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LTC1772HS6#TRM

更新时间： 2024-11-19 19:22:51
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
12页 145K
描述
LTC1772 - Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 125°C

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中文翻译

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LTC1772HS6#TRM 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：SOT包装说明：VSSOP,
针数：6Reach Compliance Code：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：PULSE WIDTH MODULATION
最大输入电压：9.8 V最小输入电压：2.5 V
标称输入电压：4.2 VJESD-30 代码：R-PDSO-G6
JESD-609代码：e0长度：2.9 mm
湿度敏感等级：1功能数量：1
端子数量：6最高工作温度：140 °C
最低工作温度：-40 °C最大输出电流：1 A
封装主体材料：PLASTIC/EPOXY封装代码：VSSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：235认证状态：Not Qualified
座面最大高度：1 mm表面贴装：YES
切换器配置：BUCK最大切换频率：650 kHz
技术：CMOS温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.95 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：1.625 mm
Base Number Matches：1

LTC1772HS6#TRM 数据手册

 浏览型号LTC1772HS6#TRM的Datasheet PDF文件第2页浏览型号LTC1772HS6#TRM的Datasheet PDF文件第3页浏览型号LTC1772HS6#TRM的Datasheet PDF文件第4页浏览型号LTC1772HS6#TRM的Datasheet PDF文件第5页浏览型号LTC1772HS6#TRM的Datasheet PDF文件第6页浏览型号LTC1772HS6#TRM的Datasheet PDF文件第7页 
LTC1772  
Constant Frequency  
Current Mode Step-Down  
DC/DC Controller in SOT-23  
U
DESCRIPTIO  
FEATURES  
■
High Efficiency: Up to 94%  
The LTC®1772 is a constant frequency current mode step-  
downDC/DCcontrollerprovidingexcellentACandDCload  
and line regulation. The device incorporates an accurate  
undervoltagelockoutfeaturethatshutsdowntheLTC1772  
when the input voltage falls below 2.0V.  
■
High Output Currents Easily Achieved  
■
Wide VIN Range: 2.5V to 9.8V  
■
Constant Frequency 550kHz Operation  
Burst Mode® Operation at Light Load  
■
■
Low Dropout: 100% Duty Cycle  
Tiny 6-Lead SOT-23 Package  
0.8V Reference Allows Low Output Voltages  
The LTC1772 provides a ±2.5% output voltage accuracy  
and consumes only 270µA of quiescent current. For  
applications where efficiency is a prime consideration, the  
LTC1772 is configured for Burst Mode operation, which  
enhances efficiency at low output current.  
■
■
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
Low Quiescent Current: 270µA  
■
■
To further maximize the life of a battery source, the  
external P-channel MOSFET is turned on continuously in  
dropout (100%dutycycle).In shutdown, the device draws  
a mere 8µA. High constant operating frequency of 550kHz  
allows the use of a small external inductor.  
Shutdown Mode Draws Only 8µA Supply Current  
±2.5% Reference Accuracy  
U
APPLICATIO S  
■
One or Two Lithium-Ion-Powered Applications  
The LTC1772 is available in a small footprint 6-lead  
SOT-23.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Cellular Telephones  
■
Wireless Modems  
■
Portable Computers  
■
Distributed 3.3V, 2.5V or 1.8V Power Systems  
■
Scanners  
U
TYPICAL APPLICATIO  
V
Efficiency vs Load Current  
IN  
2.5V  
100  
90  
80  
70  
60  
50  
40  
C1  
TO 9.8V  
R1  
0.03Ω  
V
= 4.2V  
IN  
10µF  
V
= 3.3V  
IN  
10V  
1
6
L1  
4.7µH  
I
/RUN PGATE  
LTC1772  
M1  
TH  
V
2.5V  
2A  
OUT  
10k  
220pF  
V = 6V  
IN  
+
C2A  
47µF  
6V  
C2B  
1µF  
10V  
2
3
5
4
GND  
V
D1  
IN  
–
V
= 8.4V  
IN  
174k  
V
= 9.8V  
IN  
V
SENSE  
FB  
C1: TAIYO YUDEN LMK325BJ106K-T  
C2A: SANYO 6TPA47M  
C2B: AVX 0805ZC105KAT1A  
D1: MOTOROLA MBRM120T3  
L1: MURATA LQN6C-4R7  
80.6k  
V
= 2.5V  
OUT  
1
10  
100  
1000  
10000  
1772 F01a  
M1: FAIRCHILD FDC638P  
R1: IRC LRC-LR1206-01-R030F  
LOAD CURRENT (mA)  
1772 F01b  
1772fb  
1
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator  
1234567...12

中文翻译

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