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LTC3523-2_15 PDF预览

LTC3523-2_15

更新时间： 2024-11-13 01:11:19
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 263K
描述
Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters

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中文翻译

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LTC3523-2_15 数据手册

 浏览型号LTC3523-2_15的Datasheet PDF文件第2页浏览型号LTC3523-2_15的Datasheet PDF文件第3页浏览型号LTC3523-2_15的Datasheet PDF文件第4页浏览型号LTC3523-2_15的Datasheet PDF文件第5页浏览型号LTC3523-2_15的Datasheet PDF文件第6页浏览型号LTC3523-2_15的Datasheet PDF文件第7页 
LTC3523/LTC3523-2  
Synchronous 600mA Step-Up  
and 400mA Step-Down  
DC/DC Converters  
FEATURES  
DESCRIPTION  
The LTC®3523/LTC3523-2 combine a 600mA step-up  
DC/DC converter with a 400mA synchronous step-down  
DC/DC converter in a tiny 3mm × 3mm package. The  
1.2MHz/2.4MHz switching frequencies minimize the  
solution footprint while maintaining high efficiency. Both  
converters feature soft-start and internal compensation,  
simplifying the design.  
n
Dual High Efficiency DC/DC Converters:  
Step-Up (V  
= 1.8V to 5.25V, I = 600mA)  
OUT  
SW  
Step-Down (V  
= 0.615V to 5.5V, I  
= 400mA)  
OUT  
OUT  
n
n
n
n
n
1.8V to 5.5V Input Voltage Range  
Up to 94% Efficiency  
Pin Selectable Burst Mode® Operation  
45μA Quiescent Current in Burst Mode Operation  
1.2MHz (LTC3523) or 2.4MHz (LTC3523-2)  
Switching Frequency  
Both the step-up and step-down converters are current  
mode controlled and utilize an internal synchronous rec-  
tifier for high efficiency. The step-up supports 0% duty  
cycle operation and the step-down converter supports  
100% duty cycle operation to extend battery run time.  
If the MODE pin is held high, both converters automati-  
cally transition between Burst Mode operation and PWM  
operation improving light load efficiency. Fixed, low noise  
1.2MHz/2.4MHz PWM operation is selected when MODE  
is grounded.  
n
n
n
n
n
Independent Power Good Indicator Outputs  
Integrated Soft-Start  
Thermal and Overcurrent Protection  
<3μA Quiescent Current in Shutdown  
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package  
APPLICATIONS  
n
Digital Cameras  
The LTC3523/LTC3523-2 provide a sub-3μA shutdown  
mode, overtemperature shutdown and current limit pro-  
tection on both converters. The LTC3523/LTC3523-2 are  
housedina16-lead3mm×3mm×0.75mmQFNpackage.  
n
Medical Instruments  
n
Industrial Handhelds  
GPS Navigators  
n
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
LTC3523 Efficiency and Power  
Loss vs Load Current  
V
IN  
1.8V TO 3.2V  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
+
2-CELL  
ALKALINE  
47μF  
4.7μH  
V
OUT2  
V
V
V
BAT  
IN1  
IN2  
4.7μH  
V
STEP-DOWN  
OUTPUT  
1.2V  
10μF  
EFFICIENCY  
SW1  
V
SW2  
FB2  
V
OUT1  
10pF  
511k  
511k  
STEP-UP  
OUTPUT  
3.3V  
200mA  
P0WER LOSS  
OUT  
LTC3523  
FB1  
MODE  
634k  
IN  
10μF  
200mA  
V
V
V
= 2.4V  
PGOOD1  
SHDN1  
PGOOD2  
SHDN2  
IN  
= 3.3V  
= 1.2V  
OUT1  
OUT2  
365k  
1
GND1 GND2 GND3  
f
= 1.2MHz  
OSC  
STEP-UP  
STEP-DOWN  
100  
OFF ON  
OFF ON  
3523 TA01a  
0.1  
0.1  
1
10  
1000  
LOAD CURRENT (mA)  
3523 TA01b  
3523fb  
1
1234567...16

中文翻译

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