.com Surface Mount Package 5-Lead TO-263 (S) 01258302 Order Number LM2596S-3.3, LM2596S-5.0, LM2596S-12 or LM2596S-ADJ See NS Package Number TS5B 2 01258303 ...
Page 3
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Supply Voltage ON /OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range ESD Susceptibility LM2596-3 ...
Page 4
LM2596-ADJ Electrical Characteristics Specifications with standard type face are for T ture Range Symbol Parameter SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 V Feedback Voltage 4. OUT Efficiency V IN All Output Voltage Versions Electrical Characteristics Specifications ...
Page 5
... Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in the LM2596S side of the board, and approximately 16 in model in Switchers Made Simple ™ ...
Page 6
Typical Performance Characteristics Switch Saturation Voltage 01258307 Operating Quiescent Current 01258310 ON /OFF Threshold Voltage 01258313 www.national.com (Circuit of Figure 1 ) (Continued) Switch Current Limit 01258308 Shutdown Quiescent Current 01258311 ON /OFF Pin Current (Sinking) 01258314 6 Dropout Voltage ...
Page 7
Typical Performance Characteristics Feedback Pin Bias Current 01258316 (Circuit of Figure 1 ) (Continued) 7 www.national.com ...
Page 8
Typical Performance Characteristics Continuous Mode Switching Waveforms V = 20V 5V OUT µ 220 µF, C OUT Horizontal Time Base: 2 µs/div. A: Output Pin Voltage, 10V/div. B: Inductor Current 1A/div. ...
Page 9
Test Circuit and Layout Guidelines where V = 1.23V REF Select approximately use a 1% resistor for best stability — 470 µF, 50V, Aluminum Electrolytic Nichicon “PL Series” — 220 ...
Page 10
LM2596 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) Given Regulated Output Voltage (3.3V 12V) OUT V (max) = Maximum DC Input Voltage IN I (max) = Maximum Load Current LOAD 1. ...
Page 11
LM2596 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) 3. Catch Diode Selection (D1) A. The catch diode current rating must be at least 1.3 times greater than the maximum load current. Also, if the power ...
Page 12
LM2596 Series Buck Regulator Design Procedure (Fixed Output) Conditions Output Load Max Input Voltage Current Voltage (V) (A) (V) 3 ...
Page 13
LM2596 Series Buck Regulator Design Procedure (Adjustable Output) PROCEDURE (Adjustable Output Voltage Version) Given Regulated Output Voltage OUT V (max) = Maximum Input Voltage IN I (max) = Maximum Load Current LOAD F = Switching Frequency (Fixed at ...
Page 14
LM2596 Series Buck Regulator Design Procedure (Adjustable Output) (Continued) PROCEDURE (Adjustable Output Voltage Version) 3. Output Capacitor Selection (C OUT A. In the majority of applications, low ESR electrolytic or solid tantalum capacitors between 82 µF and 820 µF provide ...
Page 15
LM2596 Series Buck Regulator Design Procedure (Adjustable Output) (Continued) PROCEDURE (Adjustable Output Voltage Version) 5. Catch Diode Selection (D1) A. The catch diode current rating must be at least 1.3 times greater than the maximum load current. Also, if the ...
Page 16
LM2596 Series Buck Regulator Design Procedure (Adjustable Output) Output Through Hole Output Capacitor Voltage Panasonic Nichicon PL (V) HFQ Series (µF/V) 2 820/35 4 560/35 6 470/25 9 330/ 330/ 220/ 220/ ...
Page 17
LM2596 Series Buck Regulator Design Procedure Inductance Current Schott (µH) (A) Through Hole L15 22 0.99 67148350 67148460 RL-1284-22-43 RL1500-22 L21 68 0.99 67144070 67144450 RL-5471-5 L22 47 1.17 67144080 67144460 RL-5471-6 L23 33 1.40 67144090 67144470 RL-5471-7 L24 22 ...
Page 18
LM2596 Series Buck Regulator Design Procedure Nichicon Corp. Panasonic AVX Corp. Sprague/Vishay FIGURE 10. Capacitor Manufacturers Phone Numbers VR 3A Diodes Surface Mount Schottky Ultra Fast Recovery 20V All of these SK32 diodes are 30V 30WQ03 rated to SK33 at ...
Page 19
Block Diagram Application Information PIN FUNCTIONS +V — This is the positive input supply for the IC switching IN regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching ...
Page 20
Application Information A graph shown in Figure 13 shows the relationship between an electrolytic capacitor value, its voltage rating, and the RMS current it is rated for. These curves were obtained from the Nichicon “PL” series of low ESR, high ...
Page 21
Application Information good choice, but some types with an abrupt turnoff charac- teristic may cause instability or EMI problems. Ultra-fast recovery diodes typically have reverse recovery times less. Rectifiers such as the 1N5400 series are much ...
Page 22
Application Information DISCONTINUOUS MODE OPERATION The selection guide chooses inductor values suitable for continuous mode operation, but for low current applications and/or high input voltages, a discontinuous mode design may be a better choice. It would use an inductor that ...
Page 23
Application Information FIGURE 18. Peak-to-Peak Inductor Ripple Current vs Load Current In a switching regulator design, knowing the value of the peak-to-peak inductor ripple current ( I determining a number of other circuit parameters. Param- eters such as, peak inductor ...
Page 24
... PC board with large copper areas and/or airflow are recommended. The curves shown in Figure 20 show the LM2596S (TO-263 package) junction temperature rise above ambient tempera- ture with a 2A load for various input and output voltages. This ...
Page 25
Application Information FIGURE 21. Delayed Startup FIGURE 22. Undervoltage Lockout for Buck Regulator DELAYED STARTUP The circuit in Figure 21 uses the the ON /OFF pin to provide a time delay between the time the input voltage is applied and ...
Page 26
Application Information This circuit has hysteresis Regulator starts switching 13V IN Regulator stops switching FIGURE 24. Undervoltage Lockout with Hysteresis for Inverting Regulator C — 68 µF/25V Tant. Sprague 595D IN 470 ...
Page 27
Application Information INVERTING REGULATOR SHUTDOWN METHODS To use the ON /OFF pin in a standard buck configuration is simple, pull it below 1. 25˚C, referenced to ground) to turn regulator ON, pull it above 1.3V to shut the ...
Page 28
Application Information TYPICAL THROUGH HOLE PC BOARD LAYOUT, FIXED OUTPUT (1X SIZE), DOUBLE SIDED C — 470 µF, 50V, Aluminum Electrolytic Panasonic, “HFQ Series” — 330 µF, 35V, Aluminum Electrolytic Panasonic, “HFQ Series” OUT D1 — 5A, 40V ...
Page 29
Application Information TYPICAL THROUGH HOLE PC BOARD LAYOUT, ADJUSTABLE OUTPUT (1X SIZE), DOUBLE SIDED C — 470 µF, 50V, Aluminum Electrolytic Panasonic, “HFQ Series” — 220 µF, 35V Aluminum Electrolytic Panasonic, “HFQ Series” OUT D1 — 5A, 40V ...
Page 30
Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 5-Lead TO-220 (T) Order Number LM2596T-3.3, LM2596T-5.0, LM2596T-12 or LM2596T-ADJ NS Package Number T05D 30 ...
Page 31
... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) 5-Lead TO-263 Surface Mount Package (S) Order Number LM2596S-3.3, LM2596S-5.0, LM2596S-12 or LM2596S-ADJ NS Package Number TS5B 2 ...