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LTC1148LCS#TR

更新时间： 2024-09-30 13:09:43
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 388K
描述
LTC1148 - High Efficiency Synchronous Step-Down Switching Regulators; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C

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中文翻译

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LTC1148LCS#TR 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：SOP, SOP14,.25
针数：14Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.08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：20 V最小输入电压：4 V
标称输入电压：10 VJESD-30 代码：R-PDSO-G14
JESD-609代码：e0长度：8.649 mm
湿度敏感等级：1功能数量：1
端子数量：14最高工作温度：70 °C
最低工作温度：最大输出电流：0.05 A
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP14,.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：1.752 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：250 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：3.899 mm
Base Number Matches：1

LTC1148LCS#TR 数据手册

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LTC1148  
LTC1148-3.3/LTC1148-5  
High Efficiency Synchronous  
Step-Down Switching Regulators  
U
DESCRIPTIO  
EATURE  
S
F
The LTC®1148 series is a family of synchronous step-  
down switching regulator controllers featuring automatic  
Burst ModeTM operation to maintain high efficiencies at  
low output currents. These devices drive external comple-  
mentary power MOSFETs at switching frequencies up to  
250kHz using a constant off-time current-mode architec-  
ture providing constant ripple current in the inductor.  
■
Ultrahigh Efficiency: Over 95% Possible  
Current-Mode Operation for Excellent Line and Load  
Transient Response  
High Efficiency Maintained Over Three Decades of  
Output Current  
■
■
■
■
■
■
■
■
■
■
■
Low 160µA Standby Current at Light Loads  
Logic Controlled Micropower Shutdown: IQ < 20µA  
Wide VIN Range: 3.5V* to 20V  
The operating current level is user-programmable via an  
external current sense resistor. Wide input supply range  
allows operation from 3.5V* to 18V (20V maximum).  
Constantoff-timearchitectureprovideslowdropoutregu-  
lation limited by only the RDS(ON) of the external MOSFET  
and resistance of the inductor and current sense resistor.  
Short-Circuit Protection  
Very Low Dropout Operation: 100% Duty Cycle  
Synchronous FET Switching for High Efficiency  
Adaptive Nonoverlap Gate Drives  
Output Can Be Externally Held High in Shutdown  
Available in 14-Pin Narrow SO Package  
The LTC1148 series combines synchronous switching for  
maximum efficiency at high currents with an automatic low  
currentoperatingmode,calledBurstModeoperation,which  
reducesswitchinglosses.Standbypowerisreducedtoonly  
2mWatVIN =10V(atIOUT =0). LoadcurrentsinBurstMode  
operation are typically 0mA to 300mA.  
O U  
PPLICATI  
S
A
■
■
■
■
■
■
Notebook and Palmtop Computers  
Portable Instruments  
Battery-Operated Digital Devices  
Cellular Telephones  
DC Power Distribution Systems  
GPS Systems  
For operation up to 48V input, see the LTC1149 and  
LTC1159 data sheets and Application Note 54.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Modeis a trademark of Linear Technology Corporation.  
* LTC1148L and LTC1148L-3.3 only.  
U
O
TYPICAL APPLICATI  
LTC1148-5 Efficiency  
V
IN  
(5.2V TO 18V)  
100  
V
= 6V  
IN  
+
+
C
IN  
100µF  
1µF  
V
IN  
P-DRIVE  
LTC1148HV-5  
SHUTDOWN  
95  
90  
85  
80  
P-CHANNEL  
Si4431DY  
V
IN  
= 10V  
L*  
62µH  
R
**  
SENSE  
0.05Ω  
V
OUT  
0V = NORMAL  
>1.5V = SHUTDOWN  
5V/2A  
+
SENSE  
1000pF  
I
C
TH  
–
SENSE  
+
T
C
R
C
OUT  
390µF  
D1  
MBRS140T3  
N-CHANNEL  
Si4412DY  
N-DRIVE  
PGND  
1k  
C
T
SGND  
470pF  
C
C
3300pF  
LT1148 • TA01  
0.02  
0.2  
LOAD CURRENT (A)  
2
*COILTRONICS CTX62-2-MP  
**KRL SL-1-C1-0R050J  
LTC1148 • TA01  
Figure 1. High Efficiency Step-Down Converter  
1
1234567...20

中文翻译

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