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

Parameters Values

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 150 kHz

Frequency Max 150 kHz

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 150 kHz

Regulator Family SIMPLE SWITCHER

Synchronous Rectification No

Typical Performance

*click for larger image

WEBENCH Live Simulation!

LM2595
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

Application Notes

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	Download
LM2595 SIMPLE SWITCHER Power Converter 150 kHz -1A StepDown Voltage Regulator (Japanese)	432 Kbytes

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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

NOPB
STD

1
1

NA
NA

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595T
-12 P+

8 weeks

1000

LM2595T-3.3

5

NOPB

1

NA

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595T
-3.3 P+

6 weeks

500

LM2595T-5.0

5

NOPB
STD

1
1

NA
NA

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595T
-5.0 P+

6 weeks

500

LM2595T-ADJ

5

NOPB
STD

1
1

NA
NA

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595T
-ADJ P+

8 weeks

500

LM2595S-12

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595S
-12 P+

8 weeks

500

LM2595S-3.3

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595S
-3.3 P+

8 weeks

500

LM2595S-5.0

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595S
-5.0 P+

12 weeks

1000

LM2595S-ADJ

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

500+

$1.81

rail
of
45

NSUZXYTTE#
LM2595S
-ADJ P+

6 weeks

500

LM2595SX-12

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

500+

$1.81

reel
of
500

NSUZXYTTE#
LM2595S
-12 P+

8 weeks

1000

LM2595SX-3.3

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

500+

$1.81

reel
of
500

NSUZXYTTE#
LM2595S
-3.3 P+

6 weeks

2000

LM2595SX-5.0

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

500+

$1.81

reel
of
500

NSUZXYTTE#
LM2595S
-5.0 P+

6 weeks

15000

LM2595SX-ADJ

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

500+

$1.81

reel
of
500

NSUZXYTTE#
LM2595S
-ADJ P+

6 weeks

5000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2595J-12-QML	NONE	NONE	04 Sep 2001
LM2595J-3.3-QML	NONE	NONE	04 Sep 2001
LM2595J-ADJ-QML	NONE	NONE	04 Sep 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	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2595S-12	LB300	0	33664	0	0	3830500	1	1086914834
LM2595S-3.3	LB300	0	33664	0	0	3830500	1	1086914834
LM2595S-5.0	LB300	0	33664	0	0	3830500	1	1086914834
LM2595S-ADJ	LB300	0	33664	0	0	3830500	1	1086914834
LM2595SX-12	LB300	0	33664	0	0	3830500	1	1086914834
LM2595SX-3.3	LB300	0	33664	0	0	3830500	1	1086914834
LM2595SX-5.0	LB300	0	33664	0	0	3830500	1	1086914834
LM2595SX-ADJ	LB300	0	33664	0	0	3830500	1	1086914834
LM2595T-12	LB300	0	33664	0	0	3830500	1	1086914834
LM2595T-3.3	LB300	0	33664	0	0	3830500	1	1086914834
LM2595T-5.0	LB300	0	33664	0	0	3830500	1	1086914834
LM2595T-ADJ	LB300	0	33664	0	0	3830500	1	1086914834

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

Design Tools

Title	Size in Kbytes	Date
SimpleSwitcher® DC-DC Converters Design Software			View

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Application Notes

Title	Size in Kbytes	Date
AN-1118: AN-1118 Simple Regulator Provides ±12V from 5V Source	51 Kbytes	4-Oct-04	Download
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment	162 Kbytes	1-Oct-02	Download
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment	215 Kbytes

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More Application Notes

Title	Size in Kbytes	Date
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-May-04	Download
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	4-Oct-04	Download
AN-1082 (Japanese): Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	85 Kbytes
AN-1081: Application Note 1081 A Low Cost, Low Parts-Count DC/DC Converter With Multiple Outputs	74 Kbytes	4-Oct-04	Download
AN-1253: Application Note 1253 Wide-Input, High Voltage Buck Converter	144 Kbytes	25-Sep-02	Download
AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs	370 Kbytes	7-Feb-07	Download
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	10-May-04	Download
AN-1797: Application Note 1797 TO-263 THIN Package	2716 Kbytes	10-Mar-08	Download
AN-1797 (Japanese): Application Note 1797 TO-263 THIN Package	1424 Kbytes

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[Information as of 8-Nov-2009]