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LTC3539-2 PDF预览

LTC3539-2

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
12页 171K
描述
2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters

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中文翻译

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LTC3539-2 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.  
n
Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells  
n
Delivers 5V at 900mA From a Lithium-Polymer  
Battery  
n
V Start-Up Voltage: 700mV  
IN  
n
1.5V to 5.25V V  
Range  
OUT  
n
n
n
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.  
1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed  
Frequency Operation  
n
n
n
n
n
n
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 of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
Medical Instruments  
n
Portable Bar Code Scanners  
n
Noise Canceling Headphones  
Portable GPS Navigation  
Handheld PCs  
n
n
TYPICAL APPLICATION  
Wide VIN, High Power 3.3V Regulator  
Efficiency and Power Loss vs  
Load Current  
4.7μH  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
V
IN  
1.8V TO 3.6V  
2.2μF  
EFFICIENCY  
V
SW  
IN  
LTC3539  
V
OUT  
PWM BURST  
OFF ON  
MODE  
V
OUT  
3.3V  
V
V
= 2.4V  
IN  
OUT  
600mA  
1M  
22pF  
= 3.3V  
POWER LOSS  
SHDN  
FB  
22μF  
GND PGND  
562k  
1
3539 TA01a  
FREQUENCY = 1MHz  
FREQUENCY = 2MHz  
0.1  
1000  
0.1  
1
10  
100  
I
AVERAGE (mA)  
LOAD  
3539 TA01b  
3539f  
1
1234567...12

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