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LTC1772CS6

更新时间： 2024-11-18 22:55:51
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 192K
描述
Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

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中文翻译

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LTC1772CS6 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, TSOP6,.11,37
针数：6Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.06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：70 °C
最低工作温度：最大输出电流：1 A
封装主体材料：PLASTIC/EPOXY封装代码：VSSOP
封装等效代码：TSOP6,.11,37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
子类别：Switching Regulator or Controllers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：COMMERCIAL
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

LTC1772CS6 数据手册

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Final Electrical Specifications  
LTC1772  
Constant Frequency  
Current Mode Step-Down  
DC/DC Controller in SOT-23  
September 1999  
U
DESCRIPTION  
FEATURES  
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 Efficiency: Up to 94%  
■
High Output Currents Easily Achieved  
■
Wide VIN Range: 2.5V to 9.8V  
■
Constant Frequency 550kHz Operation  
Burst ModeTM Operation at Light Load  
■
■
Low Dropout: 100% Duty Cycle  
0.8V Reference Allows Low Output Voltages  
Current Mode Operation for Excellent Line and Load  
Transient Response  
Low Quiescent Current: 270µA  
Shutdown Mode Draws Only 8µA Supply Current  
TheLTC1772boastsa±2.5%outputvoltageaccuracyand  
consumes only 270µA of quiescent current. For applica-  
tionswhereefficiencyisaprimeconsideration,theLTC1772  
is configured for Burst Mode operation, which enhances  
efficiency at low output current.  
■
■
■
■
■
■
To further maximize the life of a battery source, the  
external P-channel MOSFET is turned on continuously in  
dropout(100%dutycycle).Inshutdown,thedevicedraws  
a mere 8µA. High constant operating frequency of 550kHz  
allows the use of a small external inductor.  
±2.5% Reference Accuracy  
Tiny 6-Lead SOT-23 Package  
U
APPLICATIONS  
■
One or Two Lithium-Ion-Powered Applications  
The LTC1772 is available in a small footprint 6-lead  
SOT-23.  
■
Cellular Telephones  
■
Wireless Modems  
Portable Computers  
Distributed 3.3V, 2.5V or 1.8V Power Systems  
Scanners  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
■
U
TYPICAL APPLICATION  
Efficiency vs Load Current  
100  
V
IN  
V
IN  
= 4.2V  
2.5V  
V
IN  
= 3.3V  
C1  
10µF  
16V  
R1  
TO 9.8V  
90  
80  
0.03Ω  
1
6
L1  
4.7µH  
V
IN  
= 6V  
I
/RUN PGATE  
LTC1772  
M1  
TH  
V
2.5V  
2A  
OUT  
10k  
220pF  
70  
60  
V
= 8.4V  
IN  
+
C2  
47µF  
6V  
V
IN  
= 9.8V  
2
3
5
4
169k  
GND  
V
D1  
IN  
–
V
SENSE  
FB  
78.7k  
50  
40  
V
= 2.5V  
SENSE  
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT  
C2: SANYO POSCAP 6TPA47M  
D1: IR10BQ015  
L1: MURATA LQN6C-4R7  
M1: Si3443DV  
R1: DALE 0.25W  
OUT  
R
= 0.03Ω  
1772 F01a  
1
10  
100  
1000  
10000  
LOAD CURRENT (mA)  
1772 F01b  
Figure 1. High Efficiency Step-Down Converter  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
1
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