LM22673 - 3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit

LM22673

3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit

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Features

• Wide input voltage range: 4.5V to 42V

• Internally compensated voltage mode control

• Stable with low ESR ceramic capacitors

• 120 mΩ N-channel MOSFET TO-263 THIN package

• 100 mΩ N-channel MOSFET PSOP-8 package

• Output voltage options:
• -ADJ (outputs as low as 1.285V)
• -5.0 (output fixed to 5V)

• ±1.5% feedback reference accuracy

• Switching frequency of 500kHz

• -40°C to 125°C operating junction temperature range

• Adjustable soft-start

• Adjustable current limit

• Integrated boot diode

• Fully Webench ® enabled

• Step-down and inverting buck-boost applications

Description
The LM22673 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 3A 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 LM22673 series also has built in thermal shutdown and current limiting. The current limit threshold can be adjusted using an external resistor. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.

Applications

• Industrial Control

• Telecom and Datacom Systems

• Embedded Systems

• Automotive Telematics and Body Electronics

• Conversions from Standard 24V, 12V and 5V Input Rails

LM22673

4.50 <= V in Lower
V
<= V in Upper
V
<= 42.00

V out 1.28 <= V <= 37.00

I out A <= 3.00

Ambient Temperature °C <= 100

What are WEBENCH® tools?

Also Recommended

LM22670▲ Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable

LM22671▲ 0.5A Version

LM22672▲ 1A Version

LM22676▲ Features Precision Enable

LM22679▲ 5A Version

LM22680▲ 2A Version

MY BRIEFCASE

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LM22673

Also Recommended

LM22670▲	Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM22671▲	0.5A Version
LM22672▲	1A Version
LM22676▲	Features Precision Enable
LM22679▲	5A Version
LM22680▲	2A Version

Typical Application click for larger image

Connection Diagram *click for larger image

*click for larger image

Typical Performance click for larger image

Paramaters / Values	LM22673	LM22670	LM22671	LM22672	LM22676	LM22679	LM22680
Output Current	3000 mA	3000 mA	500 mA	1000 mA	3000 mA	5000 mA	2000 mA
Input Min Voltage	4.5 Volt	4.5 Volt	4.5 Volt	4.5 Volt	4.5 Volt	4.5 Volt	4.5 Volt
Input Max Voltage	42 Volt	42 Volt	42 Volt	42 Volt	42 Volt	42 Volt	42 Volt
Output Min	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt
Efficiency (peak)	92 %	92 %	91 %	92 %	92 %	92 %	89 %
On/Off Pin	No	Yes	Yes	Yes	Yes	No	Yes
Error Flag	No	No	No	No	No	No	No
SoftStart	Yes	No	Yes	Yes	No	Yes	Yes
Sync Pin	No	Yes	Yes	Yes	No	No	Yes
Inverting	Yes	Yes	No	Yes	Yes	Yes
Flyback	No	No	No	No	No	No	No
RegType	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C	125 deg C	125 deg C	125 deg C	125 deg C
Adjustable Output	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Adj Switch Frequency	No	Yes	Yes	Yes	No	No	Yes
PWM Mode	Voltage Mode Control	Voltage Mode Control	Voltage Mode Control	Voltage Mode Control	Voltage Mode Control	Voltage Mode Control	Voltage Mode Control
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Special Features	Adjustable Current Limit	500 kHz Default Switching Frequency	500 kHz Default Switching Fequency	500 kHz Default Switching Frequency	500 kHz Switching Frequency	Adjustable Current Limit
Step-Down	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Multiple Output Capability	No	No	No	No	No	No	No
Switching Frequency	500 kHz	500 kHz	500 kHz	500 kHz	500 kHz	500 kHz	500 kHz
Feedback Voltage	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt	1.285 Volt
Regulator Family	SIMPLE SWITCHER	SIMPLE SWITCHER	SIMPLE SWITCHER	SIMPLE SWITCHER	SIMPLE SWITCHER	SIMPLE SWITCHER	SIMPLE SWITCHER
Automotive	No	No	No	No	No	No
PowerWise	No	No	No	No	No	No	No
Synchronous Rectification	No	No	No	No	No	No	No

Datasheet
Title Size Date Other
Language

LM22673 3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit 475
Kbytes 24-Nov-08 日本語

