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LTC3539 PDF预览

LTC3539

更新时间: 2024-11-13 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
14页 189K
描述
2A、1MHz / 2MHz 同步升压型 DC/DC 转换器

LTC3539 数据手册

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LTC3539/LTC3539-2  
2A, 1MHz/2MHz  
Synchronous Step-Up  
DC/DC Converters  
FEATURES  
DESCRIPTION  
The LTC®3539/LTC3539-2 are synchronous, 2A step-up  
DC/DC converters with output disconnect. Synchronous  
rectification enables high efficiency in the low profile  
2mm × 3mm DFN package. Battery life is extended with  
a 700mV start-up voltage and operation down to 500mV  
once started.  
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Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells  
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Delivers 5V at 900mA From a Lithium-Polymer  
Battery  
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V Start-Up Voltage: 700mV  
IN  
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1.5V to 5.25V V  
Range  
OUT  
n
n
n
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Up to 94% Efficiency  
V > V Operation  
IN  
OUT  
A switching frequency of 1MHz (LTC3539) or 2MHz  
(LTC3539-2) minimizes solution footprint 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 LTC3539/LTC3539-2  
feature a pin-enabled automatic Burst Mode operation at  
light load conditions. Anti-ring circuitry reduces EMI by  
damping the inductor in discontinuous mode. Additional  
features include a low shutdown current of under 1µA and  
thermal overload protection.  
1.5ꢀ Feedback Voltage Tolerance  
1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed  
Frequency Operation  
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n
n
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Output Disconnect  
Selectable Burst Mode® or PWM Operation  
10µA Quiescent Current  
Logic Controlled Shutdown: <1µA  
Requires Only 6 External Components  
Low Profile (2mm × 3mm × 0.75mm) DFN Package  
APPLICATIONS  
The LTC3539/LTC3539-2 are offered in a 2mm × 3mm ×  
0.75mm DFN package.  
L, LT, LTC, LTM and Burst Mode are registered trademarks and ThinSOT is a trademark of  
Linear Technology Corporation. All other trademarks are the property of their respective owners.  
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Medical Instruments  
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Portable Bar Code Scanners  
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Noise Canceling Headphones  
Portable GPS Navigation  
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Handheld PCs  
TYPICAL APPLICATION  
Wide VIN, High Power 3.3V Regulator  
Efficiency and Power Loss vs Load Current  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
4.7µH  
V
IN  
1.8V TO 3.6V  
EFFICIENCY  
2.2µF  
V
SW  
IN  
LTC3539  
V
V
= 2.4V  
V
IN  
OUT  
OUT  
PWM BURST  
OFF ON  
MODE  
V
OUT  
= 3.3V  
3.3V  
600mA  
1M  
33pF  
POWER LOSS  
SHDN  
FB  
22µF  
×2  
1
GND PGND  
562k  
FREQUENCY = 1MHz  
FREQUENCY = 2MHz  
3539 TA01a  
0.1  
1000  
0.1  
1
10  
100  
I
AVERAGE (mA)  
3539 TA01b  
LOAD  
35392fc  
1
For more information www.linear.com/3539/3539-2  

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