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LTC1877

更新时间： 2023-12-20 18:45:20
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
18页 239K
描述
高效率、单片式、同步降压型稳压器

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中文翻译

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LTC1877 数据手册

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LTC1877  
High Efficiency  
Monolithic Synchronous  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
The LTC®1877 s a high efficiency monolithic synchronous  
buck regulator using a constant-frequency, current mode  
architecture. Supplycurrentduringoperationisonly10μA  
and drops to < 1μA in shutdown. The 2.65V to 10V input  
voltage range makes the LTC1877 ideally suited for both  
singleanddualLi-Ionbattery-poweredapplications.100%  
duty cycle provides low dropout operation, extending bat-  
tery life in portable systems.  
n
High Efficiency: Up to 95%  
n
Very Low Quiescent Current: Only 10μA  
During Operation  
n
600mA Output Current at V = 5V  
IN  
n
2.65V to 10V Input Voltage Range  
n
550kHz Constant-Frequency Operation  
n
No Schottky Diode Required  
n
Low Dropout Operation: 100% Duty Cycle  
n
Synchronizable from 400kHz to 700kHz  
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 exter-  
nally 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.  
Selectable Burst Mode® Operation or  
n
Pulse-Skipping Mode  
n
0.8V Reference Allows Low Output Voltages  
n
Shutdown Mode Draws < 1μA Supply Current  
n
2% Output Voltage Accuracy  
n
Current Mode Control for Excellent Line and Load  
Transient Response  
n
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  
feedback 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.  
Overcurrent and Overtemperature Protected  
n
Available in 8-Lead MSOP Package  
APPLICATIONS  
n
Cellular Telephones  
n
Wireless Modems  
n
Personal Information Appliances  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
Portable Instruments  
n
Distributed Power Systems  
n
Battery-Powered Equipment  
Efficiency vs Output Current  
TYPICAL APPLICATION  
High Efficiency Step-Down Converter  
10μH*  
100  
V
= 3.6V  
IN  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
†
IN  
5
7
6
1
2
V
OUT  
3.3V  
SW  
SYNC  
LTC1877  
2.65V  
TO 10V  
V
= 10V  
IN  
20pF  
10μF**  
CER  
+
V
IN  
V
= 7.2V  
IN  
47μF***  
RUN  
887k  
280k  
V
= 5V  
IN  
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  
1877 TA01  
OUT  
IN IN  
OUTPUT CURRENT (mA)  
1877 TA02  
1877fb  
1
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