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MAX1809

更新时间： 2023-12-20 18:45:34
品牌 Logo 应用领域
亚德诺 - ADI 双倍数据速率存储
页数 文件大小 规格书
17页 803K
描述
3A、1MHz、DDR存储器端接电源

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中文翻译

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MAX1809 数据手册

 浏览型号MAX1809的Datasheet PDF文件第2页浏览型号MAX1809的Datasheet PDF文件第3页浏览型号MAX1809的Datasheet PDF文件第4页浏览型号MAX1809的Datasheet PDF文件第5页浏览型号MAX1809的Datasheet PDF文件第6页浏览型号MAX1809的Datasheet PDF文件第7页 
19-2142; Rev 1; 9/02  
3A, 1MHz, DDR Memory Termination Supply  
General Description  
Features  
The MAX1809 is a reversible energy flow, constant-off-  
time, pulse-width modulated (PWM), step-down DC-DC  
converter. It is ideal for use in notebook and subnote-  
book computers that require 1.1V to 5V active  
termination power supplies. This device features an  
internal PMOS power switch and internal synchronous  
rectifier for high efficiency and reduced component  
count. The internal 90mΩ PMOS power switch and  
70mΩ NMOS synchronous-rectifier switch easily deliver  
continuous load currents up to 3A. The MAX1809 accu-  
rately tracks an external reference voltage, produces  
o Source/Sink 3A  
o ±±1 ꢀuꢁtuꢁ Accurꢂcꢃ  
o Ut ꢁo ±MHz Swiꢁching Frequencꢃ  
o 931 Efficiencꢃ  
o Inꢁernꢂl PMꢀS/NMꢀS Swiꢁches  
90mΩ/70mΩ ꢀn-Resisꢁꢂnce ꢂꢁ V = 4.5V  
±±0mΩ/80mΩ ꢀn-Resisꢁꢂnce ꢂꢁ V = 3V  
IN  
IN  
o ±.±V ꢁo V Adjusꢁꢂble ꢀuꢁtuꢁ Volꢁꢂge  
IN  
an adjustable output from 1.1V to V  
efficiencies as high as 93%.  
and achieves  
IN,  
o 3V ꢁo 5.5V Intuꢁ Volꢁꢂge Rꢂnge  
o <±µA Shuꢁdown Suttlꢃ Currenꢁ  
o Progrꢂmmꢂble Consꢁꢂnꢁ-ꢀff-Time ꢀterꢂꢁion  
o Thermꢂl Shuꢁdown  
The MAX1809 uses a unique current-mode, constant-  
off-time, PWM control scheme that allows the output to  
source or sink current. This feature allows energy to  
return to the input power supply that otherwise would  
be wasted. The programmable constant-off-time archi-  
tecture sets switching frequencies up to 1MHz, allowing  
the user to optimize performance trade-offs between  
efficiency, output switching noise, component size, and  
cost. The MAX1809 features an adjustable soft-start to  
limit surge currents during startup, a 100% duty-cycle  
mode for low-dropout operation, and a low-power shut-  
down mode that disables the power switches and  
reduces supply current below 1µA. The MAX1809 is  
available in a 28-pin QFN with an exposed backside  
pad, a 28-pin thin QFN, or a 16-pin QSOP.  
o Adjusꢁꢂble Sofꢁ-Sꢁꢂrꢁ Inrush Currenꢁ Limiꢁing  
o ꢀuꢁtuꢁ Shorꢁ-Circuiꢁ Proꢁecꢁion  
Ordering Information  
PART  
MAX1809EGI*  
MAX1809EEE  
MAX1809ETI  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
28 QFN  
16 QSOP  
28 Thin QFN  
*Contact factory for availability.  
Applications  
DDR Memory Termination  
Active Termination Buses  
Pin Configurations  
TOP VIEW  
Typical Operating Circuit  
N.C.  
IN  
PGND  
PGND  
LX  
1
2
3
4
5
6
7
21  
20  
19  
18  
17  
16  
15  
V
V
OUT  
IN  
IN  
LX  
LX  
MAX1809  
PGND  
GND  
IN  
LX  
MAX1809  
V
CC  
N.C.  
PGND  
FB  
REF  
SS  
SHDN  
V
CC  
SS  
V
SET  
EXTREF  
EXTREF  
GND  
TOFF  
THIN QFN  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
±
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...17

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与MAX1809相关器件

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MAX1809EEE MAXIM

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 		3A, 1MHz, DDR Memory Termination Supply
MAX1809EEE+ MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, PDSO16, QSOP-16
MAX1809EEE+T MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, PDSO16, QSOP-16
MAX1809EEE-T MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, PDSO16, QSOP-16
MAX1809EGI MAXIM

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 		SMPS Controller
MAX1809EGI-T MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, CQCC28, QFN-28
MAX1809ETI MAXIM

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 		3A, 1MHz, DDR Memory Termination Supply
MAX1809ETI+ MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, CQCC28, TQFN-28
MAX1809ETI+T MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, CQCC28, TQFN-28
MAX1809ETI-T MAXIM

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 		Switching Regulator, Current-mode, 4.7A, 1000kHz Switching Freq-Max, CQCC28, TQFN-28

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