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LM2596 Product Folder

SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator

See Also:		LM2676 - Higher switching frequency, smaller package
		LM2673 - Higher switching freq. w/ soft start and prog. current limit
		LM2670 - Higher switching freq. w/ freq. synchronization and enable pin
		LM2599 - LM2596 w/ error flag, soft start and shutdown pin
		LM2678 - Higher current (5A) and higher switching freq.
		LM2650 - 3A synchronous step-down regulator

Generic P/N 2596

General
Description

Package
& Models

Samples
& Pricing

Reliability
Metrics

Application
Notes

WEBENCH Live Simulation!

LM2596 Webench™ Custom Design/Analyze/Build It
4.5 <=	V in Lower V	<=	V in Upper V	<= 40.0
V out	1.2 <=		V	<= 40.0
I out			A	<= 3.00
Ambient Temperature			°C	<= 100
What is Webench?

Parametric Table

Temperature Min (deg C)	-40
Temperature Max (deg C)	125
Multiple Output Capability	No
On/Off Pin	Yes
Error Flag	No
InputMin Voltage (Volt)	15, 4.75, 7, 4.50
InputMax Voltage (Volt)	40
Output Current (mA)	3000
Output Voltage (Volt)	12, 3.30, 5
Adjustable Output	No, Yes
Output Range	1.2V-37V
Switching Frequency (Hz)	150000
Adj Switch Frequency	No
Sync Pin	No
Efficiency (%)	90, 73, 80
Flyback	No
Inverting	Yes
Step-Up	No
Step-Down	Yes
RegType	Switching Regulator

-

Datasheet

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
LM2596 SIMPLE SWITCHER Power Converter 150 kHz3A Step-Down Voltage Regulator	736 Kbytes	8-May-02	View Online	Download	Receive via Email
LM2596 SIMPLE SWITCHER Power Converter 150 kHz3A Step-Down Voltage Regulator (JAPANESE)	473 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking

Type

Pins

MSL/Lead-Free Availability

Lead
Time

Qty

SPICE

IBIS

Qty

$US each

LM2596T-12

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596T
-12 P+

9-11 weeks

25000

LM2596T-3.3

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596T
-3.3 P+

9-11 weeks

25000

LM2596T-5.0

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596T
-5.0 P+

9-11 weeks

25000

LM2596T-ADJ

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596T
-ADJ P+

9-11 weeks

25000

LM2596S-12

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596S
-12 P+

13-15 weeks

25000

LM2596S-3.3

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596S
-3.3 P+

13-15 weeks

25000

LM2596S-5.0

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596S
-5.0 P+

13-15 weeks

50000

LM2596S-ADJ

5

Full production

N/A

N/A

1K+

$1.81

rail
of
45

NSUZXYTT
LM2596S
-ADJ P+

13-15 weeks

25000

LM2596SX-12

5

Full production

N/A

N/A

1K+

$1.81

reel
of
500

NSUZXYTT
LM2596S
-12 P+

13-15 weeks

25000

LM2596SX-3.3

5

Full production

N/A

N/A

1K+

$1.81

reel
of
500

NSUZXYTT
LM2596S
-3.3 P+

13-15 weeks

50000

LM2596SX-5.0

5

Full production

N/A

N/A

1K+

$1.81

reel
of
500

NSUZXYTT
LM2596S
-5.0 P+

13-15 weeks

25000

LM2596SX-ADJ

5

Full production

N/A

N/A

1K+

$1.81

reel
of
500

NSUZXYTT
LM2596S
-ADJ P+

13-15 weeks

50000

LM2596-12 MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM2596-3.3 MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM2596-5.0 MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM2596-ADJ MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM2596-12 MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

LM2596-3.3 MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

LM2596-5.0 MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

LM2596-ADJ MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

General 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 guaranteed ±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.

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
Guaranteed 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

Applications

Simple high-efficiency step-down (buck) regulator
On-card switching regulators
Positive to negative converter

Reliability Metrics

Part Number	Process	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Rel. Rejects	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM2596-12 MDC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-12 MWC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-3.3 MDC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-3.3 MWC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-5.0 MDC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-5.0 MWC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-ADJ MDC	LB300	0	17700	0	0	1100000	4	311012542
LM2596-ADJ MWC	LB300	0	17700	0	0	1100000	4	311012542
LM2596S-12	LB300	0	17700	0	0	1100000	4	311012542
LM2596S-3.3	LB300	0	17700	0	0	1100000	4	311012542
LM2596S-5.0	LB300	0	17700	0	0	1100000	4	311012542
LM2596S-ADJ	LB300	0	17700	0	0	1100000	4	311012542
LM2596SX-12	LB300	0	17700	0	0	1100000	4	311012542
LM2596SX-3.3	LB300	0	17700	0	0	1100000	4	311012542
LM2596SX-5.0	LB300	0	17700	0	0	1100000	4	311012542
LM2596SX-ADJ	LB300	0	17700	0	0	1100000	4	311012542
LM2596T-12	LB300	0	17700	0	0	1100000	4	311012542
LM2596T-3.3	LB300	0	17700	0	0	1100000	4	311012542
LM2596T-5.0	LB300	0	17700	0	0	1100000	4	311012542
LM2596T-ADJ	LB300	0	17700	0	0	1100000	4	311012542

For more information on Reliablitity Metrics, please click here.

Design Tools

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
SimpleSwitcher® DC-DC Converters Design Software	9 Kbytes	28-Jul-2003	View

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Application Notes

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment	188 Kbytes	1-Oct-02	View Online	Download	Receive via Email
AN-1081: Application Note 1081 A Low Cost, Low Parts-Count DC/DC Converter with Multiple Outputs	74 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	50 Kbytes	18-Sep-02	View Online	Download	Receive via Email
AN-1118: Application Note 1118 Simple Regulator Provides ±12V from 5V Source	51 Kbytes	30-Sep-02	View Online	Download	Receive via Email
AN-1149: Application Note 1149 Layout Guidelines for Switching Power Supplies	113 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-1197: Application Note 1197 Selecting Inductors for Buck Converters	371 Kbytes	1-Oct-02	View Online	Download	Receive via Email
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-Oct-02	View Online	Download	Receive via Email
AN-1246: Application Note 1246 Stresses in Wide Input DC-DC Converters	272 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-556: Application Note 556 Introduction to Power Supplies	159 Kbytes	25-Sep-02	View Online	Download	Receive via Email

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[Information as of 15-Jan-2004]