LM2595 - SIMPLE SWITCHER Power Converter 150 KHz 1A Step-Down Voltage Regulator

	LM2595 - SIMPLE SWITCHER Power Converter 150 KHz 1A Step-Down Voltage Regulator

Datasheet	Packaging	Samples & Pricing	Reliability	Design Tools	Application Notes	Knowledge Base

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 (surface mount) packages
•	Guaranteed 1A 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 85 µA
•	High efficiency
•	Uses readily available standard inductors
•	Thermal shutdown and current limit protection

General Description

The LM2595 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. More...

Applications

•	Simple high-efficiency step-down (buck) regulator
•	Efficient pre-regulator for linear regulators
•	On-card switching regulators
•	Positive to negative converter

Typical Application

click for larger image

Parametric Table expand

Parametric Table collapse

Output Current 1000 mA

Input Min Voltage 4.5, 7, 4.75, 15 Volt

Input Max Voltage 40 Volt

Output Min 3.3, 1.23, 12, 5 Volt

Output Max 3.3, 37, 12, 5 Volt

Frequency Min 150000 Hz

Frequency Max 150000 Hz

Output Current 1000 mA

Input Min Voltage 4.5, 7, 4.75, 15 Volt

Input Max Voltage 40 Volt

Output Min 3.3, 1.23, 12, 5 Volt

Output Max 3.3, 37, 12, 5 Volt

Frequency Min 150000 Hz

Frequency Max 150000 Hz

Efficiency (peak) 90, 78, 82 %

On/Off Pin Yes

Error Flag No

SoftStart No

Sync Pin No

Inverting Yes

Flyback No

RegType Switching Regulator

Temperature Min -40 deg C

Temperature Max 125 deg C

Adjustable Output Yes, No

Adj Switch Frequency No

PWM Mode Voltage

Topology Buck

Special Features SIMPLE SWITCHER regulator

Step-Down Yes

Multiple Output Capability No

Output Power Undefined Watt

Output Voltage 3.3, Undefined, 12, 5 Volt

Output Range 5V, 12V, 1.23V to 37V, 3.3V

Switching Frequency 150000 Hz

Regulator Family SIMPLE SWITCHER

View Using Catalog

Typical Performance

*click for larger image

WEBENCH Live Simulation!

LM2595 WEBENCH® Custom Design/Analyze/Build It/Test It
4.50 <=	V in Lower V	<=	V in Upper V	<= 40.00
V out	1.23 <=		V	<= 40.00
I out			A	<= 1.00
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM2591HV	Input Voltage Up To 60V
LM2596	3A Version Of LM2595
LM2598	Has Error Flag And Error Output Delay
LM2651	1.5A Synchronous Rectification For Higher Efficiency
LM2675	Improved Switching Frequency (260 - 400 KHz)
LM2734	1A SOT-23, 3.0V - 20V Vin, 500Khz-3MHz FSW
LM5010	1A, 80V Vin, 50Khz-800KHz FSW
LM2825	1A Totally Integrated Switching Power Supply IC

Additional Resources

Design Tools (see below)

Application Notes (see below)

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM2595 SIMPLE SWITCHER Power Converter 150 kHz -1A StepDown Voltage Regulator	935 Kbytes	29-Jun-99	View Online	Download	Receive via Email
LM2595 SIMPLE SWITCHER Power Converter 150 kHz -1A StepDown Voltage Regulator (Japanese)	432 Kbytes

