LM3677

更新时间： 2024-11-15 04:44:23

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
20页	8091K
描述
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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LM3677 数据手册

March 2007

LM3677

3MHz, 600mA Miniature Step-Down DC-DC Converter for

Ultra Low Voltage Circuits

General Description

The LM3677 step-down DC-DC converter is optimized for

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

battery and input voltage rails from 2.7V to 5.5V. It provides

up to 600mA load current, over the entire input voltage range.

The LM3677 is configured to four output voltages of 1.3V,

1.5V, 1.8V and 2.5V.

Features

16 µA typical quiescent current

■

600 mA maximum load capability

3 MHz PWM fixed switching frequency (typ)

Automatic PFM/PWM mode switching

Available in 5-bump micro SMD package

Internal synchronous rectification for high efficiency

The device offers superior features and performance for mo-

bile phones and similar portable applications with complex

power management systems. Automatic intelligent switching

between PWM low-noise and PFM low-current mode offers

improved system control. During PWM mode operation, the

device operates at a fixed-frequency of 3 MHz (typ). PWM

mode drives loads from ~ 80mA to 600mA max. Hysteretic

PFM mode extends the battery life by reducing the quiescent

current to 16 µA (typ) during light load and standby operation.

Internal synchronous rectification provides high efficiency. In

shutdown mode (Enable pin pulled down), the device turns

off and reduces battery consumption to 0.01 µA (typ).

Internal soft start

0.01 µA typical shutdown current

Operates from a single Li-Ion cell battery

■

Only three tiny surface-mount external components

required (solution size less than 20 mm²)

Current overload and Thermal shutdown protection

■

Applications

Mobile phones

■

PDAs

The LM3677 is available in a lead-free (NO PB) 5-bump micro

SMD package. A switching frequency of 3 MHz (typ) allows

use of tiny surface-mount components. Only three external

surface-mount components, an inductor and two ceramic ca-

pacitors, are required.

MP3 players

W-LAN

Portable Instruments

Digital still cameras

Portable Hard disk drives

Typical Application Circuit

Efficiency vs. Output Current

(V_OUT= 1.8V)

30008401

FIGURE 1. Typical Application Circuit

30008487

300084

www.national.com

12 3 4 5 6 7...20

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与LM3677相关器件

型号	品牌	获取价格	描述	数据表
LM3677_08	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677_0810	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677_15	TI	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677LE-1.2	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677LE-1.2/NOPB	NSC	获取价格	IC 1.375 A SWITCHING CONTROLLER, 3500 kHz SWITCHING FREQ-MAX, PDSO6, 0.50 MM PITCH, LEAD F
LM3677LE-1.5	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677LE-1.8	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677LE-1.82	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677LEE-1.2	NSC	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3677LEE-1.2/NOPB	TI	获取价格	3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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