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LTC3423 PDF预览

LTC3423

更新时间： 2023-12-20 18:44:47
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
12页 206K
描述
低输出电压、3MHz 微功率同步升压型转换器

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中文翻译

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LTC3423 数据手册

 浏览型号LTC3423的Datasheet PDF文件第2页浏览型号LTC3423的Datasheet PDF文件第3页浏览型号LTC3423的Datasheet PDF文件第4页浏览型号LTC3423的Datasheet PDF文件第5页浏览型号LTC3423的Datasheet PDF文件第6页浏览型号LTC3423的Datasheet PDF文件第7页 
LTC3423/LTC3424  
Low Output Voltage,  
3MHz Micropower Synchronous  
Boost Converters  
U
FEATURES  
DESCRIPTIO  
The LTC®3423 and LTC3424 are high efficiency, fixed  
frequency, step-up DC/DC converters that can regulate  
output voltages as low as 1.5V from a single cell. An  
applied voltage of at least 2.7V to the VDD pin is required  
to power the internal control circuitry.  
■
1.5V to 5.5V Adjustable Output Voltage  
■
Synchronous Rectification: Up to 95% Efficiency  
■
1A Switch Current (LTC3423) or  
2A Switch Current (LTC3424)  
■
Fixed Frequency Operation Up to 3MHz  
■
Wide Input Range: 0.5V to 5.5V (Operating)  
The devices include a 0.16Ω N-channel MOSFET switch  
anda0.21ΩP-channelsynchronousrectifier.TheLTC3423  
is intended for applications requiring less than 0.75W of  
outputpowerandtheLTC3424for1.5Worless.Switching  
frequencies up to 3MHz are programmed with an external  
timing resistor and the oscillator can be synchronized to  
an external clock.  
Very Low Quiescent Current: 38µA (Burst Mode®  
■
Operation)  
■
No External Schottky Diode Required  
■
Synchronizable Switching Frequency  
■
Burst Mode Enable Control  
OPTI-LOOP® Compensation  
■
■
Very Low Shutdown Current: <1µA  
■
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 the operation is at  
constant fixed frequency.  
Small 10-Pin MSUOP Package  
APPLICATIO S  
■
Pagers  
Handheld Instruments  
Cordless Phones  
Wireless Handsets  
GPS Receivers  
Battery Backup  
■
■
■
Otherfeaturesincludea1µAshutdown,thermalshutdown  
and current limit. The LTC3423 and LTC3424 are available  
in the 10-lead MSOP package. For applications requiring  
an output voltage greater than 2.6V, the LTC3401 and  
LTC3402arerecommendedwithouttheneedofaseparate  
voltage for the VDD pin.  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
1-Cell to 1.8V at 600mA Step-Up Converter  
V
= 2.7V TO 5.5V  
DD  
L1  
2.2µH  
Efficiency  
V
DD  
V
OUT  
V
= 0.9V TO 1.5V  
IN  
1.8V  
100  
V
= 1.5V  
600mA  
IN  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
LTC3424  
Burst Mode  
OPERATION  
6
10  
3
4
7
8
9
5
R1  
V
SW  
DD  
110k  
V
= 1.2V  
V = 0.9V  
IN  
IN  
SHDN  
V
OUT  
FB  
+
–
1
C3  
CELL  
V
IN  
44µF  
(2× 22µF)  
2
MODE/SYNC  
V
C
C4  
C1  
2.2µF  
C2  
10µF  
1
470pF  
R2  
249k  
R
GND  
t
C5  
4.7pF  
V
V
= 3.3V  
= 1.8V  
DD  
OUT  
R
30.1k  
RC  
82k  
t
WITH MBRM120T3 SCHOTTKY  
0.1  
1
10  
100  
1000  
C1: TAIYO YUDEN JMK212BJ225MG  
C2: TAIYO YUDEN JMK212BJ106MM  
C3: TAIYO YUDEN JMK325BJ226MM  
L1: SUMIDA CD43-2R2M  
OUTPUT CURRENT (mA)  
0 = FIXED FREQ  
1 = Burst Mode OPERATION  
3223/24 TA02  
3423/24 TA01  
34234f  
1
1234567...12

中文翻译

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