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LTC3404

更新时间： 2022-12-13 11:23:39
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 242K
描述
1.4MHz High Efficiency Monolithic Synchronous Step-Down Regulator

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LTC3404 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  
Synchronizable from 1MHz to 1.7MHz  
Selectable Burst ModeTM Operation or  
Pulse Skipping Mode  
■
■
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.  
■
■
■
■
■
■
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
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  
■
■
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.  
■
Personal Information Appliances  
■
Portable Instruments  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Distributed Power Systems  
Burst Mode is a trademark of Linear Technology Corporation.  
■
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  
1
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