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LTC3611 PDF预览

LTC3611

更新时间: 2023-12-20 18:44:13
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
26页 415K
描述
10A、32V 单片式同步降压型 DC/DC 转换器

LTC3611 数据手册

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LTC3611  
10A, 32V Monolithic  
Synchronous Step-Down  
DC/DC Converter  
Description  
FeAtures  
TheLTC®3611isahighefficiency,monolithicsynchronous  
step-down DC/DC converter that can deliver up to 10A  
output current from a 4.5V to 32V (36V maximum) input  
supply. It uses a constant on-time valley current mode  
control architecture to deliver very low duty cycle opera-  
tion at high frequency with excellent transient response.  
Theoperatingfrequencyisselectedbyanexternalresistor  
n
10A Output Current  
n
Wide V Range = 4.5V to 32V (36V Maximum)  
IN  
n
Internal N-Channel MOSFETs  
True Current Mode Control  
Optimized for High Step-Down Ratios  
n
n
n
t
≤ 100ns  
0N(MIN)  
n
n
n
n
n
n
n
n
n
n
n
Extremely Fast Transient Response  
Stable with Ceramic C  
and is compensated for variations in V and V  
.
OUT  
IN  
OUT  
1ꢀ 0.6V Voltage Reference  
The LTC3611 can be configured for discontinuous or  
forced continuous operation at light load. Forced continu-  
ous operation reduces noise and RF interference while  
discontinuous mode provides high efficiency by reducing  
switching losses at light loads.  
Power Good Output Voltage Monitor  
Adjustable On-Time/Switching Frequency (>1MHz)  
Adjustable Current Limit  
Programmable Soft-Start  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Low Shutdown I : 15μA  
Available in a 9mm × 9mm 64-Pin QFN Package  
Fault protection is provided by internal foldback current  
limiting,anoutputovervoltagecomparatorandanoptional  
short-circuitshutdowntimer.Soft-startcapabilityforsup-  
ply sequencing is accomplished using an external timing  
capacitor.Theregulatorcurrentlimitisuserprogrammable.  
A power good output voltage monitor indicates when  
the output is in regulation. The LTC3611 is available in a  
compact 9mm × 9mm QFN package.  
Q
ApplicAtions  
n
Point of Load Regulation  
Distributed Power Systems  
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Patents including 5481178, 6100678, 6580258, 5847554, 6304066.  
typicAl ApplicAtion  
High Efficiency Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
182k  
V
OUT  
V
I
0.1µF  
ON  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10000  
1000  
100  
10  
ON  
V
= 2.5V  
OUT  
V
IN  
4.5V TO 32V  
RUN/SS  
V
IN  
10µF  
×3  
V
IN  
= 5V  
100pF  
12.5k  
LTC3611  
V
IN  
= 25V  
1µH  
V
2.5V  
10A  
OUT  
SW  
680pF  
0.22µF  
100µF  
×2  
I
BOOST  
TH  
POWER LOSS,  
= 5V  
V
IN  
SGND INTV  
CC  
30.1k  
9.5k  
FCB  
POWER LOSS,  
39.2k  
11k  
V
= 25V  
IN  
4.7µF  
V
INTV  
CC  
RNG  
PGND  
1
PGOOD  
0.01  
0.1  
1
10  
EXTV  
CC  
V
FB  
LOAD CURRENT (A)  
3611 TA01b  
3611 TA01a  
3611fd  

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