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 option: •  -ADJ (outputs as low as 1.285V) • ±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 Description The LM22680 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 2A 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 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 LM22680 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. Applications • Industrial Control • Telecom and Datacom Systems • Embedded Systems • Automotive Telematics and Body Electronics • Conversions from Standard 24V, 12V and 5V Input Rails

LM22680   4.50 <= V in Lower  V   <= V in Upper  V   <= 42.00 V out 1.28 <=  V <= 37.00 I out    A <= 2.00 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 LM22672▲ 1A Version LM22673▲ 3A, Features Adjustable Soft-Start And Adjustable Current Limit LM22674▲ 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 MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM22680 2A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features	592 Kbytes	18-Dec-09	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1911: Application Note 1911 LM22680 Evaluation Board	407 Kbytes	12-Dec-08
	AN-1930: Application Note 1930 SIMPLE SWITCHER® Regulators Take Over Automotive Applications	85 Kbytes	7-Jan-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM22680MR-ADJ/NOPB RoHS Status	PSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 150 DIGIKEY Worldwide 0 FUTURE Worldwide 644	$1.85 each at 1K+ pcs	rail of 95
LM22680MRE-ADJ/NOPB RoHS Status	PSOP	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 1500 DIGIKEY Worldwide 1547 FUTURE Worldwide 500 NEWARK Americas 324	$1.85 each at 1K+ pcs	reel of 250
LM22680MRX-ADJ/NOPB RoHS Status	PSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.85 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM22680MR-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22680 -ADJ
LM22680MRE-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22680 -ADJ
LM22680MRX-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22680 -ADJ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools

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

CAD Symbols and Models Download LM22680 CAD Symbols

Models N/A

LM22680   4.50 <= V in Lower  V   <= V in Upper  V   <= 42.00 V out 1.28 <=  V <= 37.00 I out    A <= 2.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools?

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM22680MR-ADJ	ABCD5	0	5364	0	0	1626984	3	461661152
LM22680MRE-ADJ	ABCD5	0	5364	0	0	1626984	3	461661152
LM22680MRX-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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.