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LTC1474IS8-5

更新时间： 2024-11-12 22:57:35
品牌 Logo 应用领域
凌特 - Linear 转换器稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
20页 353K
描述
Low Quiescent Current High Efficiency Step-Down Converters

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中文翻译

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LTC1474IS8-5 技术参数

是否Rohs认证：不符合生命周期：Transferred
零件包装代码：SOIC包装说明：SOP, SOP8,.25
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.06Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：18 V
最小输入电压：3 V标称输入电压：10 V
JESD-30 代码：R-PDSO-G8JESD-609代码：e0
长度：4.9 mm湿度敏感等级：1
功能数量：1端子数量：8
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：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：235认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK
技术：CMOS温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：3.9 mm
Base Number Matches：1

LTC1474IS8-5 数据手册

 浏览型号LTC1474IS8-5的Datasheet PDF文件第2页浏览型号LTC1474IS8-5的Datasheet PDF文件第3页浏览型号LTC1474IS8-5的Datasheet PDF文件第4页浏览型号LTC1474IS8-5的Datasheet PDF文件第5页浏览型号LTC1474IS8-5的Datasheet PDF文件第6页浏览型号LTC1474IS8-5的Datasheet PDF文件第7页 
LTC1474/LTC1475  
Low Quiescent Current  
High Efficiency Step-Down  
Converters  
U
FEATURES  
DESCRIPTION  
The LTC®1474/LTC1475 series are high efficiency step-  
down converters with internal P-channel MOSFET power  
switches that draw only 10µA typical DC supply current at  
no load while maintaining output voltage. The LTC1474  
uses logic-controlled shutdown while the LTC1475 fea-  
tures pushbutton on/off.  
■
High Efficiency: Over 92% Possible  
Very Low Standby Current: 10µA Typ  
■
■
■
■
■
■
■
Available in Space Saving 8-Lead MSOP Package  
Internal 1.4Ω Power Switch (VIN = 10V)  
Wide VIN Range: 3V to 18V Operation  
Very Low Dropout Operation: 100% Duty Cycle  
Low-Battery Detector Functional During Shutdown  
Programmable Current Limit with Optional  
Current Sense Resistor (10mA to 400mA Typ)  
Short-Circuit Protection  
The low supply current coupled with Burst ModeTM opera-  
tion enables the LTC1474/LTC1475 to maintain high effi-  
ciency over a wide range of loads. These features, along  
with their capability of 100% duty cycle for low dropout  
andwideinputsupplyrange, maketheLTC1474/LTC1475  
idealformoderatecurrent(upto300mA)battery-powered  
applications.  
■
■
■
■
■
Few External Components Required  
Active Low Micropower Shutdown: IQ = 6µA Typ  
Pushbutton On/Off (LTC1475 Only)  
3.3V, 5V and Adjustable Output Versions  
The peak switch current is user-programmable with an  
optionalsenseresistor(defaultsto325mAminimumifnot  
used) providing a simple means for optimizing the design  
for lower current applications. The peak current control  
also provides short-circuit protection and excellent start-  
upbehavior.Alow-batterydetectorthatremainsfunctional  
in shutdown is provided .  
U
APPLICATIONS  
■
Cellular Telephones and Wireless Modems  
4mA to 20mA Current Loop Step-Down Converter  
Portable Instruments  
Battery-Operated Digital Devices  
Battery Chargers  
Inverting Converters  
Intrinsic Safety Applications  
■
■
■
■
The LTC1474/LTC1475 series availability in 8-lead MSOP  
and SO packages and need for few additional components  
provide for a minimum area solution.  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
LTC1474 Efficiency  
100  
V
IN  
LOW BATTERY OUT  
4V TO 18V  
V
IN  
= 5V  
+
90  
80  
70  
60  
50  
10µF  
25V  
V
IN  
= 10V  
0.1µF  
7
V
IN  
1
2
6
3
V
OUT  
SENSE  
V
V
IN  
= 15V  
FB  
3.3V AT 250mA  
LTC1474-3.3  
+
L1  
100µH  
LBI  
LBO  
SW  
LOW BATTERY IN  
RUN SHDN  
100µF  
6.3V  
100k  
8
5
RUN  
GND  
4
D1  
MBR0530  
L = 100µH  
V
R
= 3.3V  
OUT  
SENSE  
1474/75 F01  
= 0Ω  
L1 = SUMIDA CDRH74-101  
0.03  
0.3  
3
30  
300  
Figure 1. High Efficiency Step-Down Converter  
LOAD CURRENT (mA)  
1474/75 TA01  
1
1234567...20

中文翻译

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