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LTC3642

更新时间： 2024-11-23 05:43:55
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
20页 275K
描述
High Effi ciency, High Voltage 50mA Synchronous Step-Down Converter

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中文翻译

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LTC3642 数据手册

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LTC3642  
High Efficiency, High Voltage  
50mA Synchronous  
Step-Down Converter  
FEATURES  
DESCRIPTION  
The LTC®3642 is a high efficiency step-down DC/DC  
converter with internal high side and synchronous power  
switches that draws only 12μA typical DC supply current  
at no load while maintaining output voltage regulation.  
n
Wide Input Voltage Range: 4.5V to 45V  
n
Tolerant of 60V Input Transients  
n
Internal High Side and Low Side Power Switches  
n
No Compensation Required  
50mA Output Current  
n
The LTC3642 can supply up to 50mA load current and  
features a programmable peak current limit that provides  
a simple method for optimizing efficiency in lower current  
applications. The LTC3642’s combination of Burst Mode®  
operation, integrated power switches, low quiescent cur-  
rent, and programmable peak current limit provides high  
efficiency over a broad range of load currents.  
n
Low Dropout Operation: 100% Duty Cycle  
n
Low Quiescent Current: 12μA  
n
0.8V Feedback Voltage Reference  
n
Adjustable Peak Current Limit  
n
Internal and External Soft-Start  
n
Precise RUN Pin Threshold with Adjustable  
Hysteresis  
n
n
With its wide 4.5V to 45V input range and internal  
overvoltagemonitorcapableofprotectingthepartthrough  
60V surges, the LTC3642 is a robust converter suited for  
regulating a wide variety of power sources. Additionally,  
theLTC3642includesapreciserunthresholdandsoft-start  
feature to guarantee that the power system start-up is  
well-controlled in any environment.  
3.3V, 5V and Adjustable Output Versions  
Only Three External Components Required for Fixed  
Output Versions  
n
Low Profile (0.75mm) 3mm × 3mm DFN and  
Thermally-Enhanced MS8E Packages  
APPLICATIONS  
The LTC3642 is available in the thermally enhanced  
3mm × 3mm DFN and MS8E packages.  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
4mA to 20mA Current Loops  
n
Industrial Control Supplies  
n
Distributed Power Systems  
n
Portable Instruments  
n
Battery-Operated Devices  
n
Automotive Power Systems  
Efficiency and Power Loss vs Load Current  
TYPICAL APPLICATION  
100  
V
= 10V  
IN  
95  
90  
85  
80  
75  
70  
65  
100  
10  
1
5V, 50mA Step-Down Converter  
EFFICIENCY  
150ꢀH  
V
OUT  
V
IN  
V
SW  
5V  
IN  
5V TO 45V  
1ꢀF  
50mA  
LTC3642-5  
10ꢀF  
POWER LOSS  
RUN  
HYST  
V
OUT  
SS  
I
SET  
GND  
3642 TA01a  
0.1  
100  
0.1  
1
10  
LOAD CURRENT (mA)  
3642 TA01b  
3642f  
1
1234567...20

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