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

Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM2595T-12

5

STD

NOPB

1

1

NA

NA

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595T
-12 P+

8 weeks

500

LM2595T-3.3

5

NOPB

1

NA

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595T
-3.3 P+

6 weeks

500

LM2595T-5.0

5

STD

NOPB

1

1

NA

NA

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595T
-5.0 P+

6 weeks

1000

LM2595T-ADJ

5

STD

NOPB

1

1

NA

NA

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595T
-ADJ P+

6 weeks

1000

LM2595S-12

5

STD

NOPB

3

3

235

245

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595S
-12 P+

8 weeks

500

LM2595S-3.3

5

STD

NOPB

3

3

235

245

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595S
-3.3 P+

6 weeks

500

LM2595S-5.0

5

STD

NOPB

3

3

235

245

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595S
-5.0 P+

6 weeks

1000

LM2595S-ADJ

5

STD

NOPB

3

3

235

245

Full production

N/A

Samples

1K+

$1.62

rail
of
45

NSUZXYTTE#
LM2595S
-ADJ P+

6 weeks

1000

LM2595SX-12

5

STD

NOPB

3

3

235

245

Full production

N/A

1K+

$1.62

reel
of
500

NSUZXYTTE#
LM2595S
-12 P+

6 weeks

1000

LM2595SX-3.3

5

STD

NOPB

3

3

235

245

Full production

N/A

1K+

$1.62

reel
of
500

NSUZXYTTE#
LM2595S
-3.3 P+

6 weeks

1000

LM2595SX-5.0

5

STD

NOPB

3

3

235

245

Full production

N/A

1K+

$1.62

reel
of
500

NSUZXYTTE#
LM2595S
-5.0 P+

6 weeks

1000

LM2595SX-ADJ

5

STD

NOPB

3

3

235

245

Full production

N/A

1K+

$1.62

reel
of
500

NSUZXYTTE#
LM2595S
-ADJ P+

6 weeks

10000

Obsolete Parts

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2595J-12-QML	LM1575J-12-QML	NATIONAL SEMICONDUCTOR	09/04/2001
LM2595J-3.3-QML	LM1575J-ADJ-QML	NATIONAL SEMICONDUCTOR	09/04/2001
LM2595J-ADJ-QML	LM1575J-ADJ-QML	NATIONAL SEMICONDUCTOR	09/04/2001

General Description

The LM2595 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 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 LM2595 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. Typically, for output voltages less than 12V, and ambient temperatures less than 50°C, no heat sink is required.

A standard series of inductors are available from several different manufacturers optimized for use with the LM2595 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 85 µA stand-by 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.

Reliability Metrics

Part Number	Process	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Rel. Rejects	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM2595S-12	LB300	0	27364	0	0	2474500	2	702146131
LM2595S-3.3	LB300	0	27364	0	0	2474500	2	702146131
LM2595S-5.0	LB300	0	27364	0	0	2474500	2	702146131
LM2595S-ADJ	LB300	0	27364	0	0	2474500	2	702146131
LM2595SX-12	LB300	0	27364	0	0	2474500	2	702146131
LM2595SX-3.3	LB300	0	27364	0	0	2474500	2	702146131
LM2595SX-5.0	LB300	0	27364	0	0	2474500	2	702146131
LM2595SX-ADJ	LB300	0	27364	0	0	2474500	2	702146131
LM2595T-12	LB300	0	27364	0	0	2474500	2	702146131
LM2595T-3.3	LB300	0	27364	0	0	2474500	2	702146131
LM2595T-5.0	LB300	0	27364	0	0	2474500	2	702146131
LM2595T-ADJ	LB300	0	27364	0	0	2474500	2	702146131

For more information on Reliability Metrics, please click here.

Design Tools

Title	Size in Kbytes	Date
SimpleSwitcher® DC-DC Converters Design Software	12 Kbytes	11-Jan-2008	View

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Application Notes

Title	Size in Kbytes	Date
AN-1118: Application Note 1118 Simple Regulator Provides ±12V from 5V Source	51 Kbytes	30-Sep-02	View Online	Download	Receive via Email
AN-1253: Application Note 1253 Wide-Input, High Voltage Buck Converter	144 Kbytes	25-Sep-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-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	304 Kbytes
AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	668 Kbytes
AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	50 Kbytes	18-Sep-02	View Online	Download	Receive via Email
AN-1082 (Japanese): Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	85 Kbytes
AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs	370 Kbytes	7-Feb-07	View Online	Download	Receive via Email
AN-1566 (Japanese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs	442 Kbytes
AN-1566 (Chinese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs	282 Kbytes
AN-1207: Application Note 1207 LM2593HV Evaluation Board	219 Kbytes	25-Sep-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-1061: Application Note 1061 Power Conversion in Line-Powered Equipment	188 Kbytes	1-Oct-02	View Online	Download	Receive via Email
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment	215 Kbytes
AN-1797: Application Note 1797 TO-263 THIN Package	2716 Kbytes	10-Mar-08	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-1197 (Japanese): Application Note 1197 Selecting Inductors for Buck Converters	304 Kbytes
AN-1197 (Chinese): Application Note 1197 Selecting Inductors for Buck Converters	515 Kbytes

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[Information as of 8-Aug-2008]