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LTC3442

更新时间： 2024-09-26 14:57:59
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
20页 559K
描述
具有自动突发模式操作的微功率同步降压-升压 DC/DC 转换器

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中文翻译

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LTC3442 数据手册

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LTC3442  
Micropower Synchronous  
Buck-Boost DC/DC Converter with  
Automatic Burst Mode Operation  
DESCRIPTION  
FEATURES  
The LTC®3442 is a highly efficient, fixed frequency, buck-  
boost DC/DC converter, which operates from input volt-  
ages above, below, and equal to the output voltage. The  
n
Regulated Output with Input Voltages Above,  
Below, or Equal to the Output  
Single Inductor, No Schottky Diodes Required  
n
Manual or Programmable Automatic Burst Mode®  
Operation  
Programmable Average Input Current Limit  
Up to 1.2A Continuous Output Current from a Single  
Lithium-Ion Cell  
topology incorporated in the IC provides a continuous  
transfer function through all operating modes, making the  
product ideal for a single lithium-ion or multicell alkaline  
applications where the output voltage is within the battery  
voltage range.  
n
n
n
n
n
n
n
n
n
n
n
High Efficiency: Up to 95%  
The device includes two 0.10Ω N-channel MOSFET  
switches and two 0.10Ω P-channel switches. Operating  
frequency and average input current limit can each be  
programmed with an external resistor. Quiescent current  
is only 35µA in Burst Mode operation, maximizing battery  
life in portable applications. Automatic Burst Mode opera-  
tion allows the user to program the load current for Burst  
Mode operation, or to control it manually.  
Output Disconnect in Shutdown  
2.4V to 5.5V Input Range  
2.4V to 5.25V Output Range  
35µA Quiescent Current in Burst Mode Operation  
Programmable Frequency from 300kHz to 2MHz  
<1µA Shutdown Current  
Small, Thermally Enhanced 12-Lead (4mm × 3mm)  
DFN Package  
Other features include 1µA shutdown current, program-  
mablesoft-start,peakcurrentlimitandthermalshutdown.  
The LTC3442 is available in a low profile, thermally en-  
hanced 12-lead (4mm × 3mm × 0.75mm) DFN package.  
L, LT, LTC, LTM, Linear Technology, the Linear logo 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. Protected by U.S. Patents, including 6404251, 6166527.  
APPLICATIONS  
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PDA/‘SMART’ Phones  
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Handheld Computers  
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MP3 Players  
Handheld Instruments  
Digital Cameras  
Wireless Handsets  
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n
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USB Peripherals  
TYPICAL APPLICATION  
Efficiency vs VIN  
100  
4.7µH  
300mA LOAD  
90  
SW1  
SW2  
V
V
IN  
OUT  
1A LOAD  
2.5V TO  
4.2V  
V
IN  
V
OUT  
3.3V  
1.2A  
80  
340k  
1M  
2.2k  
LTC3442  
SHDN/SS  
FB  
70  
0.01µF  
Li-Ion  
10µF  
22µF  
15k  
R
R
V
C
LIM  
220pF  
470pF  
60  
V
= 3.3V  
OUT  
L = 4.7µH  
BURST  
PGND  
T
F = 600kHz  
0.01µF  
50  
SGND  
200k  
71.5k  
200k  
2.5  
3.5  
4.0  
(V)  
4.5  
5.0  
5.5  
3.0  
V
IN  
3442 • TA01b  
3442 TA01a  
3442fb  
1
For more information www.linear.com/LTC3442  
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