Featured Application Notes
Title Size Date Other
Language

AN-1894: Application Note 1894 LM22673 Evaluation Board 255
Kbytes 14-Oct-08

AN-1930: Application Note 1930 SIMPLE SWITCHER® Regulators Take Over Automotive Applications 85
Kbytes 7-Jan-09

AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies 612
Kbytes 14-Oct-08

More Application Notes
Title Size Date Other
Language

AN-1888: Application Note 1888 LM22670 Evaluation Board Inverting Topology and Application Notes 1020
Kbytes 9-Jul-09 日本語

AN-1895: Application Note 1895 LM22671 Evaluation Board 249
Kbytes 14-Oct-08

AN-1896: Application Note 1896 LM22672 Evaluation Board 258
Kbytes 14-Oct-08

AN-1891: Application Note 1891 LM22679 Evaluation Board 232
Kbytes 14-Oct-08

AN-1892: Application Note 1892 LM22677 Evaluation Board 237
Kbytes 14-Oct-08 日本語

AN-1885: Application Note 1885 LM22670 Evaluation Board 499
Kbytes 14-Oct-08

Part Number(s)
(NSID)

Top View

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LM22673MR-5.0/NOPB

RoHS

PSOP

Full production
Lead Time: 16 weeks

Distributor	Region	Qty
ARROW	Worldwide	190
DIGIKEY	Worldwide	0
FUTURE	Worldwide	190

$1.98 each at 1K+ pcs

rail
of
95

LM22673MR-ADJ/NOPB

RoHS

PSOP

Full production
Lead Time: 16 weeks

Distributor	Region	Qty
ARROW	Worldwide	85
AVNET-EM	Worldwide	35
DIGIKEY	Worldwide	0
FUTURE	Worldwide	179

$1.98 each at 1K+ pcs

rail
of
95

LM22673MRE-5.0/NOPB

RoHS

PSOP

Full production
Lead Time: 16 weeks

Distributor	Region	Qty
ARROW	Worldwide	5250
DIGIKEY	Worldwide	1074
FUTURE	Worldwide	400
NEWARK	Americas	264

$1.98 each at 1K+ pcs

reel
of
250

LM22673MRE-ADJ/NOPB

RoHS

PSOP

Full production
Lead Time: 16 weeks

Distributor	Region	Qty
DIGIKEY	Worldwide	484
FUTURE	Worldwide	300
NEWARK	Americas	110

$1.98 each at 1K+ pcs

reel
of
250

LM22673MRX-5.0/NOPB

RoHS

PSOP

Full production
Lead Time: 16 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$1.98 each at 1K+ pcs

reel
of
2500

LM22673MRX-ADJ/NOPB

RoHS

PSOP

Full production
Lead Time: 16 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$1.98 each at 1K+ pcs

reel
of
2500

LM22673TJE-5.0/NOPB

RoHS

TO-263 THIN

Full production
Lead Time: 16 weeks

Distributor	Region	Qty
ARROW	Worldwide	250
DIGIKEY	Worldwide	429
FUTURE	Worldwide	238
NEWARK	Americas	135

$1.98 each at 1K+ pcs

reel
of
250

LM22673TJE-ADJ/NOPB

RoHS

TO-263 THIN

Full production
Lead Time: 16 weeks

Distributor	Region	Qty
ARROW	Worldwide	250
DIGIKEY	Worldwide	5
FUTURE	Worldwide	250
NEWARK	Americas	43

$1.98 each at 1K+ pcs

reel
of
250

LM22673TJ-5.0/NOPB

RoHS

TO-263 THIN

Full production
Lead Time: 16 weeks

Distributor		Region	Qty
ARROW		Worldwide	1000
DIGIKEY		Worldwide	0

$1.98 each at 1K+ pcs

reel
of
1000

LM22673TJ-ADJ/NOPB

RoHS

TO-263 THIN

Full production
Lead Time: 16 weeks

Distributor		Region	Qty
ARROW		Worldwide	989
DIGIKEY		Worldwide	0

$1.98 each at 1K+ pcs

reel
of
1000

Part Number(s)
(NSID)

