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LTC3401

更新时间： 2023-12-20 18:45:22
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 235K
描述
1A、3MHz 微功率同步升压型转换器

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中文翻译

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LTC3401 数据手册

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LTC3401  
1A, 3MHz Micropower  
Synchronous Boost Converter  
U
FEATURES  
DESCRIPTIO  
■
Synchronous Rectification: Up to 97% Efficiency  
1A Switch Current Rating  
Fixed Frequency Operation Up to 3MHz  
The LTC®3401 is a high efficiency, fixed frequency, step-  
up DC/DC converter that operates from an input voltage  
below1V.Thedeviceincludesa0.16ΩN-channelMOSFET  
switch and a 0.18Ω P-channel synchronous rectifier.  
Switching frequencies up to 3MHz are programmed with  
an external timing resistor and the oscillator can be  
synchronized to an external clock. An external Schottky  
diode is optional but will slightly improve efficiency.  
■
■
■
Wide Input Range: 0.5V to 5.5V (Operating)  
Very Low Quiescent Current: 38μA (Burst Mode®  
■
Operation)  
■
2.6V to 5.5V Adjustable Output Voltage  
0.85V (Typ) Start-Up Voltage  
No External Schottky Diode Required (VOUT < 4.3V)  
Synchronizable Switching Frequency  
Burst Mode Enable Control  
Antiringing Control Reduces Switching Noise  
■
■
Quiescent current is only 38μA in Burst Mode operation,  
maximizing battery life in portable applications. Burst  
Mode operation is user controlled and can be enabled by  
driving the MODE/SYNC pin high. If the MODE/SYNC pin  
has either a clock or is driven low, then fixed frequency  
switching is enabled.  
■
■
■
■
PGOOD Output  
OPTI-LOOP® Compensation  
■
■
Very Low Shutdown Current: <1μA  
Small 10-Pin MSOP Package  
■
Other features include 1μA shutdown, antiringing control,  
open-drain power good output, thermal shutdown and  
current limit. The LTC3401 is available in the 10-lead  
thermally enhanced MSOP package. Higher current appli-  
cations should use the 2A rated LTC3402 synchronous  
boost converter. Applications that require VOUT < 2.6V  
should use the LTC3423.  
U
APPLICATIO S  
■
Pagers  
Handheld Instruments  
Cordless Phones  
Wireless Handsets  
GPS Receivers  
Battery Backup  
CCFL Backlights  
■
■
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.  
■
■
■
U
TYPICAL APPLICATION  
All-Ceramic-Capacitor 2-Cell to 3.3V at 500mA Step-Up Converter  
L1  
4.7μH  
V
V
IN  
= 1.8V to 3V  
Efficiency  
OUT  
3.3V  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
500mA  
Burst Mode  
OPERATION  
LTC3401  
3
10  
2
4
7
8
9
5
R2  
V
SW  
OUT  
IN  
909k  
1MHz  
FIXED  
FREQUENCY  
SHDN  
V
+
2
C2  
22μF  
CELLS  
MODE/SYNC FB  
6
PGOOD  
V
C
C3  
470pF  
C1  
4.7μF  
1
R1  
549k  
C4  
4.7pF  
R
GND  
t
R
R5  
82k  
t
30.1k  
V
= 2.4V WITH SCHOTTKY  
IN  
0.1  
100  
1000  
1
10  
(mA)  
3404 TA01  
0 = FIXED FREQUENCY  
1 = Burst Mode OPERATION  
C1: TAIYO YUDEN JMK212BJ475MG  
C2: TAIYO YUDEN JMK325BJ226MM  
L1: SUMIDA CD43-4R7M  
I
OUT  
3401 TA02  
3401fb  
1
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中文翻译

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