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LTC1147CN8-5#PBF

更新时间： 2025-07-18 18:58:59
品牌 Logo 应用领域
亚德诺 - ADI 光电二极管
页数 文件大小 规格书
16页 222K
描述
元器件封装:8-PDIP;

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LTC1147CN8-5#PBF 数据手册

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LTC1147-3.3  
LTC1147-5/LTC1147L  
High Efficiency Step-Down  
Switching Regulator Controllers  
U
DESCRIPTIO  
FEATURES  
The LTC®1147 series are step-down switching regulator  
■
Very High Efficiency: Over 95% Possible  
■
Wide VIN Range: 3.5V* to 16V  
controllers featuring automatic Burst ModeTM operation to  
■
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  
switchingfrequenciesexceeding400kHzusingaconstant  
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-timearchitectureprovideslowdropoutregu-  
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  
VIN = 10V (at IOUT = 0). Load currents in Burst Mode  
operation are typically 0mA to 300mA.  
APPLICATIO S  
■
Notebook and Palmtop Computers  
■
Portable Instruments  
■
Battery-Operated Digital Devices  
■
Cellular Telephones  
■
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  
P-CHANNEL  
Si4431DY  
V
= 6V  
IN  
PDRIVE  
LTC1147-5  
SHDN  
L*  
R
**  
SENSE  
50µH  
0.05Ω  
V
OUT  
0V = NORMAL  
5V/2A  
>1.5V = SHUTDOWN  
V
= 10V  
IN  
+
SENSE  
1000pF  
I
C
TH  
–
SENSE  
+
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  
sn1147 1147fds  
1
1234567...16

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