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LM3671MFX-ADJ

更新时间： 2024-11-13 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
16页	964K
描述
2MHz , 600mA Step-Down DC-DC Converter in SOT23-5

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LM3671MFX-ADJ 数据手册

November 2004

LM3671

2MHz , 600mA Step-Down DC-DC Converter in SOT23-5

n 2 MHz PWM fixed switching frequency (typ)

n Automatic PFM/PWM mode switching

n Available in fixed output voltages and adjustable version

n SOT23-5 package

n Internal synchronous rectification for high efficiency

n Internal soft start

n 0.01 µA typical shutdown current

General Description

The LM3671 step-down DC-DC converter is optimized for

powering ultra-low voltage circuits from a single Li-Ion cell or

3 cell NiMH/NiCd batteries. It provides up to 600mA load

current, over an input voltage range from 2.8V to 5.5V. There

are several different fixed voltage output options available as

well as an adjustable output voltage version.

n Operates from a single Li-Ion cell or 3 cell NiMH/NiCd

batteries

n Only three tiny surface-mount external components

required (one inductor, two ceramic capacitors)

n Current overload and Thermal shutdown protection

The device offers superior features and performance for

mobile phones and similar portable applications with com-

plex power management systems. Automatic intelligent

switching between PWM low-noise and PFM low-current

mode offers improved system control. During full-power op-

eration, a fixed-frequency 2 MHz (typ). PWM mode drives

loads from ∼70 mA to 600 mA max. Hysteretic PFM mode

extends the battery life through reduction of the quiescent

current to 16 µA (typ) at light loads and system standby.

Internal synchronous rectification provides high efficiency. In

shutdown mode (Enable pin pulled low) the device turns off

and reduces battery consumption to 0.01 µA (typ).

Applications

n Mobile phones

n PDAs

n MP3 players

n W-LAN

n Portable instruments

n Digital still cameras

n Portable Hard disk drives

The LM3671 is available in a SOT23-5 package with Pb and

No Pb (Lead free) versions. A high switching frequency - 2

MHz (typ) - allows use of tiny surface-mount components.

Only three external surface-mount components, an inductor

and two ceramic capacitors, are required.

Features

n 16 µA typical quiescent current

n 600 mA maximum load capability

Typical Application Circuits

20108401

FIGURE 1. Typical Application Circuit

DS201084

www.national.com

12 3 4 5 6 7...16

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与LM3671MFX-ADJ相关器件

型号	品牌	获取价格	描述	数据表
LM3671MFX-ADJ/NOPB	TI	获取价格	LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
LM3671MFX-ADJ/NOPB	NSC	获取价格	IC 1.15 A SWITCHING REGULATOR, 2600 kHz SWITCHING FREQ-MAX, PDSO5, 2.92 X 2.84 MM, 1.20 MM
LM3671-Q1	TI	获取价格	2MHz、600mA 降压直流/直流转换器
LM3671QMF-1.2/NOPB	TI	获取价格	LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
LM3671QMFX-1.2/NOPB	TI	获取价格	LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
LM3671QTL-1.8/NOPB	TI	获取价格	LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
LM3671QTLX-1.8/NOPB	TI	获取价格	LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
LM3671TL-1.2	NSC	获取价格	2MHz, 600mA Step-Down DC-DC Converter
LM3671TL-1.2/NOPB	TI	获取价格	LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
LM3671TL-1.2/NOPB	NSC	获取价格	IC 1.15 A SWITCHING REGULATOR, 2600 kHz SWITCHING FREQ-MAX, PBGA5, 1.05 X 1.38 MM, 0.60 MM

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