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LM3670MF-1.875 PDF预览

LM3670MF-1.875

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

LM3670MF-1.875 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:SOT-23, 5 PINReach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.14其他特性:AUTOMATIC PFM/PWM MODE SWITCHING
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:VOLTAGE-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:5.5 V
最小输入电压:2.5 V标称输入电压:3.6 V
JESD-30 代码:R-PDSO-G5JESD-609代码:e0
长度:2.92 mm湿度敏感等级:1
功能数量:1端子数量:5
最高工作温度:85 °C最低工作温度:-40 °C
最大输出电流:0.75 A封装主体材料:PLASTIC/EPOXY
封装代码:LSSOP封装等效代码:TSOP5/6,.11,37
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:1.22 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BUCK
最大切换频率:1300 kHz温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:0.953 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:1.6 mm
Base Number Matches:1

LM3670MF-1.875 数据手册

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December 2004  
LM3670  
Miniature Step-Down DC-DC Converter for Ultra Low  
Voltage Circuits  
General Description  
Features  
n VOUT = adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V  
n 2.5V VIN 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  
© 2004 National Semiconductor Corporation  
DS200758  
www.national.com  

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