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LTC1877

更新时间： 2024-02-13 10:28:40
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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LTC1877 数据手册

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Final Electrical Specifications  
LTC1877  
High Efficiency  
Monolithic Synchronous  
Step-Down Regulator  
May 2000  
U
FEATURES  
DESCRIPTION  
The LTC®1877 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  
10V input voltage range makes the LTC1877 ideally suited  
for both single and dual Li-Ion battery-powered applica-  
tions. 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 = 5V  
2.65V to 10V 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 LTC1877 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  
Available in 8-Lead MSOP Package  
■
■
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 LTC1877 is available in a  
space saving 8-lead MSOP package. Lower input voltage  
applications (less than 7V abs max) should refer to the  
LTC1878 data sheet.  
U
APPLICATIONS  
■
Cellular Telephones  
■
Wireless Modems  
■
Personal Information Appliances  
■
Portable Instruments  
■
Distributed Power Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
Battery-Powered Equipment  
U
Efficiency vs Output Current  
TYPICAL APPLICATION  
100  
V
= 3.6V  
IN  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
High Efficiency Step-Down Converter  
10µH*  
V
†
IN  
5
7
6
1
2
V
= 10V  
V
IN  
OUT  
3.3V  
SW  
LTC1877  
SYNC  
2.65V  
20pF  
TO 10V  
10µF**  
V
= 7.2V  
IN  
+
V
IN  
CER  
47µF***  
V
= 5V  
RUN  
IN  
887k  
280k  
3
V
FB  
I
TH  
GND  
4
220pF  
V
= 3.3V  
OUT  
L = 10µH  
*TOKO D62CB A920CY-100M  
Burst Mode OPERATION  
**TAIYO-YUDEN CERAMIC LMK325BJ106MN  
***SANYO POSCAP 6TPA47M  
0.1  
1000  
1.0  
10  
100  
†V  
CONNECTED TO V FOR 2.65V < V < 3.3V  
OUTPUT CURRENT (mA)  
1877 TA01  
OUT  
IN IN  
1877 • TA02  
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.  
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