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LTC3499

更新时间： 2024-11-19 05:43:55
品牌 Logo 应用领域
凌特 - Linear 转换器电池
页数 文件大小 规格书
16页 247K
描述
750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

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中文翻译

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LTC3499 数据手册

 浏览型号LTC3499的Datasheet PDF文件第2页浏览型号LTC3499的Datasheet PDF文件第3页浏览型号LTC3499的Datasheet PDF文件第4页浏览型号LTC3499的Datasheet PDF文件第5页浏览型号LTC3499的Datasheet PDF文件第6页浏览型号LTC3499的Datasheet PDF文件第7页 
LTC3499/LTC3499B  
750mA Synchronous  
Step-Up DC/DC Converters  
with Reverse-Battery Protection  
U
FEATURES  
DESCRIPTIO  
The LTC®3499/LTC3499B are synchronous, fixed fre-  
quency step-up DC/DC power converters with integrated  
reverse battery protection that protect and disconnect the  
devicesandloadwhenthebatterypolarityisreversedwhile  
delivering high efficiency in a small (3mm × 3mm) DFN  
package.Trueoutputdisconnecteliminatesinrushcurrent  
and allows zero load current in shutdown.  
■
Reverse-Battery Protection for DC/DC Converter  
and Load  
■
High Efficiency: Up to 94%  
■
Generates 5V at 175mA from a 1.8V Input  
■
Operates from 1.8V to 5.5V Input Supply  
■
2V to 6V Adjustable Output Voltage  
■
Inrush Current Controlled During Start-Up  
■
Output Disconnnect in Shutdown  
The devices feature an input voltage range of 1.8V to 5.5V  
enabling operation from two alkaline or NiMH batteries.  
The switching frequency is internally set at 1.2MHz allow-  
ingtheuseoftinysurfacemountinductorsandcapacitors.  
A minimal number of external components are required to  
generate output voltages ranging from 2V to 6V. The  
LTC3499 features automatic Burst Mode operation to  
increase efficiency at light loads, while the LTC3499B  
features continuous switching at light loads.  
■
Low Noise 1.2MHz PWM Operation  
■
Tiny External Components  
Automatic Burst Mode® Operation (LTC3499)  
■
■
Continuous Switching at Light Loads (LTC3499B)  
Overvoltage Protection  
8-Lead (3mm × 3mm × 0.75mm) DFN  
■
■
and MSOP Packages  
U
APPLICATIO S  
The soft-start time is externally programmable through a  
smallcapacitor.Anti-ringcircuitryreducesEMIemissions  
by damping the inductor in discontinuous mode. The  
devicesfeature<1µAshutdownsupplycurrent, integrated  
overvoltage protection and are available in both 8-pin  
(3mm × 3mm) DFN and 8-pin MSOP packages.  
■
Medical Equipment  
■
Digital Cameras  
■
MP3 Players  
Handheld Instruments  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
Battery Current vs V  
IN  
Two AA Cells to 5V Synchronous Boost Converter  
1.0  
0.5  
SHDN = 0V  
= 0V  
V
OUT  
4.7µH  
V
IN  
1.8V TO 3.2V  
+
V
2.2µF  
SW  
OUT  
FB  
IN  
LTC3499  
V
OUT  
0
V
5V  
ON OFF  
SHDN  
VC  
175mA  
1M  
10µF  
–0.5  
–1.0  
100k  
330pF  
SS  
GND  
324k  
0.01µF  
–6  
–4  
–2  
0
2
4
6
3499 TA01  
V
AND SW VOLTAGE (V)  
IN  
3499 TA01b  
3499f  
1
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