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LTC1772HS6#PBF

更新时间： 2024-11-19 20:10:15
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 167K
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#PBF 技术参数

是否Rohs认证： 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：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：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：e3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）：260
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：AUTOMOTIVE
端子面层：Matte Tin (Sn)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：30宽度：1.625 mm
Base Number Matches：1

LTC1772HS6#PBF 数据手册

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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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