Datasheet > LM3670MF-ADJ

LM3670MF-ADJ

更新时间： 2024-11-13 22:07:55

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
17页	994K
描述
Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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LM3670MF-ADJ 数据手册

December 2004

LM3670

Miniature Step-Down DC-DC Converter for Ultra Low

Voltage Circuits

General Description

Features

n V_OUT= adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V

n 2.5V ≤ V_IN≤ 5.5V

The LM3670 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 350 mA load

current, over an input voltage range from 2.5V to 5.5V. There

are several different fixed voltage output options available as

well as an adjustable output voltage version.

n 15 µA typical quiescent current

n 350 mA maximum load capability

n 1 MHz PWM fixed switching frequency (typ.)

n Automatic PFM/PWM mode switching

n Available in fixed output voltages as well as an

adjustable version

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 1 MHz (typ). PWM mode drives

loads from ∼70 mA to 350 mA max, with up to 95% efficiency.

Hysteretic PFM mode extends the battery life through reduc-

tion of the quiescent current to 15 µA (typ) during light

current loads and system standby. Internal synchronous rec-

tification provides high efficiency (90 to 95% typ. at loads

between 1 mA and 100 mA). In shutdown mode (Enable pin

pulled low) the device turns off and reduces battery con-

sumption to 0.1 µA (typ.).

n SOT23-5 package

n Low drop out operation - 100% duty cycle mode

n Internal synchronous rectification for high efficiency

n Internal soft start

n 0.1 µA typical shutdown current

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 protection

The LM3670 is available in a SOT23-5 package. A high

switching frequency - 1 MHz (typ) - allows use of tiny

surface-mount components. Only three external surface-

mount components, an inductor and two ceramic capacitors,

are required.

Applications

n Mobile phones

n Hand-Held Radios

n Personal Digital Assistants

n Palm-top PCs

n Portable Instruments

n Battery Powered Devices

Typical Application

20075801

FIGURE 1. 1.8V - Fixed Output Voltage - Typical Application Circuit

DS200758

www.national.com

12 3 4 5 6 7...17

中文翻译

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与LM3670MF-ADJ相关器件

型号	品牌	获取价格	描述	数据表
LM3670MF-ADJ/NOPB	NSC	获取价格	IC 0.75 A SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO5, ROHS COMPLIANT, SOT-23,
LM3670MF-ADJ/NOPB	TI	获取价格	LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670MFX-1.2	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670MFX-1.2	TI	获取价格	Miniature Step-Down DC-DC Converter for Ultralow Voltage Circuits
LM3670MFX-1.2/NOPB	TI	获取价格	用于超低电压电路的微型降压直流/直流转换器 \| DBV \| 5 \| -40 to 85
LM3670MFX-1.5	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670MFX-1.5	TI	获取价格	0.75A SWITCHING REGULATOR, 1300kHz SWITCHING FREQ-MAX, PDSO5, SOT-23, 5 PIN
LM3670MFX-1.5/NOPB	TI	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits 5-SOT-23 -40 to 85
LM3670MFX-1.6	TI	获取价格	0.75A SWITCHING REGULATOR, 1300kHz SWITCHING FREQ-MAX, PDSO5, SOT-23, 5 PIN
LM3670MFX-1.6	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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