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LTC3717EGN PDF预览

LTC3717EGN

更新时间: 2024-11-10 22:22:43
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路存储开关式控制器光电二极管双倍数据速率
页数 文件大小 规格书
20页 256K
描述
Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

LTC3717EGN 技术参数

是否Rohs认证:不符合生命周期:Transferred
零件包装代码:SSOP包装说明:SSOP, SSOP16,.25
针数:16Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.15Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
最大输入电压:36 V最小输入电压:4 V
标称输入电压:15 VJESD-30 代码:R-PDSO-G16
JESD-609代码:e0长度:4.8904 mm
湿度敏感等级:1功能数量:1
端子数量:16最高工作温度:70 °C
最低工作温度:最大输出电流:2 A
封装主体材料:PLASTIC/EPOXY封装代码:SSOP
封装等效代码:SSOP16,.25封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, SHRINK PITCH峰值回流温度(摄氏度):235
认证状态:Not Qualified座面最大高度:1.727 mm
子类别:Switching Regulator or Controllers表面贴装:YES
切换器配置:PUSH-PULL最大切换频率:1500 kHz
技术:CMOS温度等级:COMMERCIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:0.635 mm端子位置:DUAL
处于峰值回流温度下的最长时间:20宽度:3.899 mm
Base Number Matches:1

LTC3717EGN 数据手册

 浏览型号LTC3717EGN的Datasheet PDF文件第2页浏览型号LTC3717EGN的Datasheet PDF文件第3页浏览型号LTC3717EGN的Datasheet PDF文件第4页浏览型号LTC3717EGN的Datasheet PDF文件第5页浏览型号LTC3717EGN的Datasheet PDF文件第6页浏览型号LTC3717EGN的Datasheet PDF文件第7页 
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

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