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LTC3717EGN#PBF PDF预览

LTC3717EGN#PBF

更新时间： 2024-01-18 21:22:52
品牌 Logo 应用领域
凌特 - Linear 存储双倍数据速率控制器
页数 文件大小 规格书
20页 256K
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LTC3717EGN#PBF 数据手册

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LTC3717  
Wide Operating Range,  
No RSENSETM Step-Down Controller  
for DDR/QDR Memory Termination  
U
DESCRIPTIO  
FEATURES  
The LTC®3717 is a synchronous step-down switching  
regulator controller for double data rate (DDR) and Quad  
Data RateTM (QDRTM) memory termination. The controller  
uses a valley current control architecture to deliver very  
low duty cycles without requiring a sense resistor. Oper-  
ating frequency is selected by an external resistor and is  
compensated for variations in VIN.  
■
VOUT = 1/2 VIN (Supply Splitter)  
■
Adjustable and Symmetrical Sink/Source  
Current Limit up to 20A  
■
±0.65% Output Voltage Accuracy  
■
Up to 97% Efficiency  
■
No Sense Resistor Required  
■
Ultrafast Transient Response  
■
True Current Mode Control  
Forced continuous operation reduces noise and RF inter-  
ference. Output voltage is internally set to half of VREF  
which is user programmable.  
■
2% to 90% Duty Cycle at 200kHz  
,
■
t
ON(MIN) ≤ 100ns  
■
■
■
■
■
■
■
■
Stable with Ceramic COUT  
Dual N-Channel MOSFET Synchronous Drive  
Power Good Output Voltage Monitor  
Wide VCC Range: 4V to 36V  
Adjustable Switching Frequency up to 1.5MHz  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Fault protection is provided by an output overvoltage  
comparator and optional short-circuit shutdown timer.  
Soft-start capability for supply sequencing is accom-  
plished using an external timing capacitor. The regulator  
current limit level is symmetrical and user programmable.  
Wide supply range allows operation from 4V to 36V at the  
VCC input.  
Available in a 16U-Pin Narrow SSOP Package  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
No RSENSE is a trademark of Linear Technology Corporation.  
QDR RAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress  
Semiconductor, Hitachi, IDT, Micron Technology, Inc. and Samsung.  
APPLICATIO S  
■
Bus Termination: DDR and QDR Memory, SSTL,  
HSTL, ...  
■
Notebook Computers, Desktop Servers  
Tracking Power Supply  
■
U
TYPICAL APPLICATIO  
V
CC  
5V TO 28V  
Efficiency vs Load Current  
R
ON  
715k  
1µF  
V
V
IN  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
CC  
I
ON  
V
= 1.25V  
OUT  
2.5V TO 5.5V  
+
+
C
IN  
V
DD  
= 2.5V  
V
REF  
TG  
150µF  
6.3V  
×2  
V
IN  
= 5V  
M1  
D2  
RUN/SS  
Si7840DP  
B320A  
V
= 2.5V  
C
IN  
C
C
SS  
0.1µF  
V
SW  
OUT  
470pF  
1.25V  
C
B
0.22µF  
L1  
0.68µH  
C
OUT  
I
BOOST  
±10A  
TH  
D
180µF  
4V  
B
R
C
LTC3717  
SGND INTV  
CMDSH-3  
20k  
×2  
CC  
M2  
Si7840DP  
D1  
B320A  
BG  
+
C
VCC  
4.7µF  
PGOOD PGND  
0
2
4
6
8
10  
12  
14  
V
FB  
3717 F01a  
LOAD CURRENT (A)  
3717 F01b  
Figure 1. High Efficiency DDR Memory Termination Supply  
sn3717 3717fs  
1
1234567...20

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LTC3717EGN#PBF 替代型号

型号 品牌 替代类型 描述 数据表
LTC3717EGN#TRPBF Linear

完全替代

 LTC3717 - Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Terminat

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