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LTC3709

更新时间： 2023-12-20 18:45:54
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
24页 320K
描述
具跟踪 / 排序功能的快速、两相、No RSENSE? 同步 DC/DC 控制器

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中文翻译

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LTC3709 数据手册

 浏览型号LTC3709的Datasheet PDF文件第2页浏览型号LTC3709的Datasheet PDF文件第3页浏览型号LTC3709的Datasheet PDF文件第4页浏览型号LTC3709的Datasheet PDF文件第5页浏览型号LTC3709的Datasheet PDF文件第6页浏览型号LTC3709的Datasheet PDF文件第7页 
LTC3709  
TM  
SENSE  
Fast 2-Phase, No R  
,
Synchronous DC/DC Controller  
with Tracking/Sequencing  
U
FEATURES  
DESCRIPTIO  
PolyPhase® Valley Current Mode Controller  
TheLTC®3709isasingleoutput,dualphase,synchronous  
step-down switching regulator. The controller uses a  
constant on-time, valley current control architecture to  
deliver very low duty cycles without requiring a sense  
resistor. Operating frequency is selected by an external  
resistor and is compensated for variations in input supply  
voltage. An internal phase-lock loop allows the LTC3709  
to be synchronized to an external clock.  
■
■
Synchronizable to an External Clock with PLL  
■
Coincident or Ratiometric Tracking  
■
Sense Resistor Optional  
■
2% to 90% Duty Cycle at 200kHz  
■
tON(MIN) < 100ns  
■
True Remote Sensing Differential Amplifier  
■
High Efficiency at Both Light and Heavy Loads  
■
Power Good Output Voltage Monitor  
A TRACK pin is provided for tracking or sequencing the  
output voltage among several LTC3709 chips or an  
LTC3709 and other DC/DC regulators. Soft-start is ac-  
■
0.6V ±1% Reference  
Adjustable Current Limit  
■
■
Programmable Soft-Start and Operating Frequency  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Available in 32-Lead (5mm × 5mm) QFN and 36-Lead  
complished using an external timing capacitor.  
■
■
■
Faultprotectionisprovidedbyanoutputovervoltagecom-  
parator and an optional short-circuit shutdown timer. The  
current limit level is user programmable. A wide supply  
range allows voltages as high as 31V to step down as low  
SSOP Packages U  
as 0.6V.  
APPLICATIO S  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
■
No R  
is a trademark of Linear Technology Corporation.  
Notebook Computers  
Power Supply for DSP, ASIC, Graphic Processors  
SENSE  
PolyPhase 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, 6476589, 6144194, 5847554, 6100678,  
6304066, 6580258, 6674274, 6462525, 6593724.  
■
U
TYPICAL APPLICATIO  
High Efficiency Dual Phase 1.5V/30A Step-Down Converter  
5V  
4.7µF  
324k  
10Ω  
V
IN  
4.5V TO 28V  
10µF  
35V  
×3  
1µF  
V
DRV  
I
47.5k  
CC  
CC ON  
TG1  
HAT2168H  
HAT2165H  
TRACK  
Efficiency and Power Loss  
V
RNG  
0.22µF  
FCB  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
10  
9
8
7
6
5
4
3
2
1
0
BOOST1  
SW1  
1.22µH  
10k  
V
= 12V  
IN  
100k  
+
0.1µF  
SENSE1  
PGOOD  
EFFICIENCY  
RUN/SS  
BG1  
–
EXTLPF  
INTLPF  
SENSE1  
3.32k  
PGND1  
100nF  
680pF  
LTC3709  
I
TH  
V
IN  
20k  
HAT2168H  
HAT2165H  
SGND  
TG2  
BOOST2  
SW2  
0.22µF  
POWER LOSS  
10k  
1.22µH  
V
1.5V  
30A  
OUT  
V
FB  
+
DIFFOUT  
SENSE2  
15k  
BG2  
–
0.01  
0.1  
1
10  
100  
–
330µF  
2.5V  
×4  
+
V
V
LOAD CURRENT (A)  
OS  
SENSE2  
PGND2  
+
3709 TA01b  
OS  
3709 TA01a  
3709fb  
1
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