LM22672 - 1A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features

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

Features

•	Wide input voltage range: 4.5V to 42V
•	Internally compensated voltage mode control
•	Stable with low ESR ceramic capacitors
•	200 mΩ N-channel MOSFET
•	Output voltage options:
•	-ADJ (outputs as low as 1.285V)
•	-5.0 (output fixed to 5V)
•	±1.5% feedback reference accuracy
•	Switching frequency of 500 kHz, adjustable between 200 kHz and 1 MHz
•	-40°C to 125°C operating junction temperature range
•	Precision enable pin
•	Integrated boot diode
•	Adjustable soft-start
•	Fully WEBENCH ® enabled
•	Step-down and inverting buck-boost applications

General Description

Applications

•	Industrial Control
•	Telecom and Datacom Systems
•	Embedded Systems
•	Automotive Telematics and Body Electronics
•	Conversions from Standard 24V, 12V and 5V Input Rails

Typical Application

click for larger image

Parameters Values

Output Current 1000 mA

Input Min Voltage 4.5 Volt

Input Max Voltage 42 Volt

Output Min 1.285 Volt

Frequency Min 200 kHz

Frequency Max 1000 kHz

Efficiency (peak) 92 %

On/Off Pin Yes

Error Flag No

SoftStart Yes

Sync Pin Yes

Inverting Yes

Flyback No

RegType Switching Regulator

Temperature Min -40 deg C

Temperature Max 125 deg C

Adjustable Output Yes

Adj Switch Frequency Yes

PWM Mode Voltage Mode Control

Topology Buck

Special Features 500 kHz Default Switching Frequency

Step-Down Yes

Multiple Output Capability No

Switching Frequency 500 kHz

Feedback Voltage 1.285 Volt

Regulator Family SIMPLE SWITCHER

Automotive No

PowerWise No

Synchronous Rectification No

Typical Performance

click for larger image

WEBENCH Live Simulation!

LM22672
4.50 <=	V in Lower V	<=	V in Upper V	<= 42.00
V out	1.28 <=		V	<= 37.00
I out			A	<= 1.00
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM22670▲	3A, Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM22671▲	0.5A Version
LM22673▲	3A, Features Adjustable Soft-Start And Adjustable Current Limit
LM22675▲	Features Precision Enable Only
LM22677▲	5A, Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM22679▲	5A, Features Adjustable Soft-Start And Adjustable Current Limit
LM22680▲	2A Version

Additional Resources

Online Seminars

New Generation SIMPLE SWITCHER® Regulator Family Technical Overview

Design Tools

Application Notes

Connection Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM22672 1A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features	399 Kbytes	24-Nov-08	Download
LM22672 1A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features (Japanese)	741 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

Weeks

Qty

$US each

LM22672MR-5.0

PSOP

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.78

rail
of
95

NSXYTT
L22672
5.0

8 weeks

N/A

LM22672MR-ADJ

PSOP

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.78

rail
of
95

NSXYTT
L22672
ADJ

12 weeks

N/A

LM22672MRE-5.0

PSOP

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.78

reel
of
250

NSXYTT
L22672
5.0

8 weeks

N/A

LM22672MRE-ADJ

PSOP

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.78

reel
of
250

NSXYTT
L22672
ADJ

12 weeks

N/A

LM22672MRX-5.0

PSOP

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.78

reel
of
2500

NSXYTT
L22672
5.0

12 weeks

N/A

LM22672MRX-ADJ

PSOP

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.78

reel
of
2500

NSXYTT
L22672
ADJ

12 weeks

N/A

LM22672EVAL

Evaluation Board for LM22672 & LM22675, 1A SIMPLE SWITCHER regulators with Adj Vout, Adj Freq or Freq Synch, Precision Enable & Soft start

Full production

N/A

$24.00

8 weeks

N/A

General Description

The LM22672 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 1A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version.

The SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH ® design tool. National’s WEBENCH ® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The switching frequency can also be adjusted with an external resistor or synchronized to an external clock up to 1MHz. It is also possible to self-synchronize multiple regulators to share the same switching frequency. The LM22672 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.

Reliability Metrics

Part Number	Process	EFR Sample Size	LTA Device Hours	FITS	MTTF (Hours)
LM22672MR-5.0	ABCD5	5364	1626984	3	461661152
LM22672MR-ADJ	ABCD5	5364	1626984	3	461661152
LM22672MRE-5.0	ABCD5	5364	1626984	3	461661152
LM22672MRE-ADJ	ABCD5	5364	1626984	3	461661152
LM22672MRX-5.0	ABCD5	5364	1626984	3	461661152
LM22672MRX-ADJ	ABCD5	5364	1626984	3	461661152

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
"Downloadable LM2267x, LM22680 Quick Start Simple Switcher Component Calculator"	1413 Kbytes	12-Jan-2009	View

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Application Notes

Title	Size in Kbytes	Date
AN-1896: Application Note 1896 LM22672 Evaluation Board	258 Kbytes	14-Oct-08	Download
AN-1930: Application Note 1930 SIMPLE SWITCHER® Regulators Take Over Automotive Applications	85 Kbytes	7-Jan-09	Download
AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies	612 Kbytes	14-Oct-08	Download

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More Application Notes

Title	Size in Kbytes	Date
AN-1888: Application Note 1888 LM22670 Evaluation Board Inverting Topology and Application Notes	1020 Kbytes	9-Jul-09	Download
AN-1888 (Japanese): Application Note 1888 LM22670 Evaluation Board Inverting Topology and Application Notes	566 Kbytes
AN-1895: Application Note 1895 LM22671 Evaluation Board	249 Kbytes	14-Oct-08	Download
AN-1891: Application Note 1891 LM22679 Evaluation Board	232 Kbytes	14-Oct-08	Download
AN-1894: Application Note 1894 LM22673 Evaluation Board	255 Kbytes	14-Oct-08	Download
AN-1892: Application Note 1892 LM22677 Evaluation Board	237 Kbytes	14-Oct-08	Download
AN-1892 (Japanese): Application Note 1892 LM22677 Evaluation Board	287 Kbytes
AN-1885: Application Note 1885 LM22670 Evaluation Board	499 Kbytes	14-Oct-08	Download

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

[Information as of 7-Nov-2009]