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LTC1147LIS8

更新时间： 2024-09-29 22:22:59
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
16页 207K
描述
High Efficiency Step-Down Switching Regulator Controllers

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LTC1147LIS8 数据手册

 浏览型号LTC1147LIS8的Datasheet PDF文件第2页浏览型号LTC1147LIS8的Datasheet PDF文件第3页浏览型号LTC1147LIS8的Datasheet PDF文件第4页浏览型号LTC1147LIS8的Datasheet PDF文件第5页浏览型号LTC1147LIS8的Datasheet PDF文件第6页浏览型号LTC1147LIS8的Datasheet PDF文件第7页 
LTC1147-3.3  
LTC1147-5/ LTC1147L  
Hig h Effic ie nc y Ste p -Do wn  
Switc hing Re g ula to r Co ntro lle rs  
U
DESCRIPTIO  
FEATURES  
■
Very High Efficiency: Over 95% Possible  
The LTC®1147 series are step-down switching regulator  
■
Wide V Range: 3.5V* to 16V  
controllers featuring automatic Burst ModeTM operation to  
IN  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
High Efficiency Maintained Over Three Decades of  
Output Current  
maintain high efficiencies at low output currents. These  
devices drive an external P-channel power MOSFET at  
switchingfrequencies exceeding400kHzusingaconstant  
off-time current mode architecture providing constant  
ripple current in the inductor.  
■
■
■
■
■
■
■
■
Low 160µA Standby Current at Light Loads  
Logic Controlled Micropower Shutdown: IQ < 20µA  
Short-Circuit Protection  
Very Low Dropout Operation: 100% Duty Cycle  
High Efficiency in a Small Amount of Board Space  
Output Can Be Externally Held High in Shutdown  
Available in 8-Pin SO Package  
The operating current level is user-programmable via an  
external current sense resistor. Wide input supply range  
allows operation from 3.5V* to 14V (16V maximum).  
Constantoff-timearchitectureprovides lowdropoutregu-  
lation limited by only the RDS(ON) of the external MOSFET  
and resistance of the inductor and current sense resistor.  
U
The LTC1147 series incorporates automatic power saving  
Burst Mode operation to reduce switching losses when  
load currents drop below the level required for continuous  
operation. Standby power is reduced to only 2mW at  
APPLICATIO S  
■
Notebook and Palmtop Computers  
Portable Instruments  
Battery-Operated Digital Devices  
Cellular Telephones  
■
V = 10V (at IOUT = 0). Load currents in Burst Mode  
IN  
■
operation are typically 0mA to 300mA.  
■
■
DC Power Distribution Systems  
For applications where even higher efficiency is required,  
refer to the LTC1148 data sheet and Application Note 54.  
■
GPS Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Modeis a trademark of Linear Technology Corporation.  
*LTC1147L and LTC1147L-3.3 only.  
U
O
TYPICAL APPLICATI  
LTC1147-5 Efficiency  
V
IN  
(5.2V TO 14V)  
100  
+
+
C
IN  
100µF  
1µF  
V
95  
90  
85  
80  
75  
70  
IN  
PDRIVE  
LTC1147-5  
SHDN  
P-CHANNEL  
Si4431DY  
V
IN  
= 6V  
L*  
50µH  
R
0.05Ω  
**  
SENSE  
V
OUT  
5V/2A  
0V = NORMAL  
>1.5V = SHUTDOWN  
V
IN  
= 10V  
+
SENSE  
1000pF  
I
TH  
–
SENSE  
+
C
T
C
R
C
OUT  
390µF  
1k  
D1  
MBRD330  
C
T
GND  
470pF  
C
C
3300pF  
LT1147 • F01  
*COILTRONICS CTX50-2-MP  
**KRL SL-1-C1-0R050J  
0.001  
0.01  
0.1  
1
LOAD CURRENT (A)  
LT1147 • TA01  
Figure 1. High Efficiency Step-Down Converter  
1
1234567...16

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