Features Space saving 3 x 3 mm LLP-10 & eMSOP-10 package Wide input voltage range   3V to 20V Wide output voltage range  1V to 18V LM27341 delivers 1.5A maximum output current LM27342 delivers 2A maximum output current High switching frequency   2 MHz Frequency synchronization  1.00 MHz < fSW < 2.35 MHz 150 mΩ NMOS switch with internal bootstrap supply 70 nA shutdown current Internal voltage reference accuracy of 1% Peak Current-Mode, PWM operation Thermal shutdown LM27341Q and LM27342Q are AEC-Q100 Grade 1 qualified and are manufactured on an Automotive Grade Flow Description The LM27341 and LM27342 regulators are monolithic, high frequency, PWM step-down DC-DC converters in 10-pin LLP and 10-pin eMSOP packages. They contain all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components the LM27341 and LM27342 are easy to use. The ability to drive 1.5A or 2A loads respectively, with an internal 150 mΩ NMOS switch results in the best power density available. The world-class control circuitry allows for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown is included featuring an ultra-low shutdown current of 70 nA. The LM27341and LM27342 utilize peak current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection. Applications Local 12V to Vcore Step-Down Converters Radio Power Supply Core Power in HDDs Set-Top Boxes Automotive USB Powered Devices DSL Modems

Also Recommended LM27342▲ 2A Version LM2738▲ 1.5A Version, No Frequency Sync Typical Application

Typical Application click for larger image Typical Application	Block Diagram click for larger image LM27342 Block Diagram
Typical Performance click for larger image Efficiency Vout = 5V, Linear Scale, Fsw = 2MHZ

Datasheets

Title		Size	Date	Other Language
	LM27341 1.5A - Wide Input Range Buck Regulator with Frequency Synchronization	749 Kbytes	9-Feb-10	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1197: Application Note 1197	371 Kbytes	1-May-04	日本語 中文
	AN-1520: Application Note 1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages	2176 Kbytes	7-Sep-06	中文
	AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators	348 Kbytes	25-Jun-09
	AN-1229: Application Note 1229 ®SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-May-04	日本語 中文
	AN-1929: Application Note 1929 LM27342 Demonstration Board	507 Kbytes	20-Nov-08
	AN-1187: Application Note 1187 Leadless Leadframe Package (LLP)	28870 Kbytes	1-Nov-11	日本語 中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM27341MY/NOPB RoHS Status	MINI SOIC EXP PAD	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 975 DIGI-KEY Worldwide 1949 MOUSER Worldwide 987 NEWARK Americas 956	$1.35 each at 1K+ pcs	reel of 1000
LM27341MYX/NOPB RoHS Status	MINI SOIC EXP PAD	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.35 each at 1K+ pcs	reel of 3500
LM27341QMY/NOPB RoHS Status	MINI SOIC EXP PAD	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 1994 MOUSER Worldwide 1000	$1.59 each at 1K+ pcs	reel of 1000
LM27341QMYX/NOPB RoHS Status	MINI SOIC EXP PAD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.59 each at 1K+ pcs	reel of 3500
LM27341SD/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2000 DIGI-KEY Worldwide 1268 FARNELL Europe and Asia 500 MOUSER Worldwide 1000 NEWARK Americas 495 TAYLOR Americas 2000	$1.35 each at 1K+ pcs	reel of 1000
LM27341SDX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.35 each at 1K+ pcs	reel of 4500

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

Moisture Sensitivity Level Data for LM27341.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM27341 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM27341MY/NOPB	30.155	MINI SOIC EXP PAD	10	3	260	Detail	Download	N/A	ZXTT SSCB
LM27341MYX/NOPB	30.155	MINI SOIC EXP PAD	10	3	260	Detail	Download	N/A	ZXTT SSCB
LM27341QMY/NOPB	30.155	MINI SOIC EXP PAD	10	3	260	Detail	Download	N/A	ZXTT SSJB
LM27341QMYX/NOPB	30.155	MINI SOIC EXP PAD	10	3	260	Detail	Download	N/A	ZXTT SSJB
LM27341SD/NOPB	21.112	LLP	10	1	260	Detail	Download	N/A	ZXYTT L231B
LM27341SDX/NOPB	21.112	LLP	10	1	260	Detail	Download	N/A	ZXYTT L231B

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

Moisture Sensitivity Level Data for LM27341.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM27341 is located at RoHS Status.

CAD Symbols and Models Download LM27341 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM27341MY	PVIP050	0	14280	0	0	1755000	3	497986041
LM27341MYX	PVIP050	0	14280	0	0	1755000	3	497986041
LM27341QMY	PVIP050	0	14280	0	0	1755000	3	497986041
LM27341QMYX	PVIP050	0	14280	0	0	1755000	3	497986041
LM27341SD	PVIP050	0	14280	0	0	1755000	3	497986041
LM27341SDX	PVIP050	0	14280	0	0	1755000	3	497986041

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/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM27341.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM27341 is located at RoHS Status.