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LTC3309A

更新时间： 2024-11-10 02:53:03
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
26页 2795K
描述
8V, 16A Synchronous Step-Down Silent Switcher 2

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中文翻译

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LTC3309A 数据手册

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LTC3311  
5V, 12.5A Synchronous Step-Down  
Silent Switcher in 3mm x 3mm LQFN  
FEATURES  
DESCRIPTION  
The LTC®3311 is a very small, low noise, monolithic  
step-down DC/DC converter capable of providing up to  
12.5A of output current from a 2.25V to 5.5V input supply.  
The device employs Silent Switcher 1 architecture with  
internal hot loop bypass capacitors to achieve both low  
EMI and high efficiency at switching frequencies as high  
as 5MHz. For systems with higher power requirements,  
multi-phasing parallel converters is readily implemented.  
n
Pin Compatible with LTC3310/LTC3310S and LTC3311S  
Silent Switcher® Architecture:  
n
n
Ultralow EMI Emissions  
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n
n
n
n
n
n
n
n
n
n
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High Efficiency—4.5mΩ NMOS and 16mΩ PMOS  
Wide Bandwidth, Fast Transient Response  
Safely Tolerates Inductor Saturation in Overload  
V Range: 2.25V to 5.5V  
IN  
OUT  
OUT  
V
V
Range: 0.5V to V  
IN  
Accuracy: 1% with Remote Sense  
The LTC3311 uses a constant frequency, peak current  
mode control architecture for fast transient response. A  
500mV reference allows for low voltage outputs. 100%  
duty cycle operation delivers low drop out.  
Peak Current Mode Control  
Minimum On-Time: 35ns  
Programmable Frequency to 5MHz  
Precision 400mV Enable Threshold, 1μA in Shutdown  
Output Soft-Start with Voltage Tracking  
Power Good Output  
Die Temperature Monitor  
Configurable for Paralleling Power Stages in Forced  
Continuous Mode  
Other features include a power good signal when the  
output is in regulation, precision enable threshold, output  
overvoltage protection, thermal shutdown, a temperature  
monitor, clock synchronization, mode selection and  
output short circuit protection. The device is available in  
a compact 18-lead 3mm x 3mm LQFN package.  
n
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Thermally-Enhanced 3mm × 3mm LQFN Package  
AEC-Q100 Qualified for Automotive Applications  
All registered trademarks and trademarks are the property of their respective owners.  
APPLICATIONS  
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Automotive/Industrial/Communications  
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Servers, Telecom Power Supplies  
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Distributed DC Power Systems (POL)  
FPGA, ASIC, µP Core Supplies  
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TYPICAL APPLICATION  
Efficiency vs Load Current  
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ꢀ0  
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ꢀ0  
ꢀ0  
ꢀ0  
0
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ꢀ.0  
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0.ꢀ  
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0
1.2V 12.5A Step-Down Converter  
ꢀ
ꢀ ꢁꢂꢃꢄ ꢅꢆꢇꢈꢉ ꢃꢊꢂꢋ0ꢌ0 ꢍꢎꢎꢌꢋ0ꢌ00ꢏ0  
ꢀꢁ  
V
ꢀꢁꢁꢂꢃꢂꢀꢄꢃꢅ  
IN  
3.0V to 5.5V  
22µF  
22µF  
V
IN  
EN  
MODE/SYNC  
100nH  
V
OUT  
SW  
FB  
1.2V  
12.5A  
47µF  
140k  
100k  
6.8pF  
LTC3311  
PGND  
PGOOD  
SSTT  
×3  
ꢀꢁꢂꢃR ꢄꢁꢅꢅ  
V
IN  
1μF  
0.1µF  
AGND  
RT  
ꢀ
ꢀ ꢁ.ꢁꢂ  
ꢀꢁ  
ITH  
ꢀ
ꢀ ꢁ.ꢂꢃ  
ꢀꢁꢂ  
10k  
470pF  
ꢀ
ꢀ ꢁꢂꢃꢄ  
ꢀꢁꢂ  
274k  
0
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ0 ꢀꢁ ꢀꢁ  
3311 TA01a  
ꢀꢁꢂ  
ꢀꢀꢁꢁ ꢂꢃ0ꢁꢄ  
Rev. 0  
1
Document Feedback  
For more information www.analog.com  
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