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LTC3527EUD-1-PBF PDF预览

LTC3527EUD-1-PBF

更新时间： 2024-09-12 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 481K
描述
Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

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中文翻译

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LTC3527EUD-1-PBF 数据手册

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LTC3527/LTC3527-1  
Dual 800mA/400mA,  
1.2MHz/2.2MHz Synchronous  
Step-Up DC/DC Converters  
DESCRIPTION  
FEATURES  
The LTC®3527/LTC3527-1 are dual high efficiency,  
step-up DC/DC converters in a space saving 16-lead 3mm  
× 3mm QFN package. Battery life is maximized with a  
700mV start-up voltage and operation down to 500mV  
once started. The SHDN and PGOOD pins enable the  
converters to be sequenced or started together.  
■
Dual Synchronous Step-Up DC/DC Converters  
■
Delivers 3.3V at 200mA/100mA from one Alkaline/  
NiMH Cell, or 3.3V at 400mA/200mA from Two Cells  
■
V Start-Up Voltage: 700mV  
IN  
■
0.5V to 5V V Range after Start-Up  
IN  
■
1.6V to 5.25V V  
Range  
OUT  
■
■
■
■
■
■
■
■
■
■
Output Disconnect in Shutdown  
TheLTC3527/LTC3527-1limitinrushcurrentduring start-  
up. Selectable 1.2MHz or 2.2MHz operation provides a  
choice between the highest efficiency or smallest solu-  
tion footprint. The current mode PWM design is internally  
compensated reducing external parts count. Burst Mode  
operationorfixedfrequencyoperationisselectableviathe  
MODEpin.Anti-ringcircuitryreducesEMIindiscontinuous  
mode. This device also features thermal shutdown.  
V > V  
Operation  
IN  
OUT  
1.2MHz or 2.2MHz Operation  
Up to 94% Efficiency  
12µA Quiescent Current in Burst Mode® Operation  
Inrush Current Limiting and Soft-Start  
Internal Synchronous Rectifiers  
Logic-Controlled Shutdown (< 2µA)  
Quick V  
Discharge (LTC3527-1)  
OUT  
True output disconnect allows the output to be completely  
open in shutdown. The LTC3527-1 actively discharges  
16-Lead, 0.75mm × 3mm × 3mm QFN Package  
V
or V  
when its respective SHDN goes low. Qui-  
OUT1  
OUT2  
APPLICATIONS  
escent current in shutdown is less than 2µA.  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
■
MP3/Personal Media Players  
■
Noise Canceling/Bluetooth Headsets  
■
Wireless Mice  
Portable Medical Instruments  
■
TYPICAL APPLICATION  
Two-Cell Alkaline to 3.3V/1.8V Synchronous Boost Converters  
1.2MHz Efficiency and Power Loss  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
1.6V to 3.2V  
BURST  
+
EFFICIENCY  
V
IN  
4.7µF  
100  
10  
4.7µH  
4.7µH  
V
V
V
IN2  
IN1  
IN  
V
V
OUT  
1.8V  
150mA  
SW1  
OUT1  
SW2  
OUT2  
OUT  
V
V
FIXED  
FREQUENCY  
3.3V  
150mA  
619k  
1.78M  
LTC3527  
1
4.7µF  
FB1  
FB2  
POWER  
LOSS  
1.21M  
0.1  
0.01  
1M  
PGOOD1  
SHDN1  
PGOOD2  
SHDN2  
ON  
ON  
V
V
= 2.4V  
OUT1  
IN  
4.7µF  
= 3.3V  
BURST  
OFF  
MODE GND  
F
SEL  
0.01  
0.1  
1
10  
100  
1000  
LOAD CURRENT (mA)  
35271 TA01b  
35271 TA01  
OFF  
35271f  
1
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中文翻译

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