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LM27341QMY

更新时间： 2024-09-15 11:51:03
品牌 Logo 应用领域
美国国家半导体 - NSC 调节器
页数 文件大小 规格书
30页 732K
描述
2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization

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LM27341QMY 数据手册

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February 9, 2010  
LM27341/LM27342/  
LM27341Q/LM27342Q  
2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC  
Regulator with Frequency Synchronization  
General Description  
Features  
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 tran-  
sient response and accurate regulation in the smallest possi-  
ble PCB area.  
Space saving 3 x 3 mm LLP-10 & eMSOP-10 package  
■
Wide input voltage range  
Wide output voltage range  
3V to 20V  
1V to 18V  
■
■
■
■
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LM27341 delivers 1.5A maximum output current  
LM27342 delivers 2A maximum output current  
High switching frequency  
2 MHz  
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 cir-  
cuitry allows for on-times as low as 65 ns, thus supporting  
exceptionally high frequency conversion. Switching frequen-  
cy 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 fre-  
quency 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 pro-  
vide high-performance regulation over a wide range of oper-  
ating conditions. Additional features include internal soft-start  
circuitry to reduce inrush current, pulse-by-pulse current limit,  
thermal shutdown, and output over-voltage protection.  
Frequency synchronization  
2.35 MHz  
1.00 MHz < fSW <  
150 mΩ NMOS switch with internal bootstrap supply  
70 nA shutdown current  
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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  
Applications  
Local 12V to Vcore Step-Down Converters  
■
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Radio Power Supply  
Core Power in HDDs  
Set-Top Boxes  
Automotive  
USB Powered Devices  
DSL Modems  
Typical Application Circuit  
30005674  
30005676  
Efficiency vs Load Current  
VOUT = 5V, fsw = 2 MHz  
© 2010 National Semiconductor Corporation  
300056  
www.national.com  
1234567...30

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与LM27341QMY相关器件

型号 品牌 获取价格 描述 数据表
LM27341QMY/NOPB TI

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 		LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341QMYX NSC

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 		2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341QMYX/NOPB TI

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 		LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341SD NSC

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 		2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341SD/NOPB TI

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 		LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341SDX NSC

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 		2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341SDX/NOPB TI

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 		1.5A - Wide Input Range Buck Regulator with Frequency Synchronization 10-WSON -40 to 125
LM27342 TI

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 		LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27342MY NSC

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 		2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27342MY/NOPB TI

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 		LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul

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