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LTC1911EMS8-1.5 PDF预览

LTC1911EMS8-1.5

更新时间： 2024-01-29 03:49:38
品牌 Logo 应用领域
凌特 - Linear 转换器稳压器开关式稳压器或控制器电源电路开关式控制器电感器光电二极管
页数 文件大小 规格书
12页 194K
描述
Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter

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中文翻译

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LTC1911EMS8-1.5 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active包装说明：TSSOP,
针数：8Reach Compliance Code：compliant
风险等级：5.72模拟集成电路 - 其他类型：SWITCHED CAPACITOR REGULATOR
最大输入电压：5.5 V最小输入电压：2.7 V
标称输入电压：3.6 VJESD-30 代码：S-PDSO-G8
JESD-609代码：e3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：封装主体材料：PLASTIC/EPOXY
封装代码：TSSOP封装形状：SQUARE
封装形式：SMALL OUTLINE, 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：1.1 mm
表面贴装：YES切换器配置：DOUBLER INVERTER
最大切换频率：1800 kHz温度等级：COMMERCIAL
端子面层：Matte Tin (Sn)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：30宽度：3 mm
Base Number Matches：1

LTC1911EMS8-1.5 数据手册

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Final Electrical Specifications  
LTC1911-1.5/LTC1911-1.8  
Low Noise, High Efficiency,  
Inductorless Step-Down  
DC/DC Converter  
August 2002  
U
FEATURES  
DESCRIPTIO  
Low Noise Constant Frequency Operation  
The LTC®1911 is a switched capacitor step-down DC/DC  
converter that produces a 1.5V or 1.8V regulated output  
from a 2.7V to 5.5V input. The part uses switched capaci-  
torfractionalconversiontoachievehighefficiencyoverthe  
entire input range. No inductors are required. Internal cir-  
cuitry controls the step-down conversion ratio to optimize  
efficiency as the input voltage and load conditions vary.  
Typical efficiency is over 25% higher than that of a linear  
regulator.  
■
■
2.7V to 5.5V Input Voltage Range  
■
No Inductors  
■
Typical Efficiency 25% Higher Than LDOs  
■
Shutdown Disconnects Load from VIN  
■
Output Voltage: 1.8V ±4% or 1.5V ±4%  
■
Output Current: 250mA  
■
Low Operating Current: IIN = 180µA Typ  
■
Low Shutdown Current: IIN = 10µA Typ  
■
Oscillator Frequency: 1.5MHz  
A unique constant frequency architecture provides a low  
noise regulated output as well as lower input noise than  
conventional charge pump regulators. High frequency  
operation (fOSC = 1.5MHz) simplifies output filtering to  
further reduce conducted noise. To optimize efficiency,  
the part enters Burst ModeTM operation under light load  
conditions.  
■
Soft-Start Limits Inrush Current at Turn On  
■
Short-Circuit and Overtemperature Protected  
■
Available in an 8-Pin MSOP Package  
U
APPLICATIO S  
■
Handheld Computers  
■
Cellular Phones  
Low operating current (180µA with no load, 10µA in  
shutdown) and low external parts count (two 1µF flying  
capacitors and two 10µF bypass capacitors) make the  
LTC1911 ideally suited for space constrained battery-  
powered applications. The part is short-circuit and  
overtemperature protected, and is available in an 8-pin  
MSOP package.  
■
Smart Card Readers  
■
Portable Electronic Equipment  
■
Handheld Medical Instruments  
■
Low Power DSP Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Efficiency  
90  
Single Cell Li-Ion to 1.8V DC/DC Converter  
80  
100mA  
250mA  
70  
60  
LTC1911-1.8  
2.7V TO 5.5V INPUT  
1
2
3
4
8
6
7
5
V
SS/SHDN  
IN  
1-CELL Li-Ion  
OR  
V
I
= 1.8V  
OUT  
OUT  
+
10µF*  
1µF*  
C2  
C2  
V
OUT  
= 250mA  
3-CELL NiMH  
50  
40  
30  
+
10µF*  
–
C1  
IDEAL LDO  
1µF*  
–
GND  
C1  
1911 TA01  
*CERAMIC CAPACITOR  
2
3
4
5
6
INPUT VOLTAGE (V)  
1911 G05  
sn1911 1911is  
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-  
tation that the interconnection ofits circuits as described herein willnotinfringe on existing patentrights.  
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中文翻译

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