Datasheet > 电源电路 > 开关式稳压器或控制器> LM27342SD

LM27342SD

更新时间： 2024-11-09 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	715K
描述
2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization

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LM27342SD 数据手册

December 16, 2008

LM27341/LM27342

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

3 to 20 V

1 to 18 V

■

LM27341 delivers 1.5A maximum output current

LM27342 delivers 2A maximum output current

High switching frequency

Frequency synchronization 1.00 MHz < f_SW< 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

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.

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LM27342SD相关器件

型号	品牌	获取价格	描述	数据表
LM27342SD/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
LM27342SDX	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27342SDX/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
LM2734-Q1	TI	获取价格	具有轻负载效率的 3V 至 20V 输入电压、1A、汽车类降压转换器
LM2734XMK	NSC	获取价格	Thin SOT23 1A Load Step-Down DC-DC Regulator
LM2734XMK/NOPB	TI	获取价格	LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
LM2734XMKX	NSC	获取价格	Thin SOT23 1A Load Step-Down DC-DC Regulator
LM2734XMKX/NOPB	TI	获取价格	LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
LM2734XQMK/NOPB	TI	获取价格	LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
LM2734XQMKE/NOPB	TI	获取价格	LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator

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