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LTC1475

更新时间： 2024-11-12 22:57:35
品牌 Logo 应用领域
凌特 - Linear 转换器
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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LTC1475 数据手册

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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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