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LTC3447EDD

更新时间： 2024-02-21 22:06:34
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 561K
描述
LTC3447 - I<sup>2</sup>C Controllable Buck Regulator in 3mm x 3mm DFN; Package: DFN; Pins: 10; Temperature Range: -40&deg;C to 85&deg;C

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中文翻译

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LTC3447EDD 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：DFN包装说明：HVSSON,
针数：10Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.18模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE最大输入电压：5.5 V
最小输入电压：2.5 V标称输入电压：3.6 V
JESD-30 代码：S-PDSO-N10JESD-609代码：e0
长度：3 mm湿度敏感等级：1
功能数量：1端子数量：10
最高工作温度：70 °C最低工作温度：
最大输出电流：0.8 A封装主体材料：PLASTIC/EPOXY
封装代码：HVSSON封装形状：SQUARE
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, 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：0.8 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：1300 kHz温度等级：COMMERCIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：NO LEAD
端子节距：0.5 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：3 mm
Base Number Matches：1

LTC3447EDD 数据手册

 浏览型号LTC3447EDD的Datasheet PDF文件第2页浏览型号LTC3447EDD的Datasheet PDF文件第3页浏览型号LTC3447EDD的Datasheet PDF文件第4页浏览型号LTC3447EDD的Datasheet PDF文件第5页浏览型号LTC3447EDD的Datasheet PDF文件第6页浏览型号LTC3447EDD的Datasheet PDF文件第7页 
LTC3447  
I C Controllable Buck  
Regulator in 3mm × 3mm DFN  
2
U
FEATURES  
DESCRIPTIO  
2
I C Programmable Output with 21.6mV Resolution  
TheLTC®3447isahighefficiencymonolithicsynchronous  
■
2
■
Overtemperature Protected  
current mode buck regulator. Using an I C interface, the  
■
High Efficiency: Up to 93%  
output voltage can be set between 0.69V and 2.05V using  
an internal 6-bit DAC.  
■
Very Low Quiescent Current: Only 33µA  
■
600mA Output Current at V = 3V  
IN  
The buck regulator has optional external feedback resis-  
tors that can be used for setting the initial start up voltage.  
The feedback voltage reference for this start-up option  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
2.5V to 5.5V Input Voltage Range  
1MHz Constant Frequency Operation  
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
Stable with Ceramic Capacitors  
Shutdown Mode Draws <1µA Supply Current  
2% Output Voltage Accuracy  
Standard (100kHz) or Fast Mode (400kHz) I C  
6-Bit Voltage DAC (0.69V to 2.05V)  
Disable Burst Mode Operation  
Enable Power Good Blanking  
Optional External Start-Up Resistors  
Soft-Start  
10 Lead, 3mm ×U3mm DFN Package  
2
is 0.6V. Once the voltage DAC is updated via the I C, the  
buckregulatorswitchesfromexternaltointernalfeedback  
resistors. When there are no external resistors, the default  
start-up voltage is 1.38V.  
2
The switching frequency is internally set at 1MHz, al-  
lowing the use of small surface mount inductors and  
capacitors.  
In Burst Mode® operation, supply current is only 33µA,  
dropping to <1µA in shutdown. The 2.5V to 5.5V input  
voltage range makes the LTC3447 ideally suited for single  
cell Li-Ion battery-powered applications. 100% duty cycle  
capability provides low dropout operation, extending  
battery life in portable systems. Automatic Burst Mode  
operation increases efficiency at light loads, further ex-  
tending battery life.  
APPLICATIO S  
■
Distributed Power Supplies  
Notebook Computers  
PDAs and Other Handheld Devices  
■
■
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode.  
, 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.  
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815,  
6498466, 6611131.  
U
Efficiency and Power Loss vs  
Load Current (VIN = 3.6V)  
TYPICAL APPLICATIO  
V
IN  
1000  
100  
10  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
2.5V TO 5.5V  
C2  
4.7µF  
V
IN  
CERAMIC  
RPU1  
20k  
V
IN  
2
PWREN  
RUN  
PGOOD  
I C  
V
CCD  
V
OUT  
LTC3447  
0.69V  
V
SW  
CCD  
TO 2.05V  
AT 600mA*  
L1  
3.3µH  
C3  
4.7µF  
C1  
10µF  
10k  
SDA  
SCL  
10k  
R1  
SDA  
SCL  
GND  
V
OUT  
100k  
FB  
PULSE SKIP EFFICIENCY  
Burst Mode EFFICIENCY  
LOSS  
R2  
49.9k  
* 600mA AT V = 3V  
IN  
1
EXPOSED PADDLE  
TO GROUND  
1
10  
100  
1000  
3447 TA01  
3447 TA01b  
LOAD CURRENT (mA)  
3447f  
1
1234567...16

中文翻译

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