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LTC3443

更新时间： 2023-12-20 18:44:58
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
16页 227K
描述
高电流、微功率、600kHz 同步降压-升压型 DC/DC 转换器

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中文翻译

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LTC3443 数据手册

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LTC3443  
High Current Micropower  
600kHz Synchronous Buck-Boost  
DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
The LTC®3443 is a high efficiency, fixed frequency, buck-  
■
Regulated Output with Input Above, Below or Equal  
to the Output  
boost DC/DC converter that operates from input voltages  
above, below or equal to the output voltage. The part is pin  
forpincompatiblewithitspredecessor,theLTC3441,with  
a lower operating frequency (600kHz), and a VC pin clamp  
circuit during Burst Mode operation. The topology incor-  
porated in the IC provides a continuous transfer function  
through all operating modes, making the product ideal for  
single Lithium Ion or multicell applications where the out-  
put voltage is within the battery voltage range.  
■
■
■
■
Single Inductor, No Schottky Diodes  
High Efficiency: Up to 96%  
28μA Quiescent Current in Burst Mode® Operation  
Up to 1.2A Continuous Output Current from a Single  
Lithium-Ion  
■
■
■
■
■
■
■
■
True Output Disconnect in Shutdown  
2.4V to 5.5V Input Range  
2.4V to 5.25V Output Range  
The device includes two 0.10Ω N-channel MOSFET  
switches and two 0.11Ω P-channel switches. External  
Schottky diodes are optional, and can be used for a  
moderateefficiencyimprovement.Theoperatingfrequency  
is internally set to 600kHz and can be synchronized up to  
1.2MHz. Quiescent current is only 28μA in Burst Mode  
operation, maximizingbatterylifeinportableapplications.  
Burst Mode operation is user controlled and can be  
enabled by driving the MODE/SYNC pin high. If the MODE/  
SYNC pin is driven low or with a clock, then fixed fre-  
quency switching is enabled.  
600kHz Fixed Frequency Operation  
Synchronizable Oscillator  
Selectable Burst Mode or Fixed Frequency Operation  
<1μA Quiescent Current in Shutdown  
Small, Thermally Enhanced 12-Lead  
(4mm × 3mm × 0.8mm) DFN package  
U
APPLICATIO S  
■
Handheld Computers  
Handheld Instruments  
MP3 Players  
Digital Cameras  
■
■
Other features include a 1μA shutdown, soft-start control,  
thermal shutdown and current limit. The LTC3443 is  
available in a thermally enhanced 12-lead (4mm × 3mm)  
DFN Package.  
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
U.S. Patent #’s 6404251, 6166527  
U
TYPICAL APPLICATIO  
Efficiency vs V  
IN  
Li-Ion to 3.3V at 1A Buck-Boost Converter  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
6μH  
I
= 200mA  
V
3.3V  
1A  
OUT  
OUT  
220pF  
SW1  
SW2  
340k  
200k  
I
= 1A  
OUT  
PV  
V
V
OUT  
IN  
V
IN  
2.2k  
LTC3443  
2.5V  
FB  
44μF  
(2 × 22μF)  
IN  
15k  
TO 4.2V  
SHDN/SS  
MODE/SYNC GND  
PGND PGND  
V
C
560pF  
Li-Ion  
10μF  
V
= 3.3V  
3.2  
OUT  
3443 TA01  
2.7  
4.2  
(V)  
4.7  
5.2  
3443 TA02  
3.7  
V
IN  
3443fa  
1
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