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LTC3413IFE-PBF

更新时间： 2024-11-09 12:19:15
品牌 Logo 应用领域
凌特 - Linear 稳压器存储双倍数据速率
页数 文件大小 规格书
16页 259K
描述
3A, 2MHz Monolithic Synchronous Regulator for DDR/QDR Memory Termination

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LTC3413  
3A, 2MHz Monolithic  
Synchronous Regulator for  
DDR/QDR Memory Termination  
FEATURES  
DESCRIPTION  
The LTC®3413 is a high efficiency monolithic synchro-  
nous step-down DC/DC converter utilizing a constant  
n
High Efficiency: Up to 90%  
n
±±3 ꢀutput ꢁurrent  
n
Symmetrical Source and Sink ꢀutput ꢁurrent Limit  
frequency, current mode architecture. It operates from  
an input voltage range of 2.25V to 5.5V and provides a  
regulatedoutputvoltageequalto(0.5)V whilesourcing  
or sinking up to 3A of output current. An internal voltage  
divider reduces component count and eliminates the need  
for external resistors by dividing the reference voltage in  
half. The internal synchronous power switch with 85mΩ  
on-resistanceincreasesefficiencyandeliminatestheneed  
for an external Schottky diode. Switching frequencies up  
to 2MHz are set by an external resistor.  
n
n
n
n
n
n
n
n
n
Low R  
Internal Switch: 85mΩ  
DS(ꢀN)  
No Schottky Diode Required  
REF  
2.25V to 5.5V Input Voltage Range  
V
= V /2  
OUT  
REF  
1ꢀ Output Voltage Accuracy  
Programmable Switching Frequency: Up to 2MHz  
Power Good Output Voltage Monitor  
Overtemperature Protected  
Available in 16-Lead TSSOP Exposed Pad Package  
Forced-continuous operation in the LTC3413 reduces  
noise and RF interference. Fault protection is provided  
by an overcurrent comparator that limits output current  
during both sourcing and sinking operations. Adjustable  
compensationallowsthetransientresponsetobeoptimized  
over a wide range of loads and output capacitors.  
APPLICATIONS  
n
™
Bus Termination: DDR and QDR Memory,  
SSTL, HSTL, ...  
n
n
Notebook Computers  
Distributed Power Systems  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 5481178.  
TYPICAL APPLICATION  
V
100  
IN  
V
= 2.5V  
2.5V  
IN  
22μF  
90  
80  
70  
f = 1MHz  
SV  
PV  
IN  
IN  
L1  
0.47μH  
PGOOD  
SW  
V
OUT  
60  
50  
1.25V  
3A  
V
REF  
C
OUT  
4.7M  
330pF  
LTC3413  
100μF  
s2  
RUN/SS  
PGND  
SGND  
40  
30  
20  
10  
0
5.11k  
I
TH  
R
V
FB  
T
2200pF  
3413 F01a  
309k  
0.01  
0.1  
1
10  
L1: VISHAY DALE IHLP-2525CZ-01 0.47  
: TDK C4532X5R0J107M  
C
LOAD CURRENT (A)  
OUT  
3413 F01b  
Figure 1a. High Efficiency Bus Termination Supply  
Figure 1b. Efficiency vs Load ꢁurrent  
3413fc  
1
1234567...16

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