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LTC1878EMS8

更新时间： 2024-02-11 18:51:34
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 228K
描述
High Efficiency Monolithic Synchronous Step-Down Regulator

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中文翻译

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LTC1878EMS8 数据手册

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Final Electrical Specifications  
LTC1878  
High Efficiency  
Monolithic Synchronous  
Step-Down Regulator  
May 2000  
U
FEATURES  
DESCRIPTIO  
The LTC®1878 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 LTC1878 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  
■
550kHz Constant Frequency Operation  
Synchronizable from 400kHz to 700kHz  
Selectable Burst ModeTM Operation/  
Pulse Skipping Mode  
■
■
Switching frequency is internally set at 550kHz, allowing  
the use of small surface mount inductors and capacitors.  
For noise sensitive applications the LTC1878 can be  
externally synchronized from 400kHz to 700kHz. 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  
■
■
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 LTC1878 is available in a  
space saving 8-lead MSOP package.  
Available in 8-LeUad MSOP Package  
APPLICATIO S  
■
Cellular Telephones  
■
Wireless Modems  
For higher input voltage (12V 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  
= 4.2V  
95  
90  
85  
80  
75  
70  
IN  
High Efficiency Step-Down Converter  
10µH*  
V
†
IN  
7
6
1
2
5
V
OUT  
V
SYNC  
SW  
2.65V  
TO 6V  
IN  
3.3V  
20pF  
887k  
22µF**  
CER  
V
IN  
+
LTC1878  
47µF***  
V
= 6V  
RUN  
IN  
3
I
V
FB  
TH  
GND  
4
280k  
220pF  
Burst Mode OPERATION  
V
= 3.3V  
OUT  
1878 TA01  
L = 10µH  
*TOKO D62CB A920CY-100M  
0.1  
1
10  
100  
1000  
**TAIYO-YUDEN CERAMIC JMK325BJ226MM  
***SANYO POSCAP 6TPA47M  
OUTPUT CURRENT (mA)  
†V  
CONNECTED TO V FOR 2.65V < V < 3.3V  
1878 TA02  
OUT  
IN IN  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
1
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中文翻译

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LTC1878EMS8 替代型号

型号 品牌 替代类型 描述 数据表
LTC1878EMS8#PBF Linear

完全替代

 LTC1878 - High Efficiency Monolithic Synchronous Step-Down Regulator; Package: MSOP; Pins:
LTC1878EMS8#TRPBF Linear

功能相似

 LTC1878 - High Efficiency Monolithic Synchronous Step-Down Regulator; Package: MSOP; Pins:

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