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LTC3402

更新时间： 2023-12-20 18:44:32
品牌 Logo 应用领域
亚德诺 - ADI 升压转换器
页数 文件大小 规格书
16页 229K
描述
2A、3MHz 微功率同步升压转换器

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中文翻译

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LTC3402 数据手册

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LTC3402  
2A, 3MHz Micropower  
Synchronous Boost Converter  
U
FEATURES  
DESCRIPTIO  
The LTC®3402 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.  
■
Synchronous Rectification: Up to 97% Efficiency  
2A Switch Current Rating  
Fixed Frequency Operation Up to 3MHz  
■
■
■
Wide Input Range: 0.5V to 5V  
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 MSUOP Package  
■
Other features include a 1μA shutdown, antiringing con-  
trol, open-drain power good output, thermal shutdown  
and current limit. The LTC3402 is available in the 10-lead  
thermally enhanced MSOP package. Lower current appli-  
cations should use the 1A rated LTC3401 synchronous  
boost converter. Applications that require VOUT < 2.6V  
should use the LTC3424.  
APPLICATIO S  
■
Cellular Telephones  
Handheld Computers  
MP3 Players  
2-Way Pagers  
GPS Receivers  
Battery Backup Supplies  
■
■
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.  
■
■
■
CCFL Backlights  
U
TYPICAL APPLICATIO  
All Ceramic Capacitor 2-Cell to 3.3V at 1A Step-Up Converter  
Efficiency  
L1  
100  
Burst Mode  
2.2μH  
V
3.3V  
1A  
V
= 1.8V to 3V  
OUT  
IN  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
OPERATION  
1MHz  
CONSTANT  
FREQUENCY  
LTC3402  
3
10  
2
4
7
8
9
5
R2  
V
SW  
OUT  
IN  
909k  
SHDN  
V
+
2
C2  
CELLS  
MODE/SYNC FB  
44μF  
(2 × 22μF)  
6
PGOOD  
V
C
C3  
R1  
549k  
C1  
10μF  
1
470pF  
R
GND  
t
V
IN  
= 2.4V WITH SCHOTTKY  
C4  
4.7pF  
R
30.1k  
R5  
82k  
t
0.1  
100  
1000  
1
10  
(mA)  
I
OUT  
3402 TA02  
C1: TAIYO YUDEN JMK212BJ106MG  
C2: TAIYO YUDEN JMK325BJ226MM  
L1: COILCRAFT: D03316P-222  
3402 TA01  
0 = FIXED FREQ  
1 = Burst Mode OPERATION  
3402fb  
1
1234567...16

中文翻译

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