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LTC3444

更新时间： 2024-09-24 05:43:51
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
20页 201K
描述
Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

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中文翻译

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LTC3444 数据手册

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LTC3444  
Micropower Synchronous  
Buck-Boost DC/DC Converter  
for WCDMA Applications  
U
FEATURES  
DESCRIPTIO  
■
Optimized Features for WCDMA Handsets  
The LTC®3444 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  
topology incorporated in the IC provides a continuous  
transferfunctionthroughalloperatingmodes, makingthe  
product ideal for a single Lithium-Ion or multi-cell  
applicationswheretheoutputvoltagecanvaryoverawide  
range.  
■
Regulated Output with Input Voltages  
Above, Below, or Equal to the Output  
■
0.5V to 5V Output Range  
■
Up to 400mA Continuous Output Current From  
a Single Lithium-Ion Cell  
■
Minimal External Components  
■
1.5MHz Fixed Frequency Operation  
■
Internal Loop Compensation for Fast Response  
The LTC3444 has been optimized for use in 3G WCDMA  
applications. A unique design yields high efficiency at  
very low output voltages while also eliminating external  
components. The high speed error amplifier provides the  
fast transient response required to slew the RF power  
amplifier from standby to transmit and transmit to stand  
by power levels. Output overvoltage protection protects  
the RF power amplifier.  
<25μs Full Scale Output Slewing; COUT 4.7μF  
■
Output Disconnect in Shutdown  
■
2.75V to 5.5V Input  
■
<1μA Shutdown Current  
■
Internal Soft-Start  
■
Output Overvoltage Protection  
■
Single Inductor, No Schottky Diodes Required  
■
Small, Thermally Enhanced 8-Lead (3mm × 3mm)  
DFN Package  
Operating frequency is internally set to 1.5MHz to mini-  
mizeexternalcomponentsizewhilemaximizingefficiency.  
U
Other features include <1μA shutdown current, internal  
soft-start, peak current limit and thermal shutdown. The  
LTC3444 is available in a small, thermally enhanced  
8-lead (3mm × 3mm) DFN package.  
APPLICATIO S  
■
WCDMA Applications–3G Handsets with High Speed  
Data Rate Capability  
■
MP3 Players  
Digital Cameras  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 6404251, 6166527.  
■
U
TYPICAL APPLICATIO  
2.2μH  
V
LTC3444 Dynamic Response  
OUT  
0.8V TO 4.2V  
LTC3444  
340k  
SW1  
SW2  
3.1V TO 4.2V  
V
IN  
V
OUT  
4.7μF  
V
OUT  
CONTROL  
SHDN  
GND  
FB  
V
4.7μF  
+
V
C
205k  
Li-Ion  
267k  
10μs/DIV  
V
V
= 3.6V, V  
CONTROL  
= 0.8V TO 4.2V  
OUT  
IN  
= 2.36V TO 0.28V, I  
= 100mA  
LOAD  
V
CONTROL  
DAC  
3444 G16a  
3444 TA01  
3444fb  
1
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