Description

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LM22673EVAL

Evaluation Board for LM22673, 3A Adjustable Output Voltage Evaluation Board Features: Adjustable Soft-Start, and Adjustable Switching Frequency

Full production
Lead Free (RoHS)

Distributor	Region	Qty
AVNET-EM	Worldwide	5
DIGIKEY	Worldwide	18
FUTURE	Worldwide	2
NATIONAL	Worldwide	67

$24.00 each

Description:

The LM22673 evaluation board is designed to demonstrate the capabilities of the LM22673 switching regulator. The LM22673 evaluation board is configured to provide an output voltage of 3.3V up to 3A load current with an input voltage range of 4.5V to 42V. Due to the low R_DS(ON) of the integrated N-channel MOSFET and maximum duty-cycle limitations, the minimum input voltage of 4.5V will only provide a 3.3V output voltage for load currents up to 500 mA. For load currents higher than 500 mA, an input voltage of 5.5V or higher is required. The typical operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 50 °C.

Features:

Input Range: 4.5V to 42V
Output Voltage: 3.3V
Output Current Range: 0A to 3A
Frequency of Operation: 500 kHz
Board Size: 1.5 X 1.5 inches
Package: PSOP-8

At low input voltages between 4.5V and 6V, a minimum load of approximately 5 mA may be required to reach a regulated 3.3V output voltage.To aid in the design and evaluation of DC/DC buck converter solutions based on the LM22673 switching regulator, the evaluation board can be re-configured for different output voltages.

Contents:

LM22673 Assembled Evaluation Board
Application Note 1894 for the LM22673 Evaluation Board
LM22673 Datasheet

Part Number(s) (NSID)	Type	Pins	MSL Rating	Peak Reflow	RoHS	CAD Symbols	Models	Package Marking Format
LM22673MR-5.0/NOPB	PSOP	8	3	260	RoHS	N/A	N/A	NSXYTT L22673 5.0
LM22673MR-ADJ/NOPB	PSOP	8	3	260	RoHS	N/A	N/A	NSXYTT L22673 ADJ
LM22673MRE-5.0/NOPB	PSOP	8	3	260	RoHS	N/A	N/A	NSXYTT L22673 5.0
LM22673MRE-ADJ/NOPB	PSOP	8	3	260	RoHS	N/A	N/A	NSXYTT L22673 ADJ
LM22673MRX-5.0/NOPB	PSOP	8	3	260	RoHS	N/A	N/A	NSXYTT L22673 5.0
LM22673MRX-ADJ/NOPB	PSOP	8	3	260	RoHS	N/A	N/A	NSXYTT L22673 ADJ
LM22673TJE-5.0/NOPB	TO-263 THIN	7	1	260	RoHS	N/A	N/A	NSUZXYTTE# LM22673 TJ-5.0
LM22673TJE-ADJ/NOPB	TO-263 THIN	7	1	260	RoHS	N/A	N/A	NSUZXYTTE# LM22673 TJ-ADJ
LM22673TJ-5.0/NOPB	TO-263 THIN	7	1	260	RoHS	N/A	N/A	NSUZXYTTE# LM22673 TJ-5.0
LM22673TJ-ADJ/NOPB	TO-263 THIN	7	1	260	RoHS	N/A	N/A	NSUZXYTTE# LM22673 TJ-ADJ

Design Tools
Title Size Date

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

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)

LM22673MR-5.0 ABCD5 0 5364 0 0 1626984 3 461661152

LM22673MR-ADJ ABCD5 0 5364 0 0 1626984 3 461661152

LM22673MRE-5.0 ABCD5 0 5364 0 0 1626984 3 461661152

LM22673MRE-ADJ ABCD5 0 5364 0 0 1626984 3 461661152

LM22673MRX-5.0 ABCD5 0 5364 0 0 1626984 3 461661152

LM22673MRX-ADJ ABCD5 0 5364 0 0 1626984 3 461661152

LM22673TJ-5.0 ABCD5 0 5364 0 0 1626984 3 461661152

LM22673TJ-ADJ ABCD5 0 5364 0 0 1626984 3 461661152

LM22673TJE-5.0 ABCD5 0 5364 0 0 1626984 3 461661152

LM22673TJE-ADJ ABCD5 0 5364 0 0 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.

[Information as of 20-Nov-2009]