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LTC1147LCS8-3.3 PDF预览

LTC1147LCS8-3.3

更新时间： 2024-09-29 22:55:51
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管控制器
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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中文翻译

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LTC1147LCS8-3.3 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：SOIC包装说明：0.150 INCH, PLASTIC, SO-8
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.07模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：CONSTANT OFF TIME
最大输入电压：16 V最小输入电压：3.5 V
标称输入电压：10 VJESD-30 代码：R-PDSO-G8
JESD-609代码：e0长度：4.9 mm
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：70 °C
最低工作温度：标称输出电压：3.3 V
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Switching Regulator or Controllers最大供电电流 (Isup)：2.1 mA
表面贴装：YES切换器配置：SINGLE
最大切换频率：400 kHz技术：CMOS
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：20
宽度：3.9 mmBase Number Matches：1

LTC1147LCS8-3.3 数据手册

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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

中文翻译

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