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LTC3535EDD-TRPBF

更新时间： 2024-09-24 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
16页 248K
描述
Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter

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中文翻译

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LTC3535EDD-TRPBF 数据手册

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LTC3535  
Dual Channel 550mA 1MHz  
Synchronous Step-Up  
DC/DC Converter  
DESCRIPTION  
The LTC®3535 is a dual channel, synchronous, fixed fre-  
quency step-up DC/DC converter with output disconnect.  
Extended battery life in single AA/AAA powered products  
is realized with a 680mV start-up voltage and operation  
down to 500mV once started.  
FEATURES  
n
Two Independent Step-Up Converters  
n
Each Channel Delivers 3.3V at 100mA from a Single  
Alkaline/NiMH Cell or 3.3V at 200mA from Two Cells  
n
V Start-Up Voltage: 680mV  
IN  
n
1.5V to 5.25V V  
Range  
OUT  
n
n
n
n
n
n
n
n
n
n
n
Up to 94% Efficiency  
A switching frequency of 1MHz minimizes solution foot-  
print by allowing the use of tiny, low profile inductors  
and ceramic capacitors. The current mode PWM design  
is internally compensated, reducing external parts count.  
The LTC3535 features Burst Mode operation at light load  
conditions allowing it to maintain high efficiency over a  
wide range of load. Anti-ring circuitry reduces EMI by  
damping the inductor in discontinuous mode. Additional  
features include a low shutdown current of under 1μA and  
thermal shutdown.  
Output Disconnect  
1MHz Fixed Frequency Operation  
V > V  
Operation  
IN  
OUT  
Integrated Soft-Start  
Current Mode Control with Internal Compensation  
Burst Mode® Operation with 9μA I Each Channel  
Q
Internal Synchronous Rectifier  
Logic Controlled Shutdown (I < 1μA)  
Q
Anti-Ring Control  
Low Profile (3mm × 3mm × 0.75mm)  
12-Lead DFN Package  
The LTC3535 is housed in a 3mm × 3mm × 0.75mm  
DFN package.  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
APPLICATIONS  
n
Medical Instruments  
n
Noise Canceling Headphones  
n
Wireless Mice  
Bluetooth Headsets  
n
TYPICAL APPLICATION  
Efficiency vs Load Current  
4.7μH  
100  
V
SW1  
OUT1  
V
V
= 1.8V  
= 3.3V  
OUT  
OUT  
V
V
V
1.8V  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
IN1  
OUT1  
OUT2  
100mA  
10μF  
OFF ON  
OFF ON  
SHDN1  
V
IN  
511k  
V
0.8V  
OUT2  
10μF  
3.3V  
TO 1.5V  
LTC3535  
50mA  
2.2μF  
V
IN2  
FB1  
FB2  
1.78M  
1M  
SHDN2  
1M  
GND SW2 GND  
4.7μH  
3535 TA01  
V
IN  
= 1.2V  
10  
100  
0.01  
1000  
0.1  
1
LOAD CURRENT (mA)  
3535 TA01b  
3535f  
1
1234567...16

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