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LM27342-Q1 PDF预览

LM27342-Q1

更新时间： 2024-11-26 00:49:15
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德州仪器 - TI /
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描述
LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization

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LM27342-Q1 数据手册

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LM27341, LM27342, LM27341-Q1, LM27342-Q1  
www.ti.com  
SNVS497E –NOVEMBER 2008–REVISED APRIL 2013  
LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down  
DC-DC Regulator with Frequency Synchronization  
Check for Samples: LM27341, LM27342, LM27341-Q1, LM27342-Q1  
1
FEATURES  
DESCRIPTION  
The LM27341 and LM27342 regulators are  
monolithic, high frequency, PWM step-down DC-DC  
converters in 10-pin SON and 10-pin MSOP-  
PowerPad 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.  
2
•
Space Saving 3 x 3 mm 10-Pin SON and  
MSOP-PowerPad Packages  
•
•
•
Wide Input Voltage Range: 3V to 20V  
Wide Output Voltage Range: 1V to 18V  
LM27341 Delivers 1.5A Maximum Output  
Current  
With  
a
minimum of external components the  
•
•
•
LM27342 Delivers 2A Maximum Output Current  
High Switching Frequency: 2 MHz  
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 Synchronization: 1.00 MHz < fSW  
2.35 MHz  
<
•
150 mΩ NMOS Switch with Internal Bootstrap  
Supply  
frequency is internally set to  
2
MHz and  
•
•
•
•
•
70 nA Shutdown Current  
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 LM27341  
and 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,  
Internal Voltage Reference Accuracy of 1%  
Peak Current-Mode, PWM Operation  
Thermal Shutdown  
LM27341-Q1 and LM27342-Q1 are AEC-Q100  
Grade 1 Qualified and are Manufactured on an  
Automotive Grade Flow  
APPLICATIONS  
•
•
•
•
•
•
•
Local 12V to Vcore Step-Down Converters  
Radio Power Supply  
Core Power in HDDs  
Set-Top Boxes  
thermal  
protection.  
shutdown,  
and  
output  
over-voltage  
Automotive  
USB Powered Devices  
DSL Modems  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008–2013, Texas Instruments Incorporated  
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LM27342-Q1 替代型号

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