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LTC1877EMS8 PDF预览

LTC1877EMS8

更新时间： 2024-09-28 22:22:43
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 228K
描述
High Efficiency Monolithic Synchronous Step-Down Regulator

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中文翻译

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LTC1877EMS8 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：MSOP包装说明：PLASTIC, MSOP-8
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.14Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：10 V
最小输入电压：2.65 V标称输入电压：5 V
JESD-30 代码：S-PDSO-G8JESD-609代码：e0
长度：3 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：1.5 A封装主体材料：PLASTIC/EPOXY
封装代码：TSSOP封装等效代码：TSSOP8,.19
封装形状：SQUARE封装形式：SMALL OUTLINE, 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：1.1 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：605 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：0.65 mm
端子位置：DUAL处于峰值回流温度下的最长时间：20
宽度：3 mmBase Number Matches：1

LTC1877EMS8 数据手册

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Final Electrical Specifications  
LTC1877  
High Efficiency  
Monolithic Synchronous  
Step-Down Regulator  
May 2000  
U
FEATURES  
DESCRIPTION  
The LTC®1877 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Supply current during operation is  
only 10µA and drops to < 1µA in shutdown. The 2.65V to  
10V input voltage range makes the LTC1877 ideally suited  
for both single and dual Li-Ion battery-powered applica-  
tions. 100% duty cycle provides low dropout operation,  
extending battery life in portable systems.  
■
High Efficiency: Up to 95%  
■
Very Low Quiescent Current: Only 10µA  
During Operation  
■
600mA Output Current at VIN = 5V  
2.65V to 10V Input Voltage Range  
■
■
550kHz Constant Frequency Operation  
Synchronizable from 400kHz to 700kHz  
Selectable Burst ModeTM Operation/  
Pulse Skipping Mode  
■
■
Switching frequency is internally set at 550kHz, allowing  
the use of small surface mount inductors and capacitors.  
For noise sensitive applications the LTC1877 can be  
externally synchronized from 400kHz to 700kHz. Burst  
Mode operation is inhibited during synchronization or  
when the SYNC/MODE pin is pulled low, preventing low  
frequency ripple from interfering with audio circuitry.  
■
■
■
■
■
■
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
0.8V Reference Allows Low Output Voltages  
Shutdown Mode Draws < 1µA Supply Current  
±2% Output Voltage Accuracy  
Current Mode Control for Excellent Line and  
Load Transient Response  
Overcurrent and Overtemperature Protected  
Available in 8-Lead MSOP Package  
■
■
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with the 0.8V feed-  
back reference voltage. The LTC1877 is available in a  
space saving 8-lead MSOP package. Lower input voltage  
applications (less than 7V abs max) should refer to the  
LTC1878 data sheet.  
U
APPLICATIONS  
■
Cellular Telephones  
■
Wireless Modems  
■
Personal Information Appliances  
■
Portable Instruments  
■
Distributed Power Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
Battery-Powered Equipment  
U
Efficiency vs Output Current  
TYPICAL APPLICATION  
100  
V
= 3.6V  
IN  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
High Efficiency Step-Down Converter  
10µH*  
V
†
IN  
5
7
6
1
2
V
= 10V  
V
IN  
OUT  
3.3V  
SW  
LTC1877  
SYNC  
2.65V  
20pF  
TO 10V  
10µF**  
V
= 7.2V  
IN  
+
V
IN  
CER  
47µF***  
V
= 5V  
RUN  
IN  
887k  
280k  
3
V
FB  
I
TH  
GND  
4
220pF  
V
= 3.3V  
OUT  
L = 10µH  
*TOKO D62CB A920CY-100M  
Burst Mode OPERATION  
**TAIYO-YUDEN CERAMIC LMK325BJ106MN  
***SANYO POSCAP 6TPA47M  
0.1  
1000  
1.0  
10  
100  
†V  
CONNECTED TO V FOR 2.65V < V < 3.3V  
OUTPUT CURRENT (mA)  
1877 TA01  
OUT  
IN IN  
1877 • TA02  
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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LTC1877EMS8 替代型号

型号 品牌 替代类型 描述 数据表
LTC1877EMS8#TR Linear

完全替代

 LTC1877 - High Efficiency Monolithic Synchronous Step-Down Regulator; Package: MSOP; Pins:
LTC1877EMS8#TRPBF Linear

完全替代

 LTC1877 - High Efficiency Monolithic Synchronous Step-Down Regulator; Package: MSOP; Pins:

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LTC1877EMS8#TRPBF Linear

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