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LTC1771ES8

更新时间： 2024-11-18 22:55:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
16页 208K
描述
Low Quiescent Current High Efficiency Step-Down DC/DC Controller

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中文翻译

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LTC1771ES8 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, SOP8,.25
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.1Is Samacsys：N
其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 1.23V TO 18V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：2.8 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：最大输出电流：1 A
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：1.752 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：SINGLE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

LTC1771ES8 数据手册

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Final Electrical Specifications  
LTC1771  
Low Quiescent Current  
High Efficiency Step-Down  
DC/DC Controller  
February 2000  
U
FEATURES  
DESCRIPTIO  
The LTC®1771 is a high efficiency current mode step-  
down DC/DC controller that draws as little as 10µA DC  
supply current to regulate the output at no load while  
maintaining high efficiency for loads up to several amps.  
■
Very Low Standby Current: 10µA  
■
Available in Space-Saving 8-Lead MSOP Package  
■
High Output Currents  
■
Wide VIN Range: 2.8V to 20V Operation  
■
VOUT Range: 1.23V to 18V  
TheLTC1771drivesanexternalP-channelpowerMOSFET  
using a current mode, constant off-time architecture. An  
external sense resistor is used to program the operating  
current level. Current mode control provides short-circuit  
protection, excellent transient response and controlled  
start-up behavior. Burst Mode operation enables the  
LTC1771 to maintain high efficiency down to extremely  
low currents. Shutdown mode further reduces the supply  
current to a mere 2µA. For low noise applications, Burst  
Mode operation can be easily disabled with the MODE pin.  
■
High Efficiency: Over 93% Possible  
■
±2% Output Accuracy  
■
Very Low Dropout Operation: 100% Duty Cycle  
■
Current Mode Operation for Excellent Line and  
Load Transient Response  
Defeatable Burst ModeTM Operation  
■
■
Short-Circuit Protected  
Optional Programmable Soft-Start  
■
■
Micropower Shutdown: IQ = 2µA  
U
Wide input supply range of 2.8V to 18V (20V maximum)  
and 100% duty cycle operation for low dropout make the  
LTC1771 ideal for a wide variety of battery-powered appli-  
cations where maximizing battery life is important.  
APPLICATIO S  
■
Cellular Telephones and Wireless Modems  
■
1- to 4-Cell Lithium-Ion-Powered Applications  
■
Portable Instruments  
The LTC1771’s availability in both 8-lead MSOP and SO  
packages provides for a minimum area solution.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
Battery-Powered Equipment  
■
Battery Chargers  
■
Scanners  
U
TYPICAL APPLICATIO  
V
IN  
4.5V TO 18V  
LTC1771 Efficiency  
100  
10µF  
25V  
CER  
R
SENSE  
0.05Ω  
V
IN  
= 5V  
90  
80  
70  
60  
50  
40  
V
= 10V  
IN  
M1  
V
SENSE  
PGATE  
IN  
RUN/SS  
Si6447DQ  
L1  
V
IN  
= 15V  
15µH  
V
3.3V  
2A  
OUT  
C
SS  
0.01µF  
LTC1771  
I
TH  
R
C
V
V
MODE  
UPS5817  
+
FB  
IN  
C
OUT  
10k  
GND  
150µF  
R2  
1.64M  
1%  
C
C
6.3V  
22OpF  
R1  
V
= 3.3V  
SENSE  
OUT  
1M  
1%  
R
= 0.05Ω  
5pF  
0.1  
1
10  
100  
1000  
10000  
1771 F01  
LOAD CURRENT (mA)  
1771 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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中文翻译

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