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LTC1879EGN PDF预览

LTC1879EGN

更新时间： 2024-09-29 05:43:43
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 257K
描述
1.2A Synchronous Step-Down Regulator with 15mA Quiescent Current

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中文翻译

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LTC1879EGN 数据手册

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LTC1879  
1.2A Synchronous  
Step-Down Regulator with  
15µA Quiescent Current  
U
FEATURES  
DESCRIPTIO  
■
High Efficiency: Up to 95%  
The LTC®1879 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Operating supply current is only 15µA  
with no load and drops to <1µA in shutdown. The input  
supply voltage range of 2.65V to 10V makes the LTC1879  
ideally suited for both single and dual Li-Ion battery-pow-  
ered applications. 100% duty cycle provides low dropout  
operation, extending battery life in portable systems.  
■
Low Quiescent Current: Only 15µA with No Load  
■
550kHz Constant Frequency Operation  
■
2.65V to 10V Input Voltage Range  
■
VOUT from 0.8V to VIN, IOUT to 1.2A  
■
True PLL Frequency Locking from 350kHz to 750kHz  
■
Power Good Output Voltage Monitor  
■
Low Dropout Operation: 100% Duty Cycle  
Burst Mode® or Pulse Skipping Operation  
■
The switching frequency is internally set to 550kHz, allow-  
ing the use of small surface mount inductors and capaci-  
tors. For noise sensitive applications, the LTC1879 can be  
externally synchronized from 350kHz to 750kHz. Burst  
Mode operation is inhibited during synchronization or  
when the SYNC/MODE pin is pulled low.  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
Shutdown Mode Draws <1µA Supply Current  
■
±2% Output Voltage Accuracy  
■
Overcurrent and Overtemperature Protected  
■
Available in 16-Lead SSOP Package  
The internal synchronous rectifier switch increases effi-  
ciency and eliminates the need for an external Schottky  
diode. Low output voltages are easily supported with a  
0.8Vfeedbackreferencevoltage. TheLTC1879isavailable  
in a 16-lead SSOP package.  
U
APPLICATIO S  
■
Cellular Telephones  
■
Portable Computers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Wireless Modems  
Burst Mode is a registered trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
High Efficiency Step-Down Converter  
Efficiency vs Output Load Current  
V
IN  
2.65V TO 10V  
100  
13  
V
IN  
= 3.6V  
C
IN  
10µF  
90  
80  
70  
60  
50  
40  
30  
SV  
IN  
2
15  
14  
4
8, 9  
5, 12  
6, 11  
7, 10  
3
RUN/SS  
PV  
IN  
V
= 7.2V  
IN  
L1  
SYNC/MODE  
LTC1879  
PGOOD  
SWP  
SWN  
6.2µH  
V
*
OUT  
V
IN  
= 10V  
3.1V  
C
OUT  
47µF  
150k  
I
TH  
PGND  
Burst Mode OPERATION  
= 3.1V  
47pF  
220pF  
V
V
OUT  
L = 6.2µH  
FB  
80.6k  
SGND  
1
28.0k  
0.1  
1
10 100  
OUPUT CURRENT (mA)  
1000  
1879 TA01a  
1879 TA01b  
C
C
: TAIYO YUDEN CERAMIC LMK325BJ106MN  
IN  
: TDK CERAMIC C4532X5ROJ476M  
OUT  
L1: TOKO A921CY6R2M  
*V  
CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.1V  
OUT  
I
N
I
N
1879f  
1
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