LM27341QMYX

更新时间： 2024-11-25 05:42:03

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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LM27341QMYX 数据手册

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

■

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 < f_SW<

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

Applications

Local 12V to Vcore Step-Down Converters

■

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

V_OUT= 5V, f_sw= 2 MHz

300056

www.national.com

12 3 4 5 6 7...30

中文翻译

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与LM27341QMYX相关器件

型号	品牌	获取价格	描述	数据表
LM27341QMYX/NOPB	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341SD	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341SD/NOPB	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341SDX	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341SDX/NOPB	TI	获取价格	1.5A - Wide Input Range Buck Regulator with Frequency Synchronization 10-WSON -40 to 125
LM27342	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27342MY	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27342MY/NOPB	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27342MYX	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27342MYX/NOPB	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul

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