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LTC3404MPMS8#TR PDF预览

LTC3404MPMS8#TR

更新时间： 2024-02-24 07:30:01
品牌 Logo 应用领域
凌特 - Linear 稳压器开关光电二极管
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16页 198K
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LTC3404MPMS8#TR 数据手册

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LTC3404  
1.4MHz High Efficiency  
Monolithic Synchronous  
Step-Down Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®3404 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Supply current during operation is  
only 10μA and drops to < 1μA in shutdown. The 2.65V to  
6V input voltage range makes the LTC3404 ideally suited  
forsingleLi-Ionbattery-poweredapplications. 100%duty  
cycle provides low dropout operation, extending battery  
life in portable systems.  
■
High Efficiency: Up to 95%  
■
Very Low Quiescent Current: Only 10μA  
During Operation  
■
600mA Output Current at VIN = 3.3V  
■
2.65V to 6V Input Voltage Range  
■
1.4MHz Constant Frequency Operation  
No Schottky Diode Required  
■
■
■
■
Low Dropout Operation: 100% Duty Cycle  
Synchronizable from 1MHz to 1.7MHz  
Selectable Burst Mode® Operation or  
Pulse Skipping Mode  
0.8V Reference Allows Low Output Voltages  
Shutdown Mode Draws < 1μA Supply Current  
±2% Output Voltage Accuracy  
Current Mode Control for Excellent Line and  
Load Transient Response  
Switching frequency is internally set at 1.4MHz, allowing  
the use of small surface mount inductors and capacitors.  
For noise sensitive applications the LTC3404 can be  
externally synchronized from 1MHz to 1.7MHz. Burst  
Mode operation is inhibited during synchronization or  
when the SYNC/MODE pin is pulled low, preventing low  
frequency ripple from interfering with audio circuitry.  
■
■
■
■
■
■
Overcurrent and Overtemperature Protected  
Available in 8-Lead MSOP Package  
U
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with the 0.8V feed-  
back reference voltage. The LTC3404 is available in a  
space saving 8-lead MSOP package.  
APPLICATIO S  
■
Cellular Telephones  
■
Wireless and DSL Modems  
For higher input voltage (11V abs max) applications, refer  
to the LTC1877 data sheet.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Personal Information Appliances  
■
Portable Instruments  
■
Distributed Power Systems  
■
Battery-Powered Equipment  
U
Efficiency vs Output Load Current  
TYPICAL APPLICATIO  
100  
V
= 3.6V  
IN  
95  
90  
85  
80  
75  
70  
High Efficiency Step-Down Converter  
4.7μH*  
V
= 4.2V  
V
†
IN  
IN  
7
6
1
2
5
V
OUT  
SYNC  
SW  
2.65V  
TO 6V  
3.3V  
V
= 6V  
20pF  
887k  
IN  
10μF***  
CER  
V
IN  
22μF**  
CER  
LTC3404  
RUN  
3
I
V
FB  
TH  
GND  
4
280k  
47pF  
Burst Mode OPERATION  
3404 TA01  
V
= 3.3V  
OUT  
L = 4.7μH  
*TOKO D52LC A914BYW-4R7M  
**TAIYO-YUDEN CERAMIC JMK325BJ226MM  
***TAIYO-YUDEN CERAMIC LMK325BJ106MN  
0.1  
1
10  
100  
1000  
LOAD (mA)  
†V  
CONNECTED TO V FOR 2.65V < V < 3.3V  
OUT  
IN IN  
3404 TA02  
3404fb  
1
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LTC3404MPMS8#TR 替代型号

型号 品牌 替代类型 描述 数据表
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