Features • Space saving 3 x 3 mm LLP-10 & eMSOP-10 package • Wide input voltage range   3V to 20V • Wide input 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 LM27341▲ 1.5A Version LM2738▲ 1.5A Version, No Frequency Sync Typical Application MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LM27341/LM27342/LM27341Q/LM27342Q 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization	749 Kbytes	22-Oct-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1929: Application Note 1929 LM27342 Demonstration Board	507 Kbytes	20-Nov-08
	AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators	348 Kbytes	25-Jun-09
	AN-1197: Application Note 1197 Selecting Inductors for Buck Converters	371 Kbytes	1-May-04	日本語 中文
	AN-1187: Application Note 1187 Leadless Leadframe Package (LLP)	2065 Kbytes	11-Oct-07	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-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-May-04	日本語 中文

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