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| 型号： | LTC3717EUH-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR STEP-DOWN SYNC 32QFN |
| 标准包装： | 73 |
| 应用： | 控制器，DDR，QDR |
| 输入电压： | 4 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3717-1
Wide Operating Range,
No R SENSE TM Step-Down Controller
for DDR/QDR Memory Termination
FEATURES
DESCRIPTIO
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V OUT = 1/2 V REF
Adjustable and Symmetrical Sink/Source
Current Limit up to 20A
True Current Mode Control with Optional Use of
Sense Resistor
V ON and I ON Pins Allow Constant Frequency
Operation During Input and Output Voltage Changes
± 0.65% Output Voltage Accuracy
Up to 97% Efficiency
Ultrafast Transient Response
2% to 90% Duty Cycle at 200kHz
t ON(MIN) ≤ 100ns
Stable with Ceramic C OUT
Power Good Output Voltage Monitor
Wide V IN Range: 4V to 36V
Adjustable Switching Frequency up to 1.5MHz
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Available in a 5mm × 5mm QFN Package
The LTC ? 3717-1 is a synchronous step-down switching
regulator controller for double data rate (DDR) and Quad
Data Rate TM (QDR TM ) memory termination. The controller
uses a valley current control architecture to deliver very
low duty cycles with or without a sense resistor. Operating
frequency is selected by an external resistor and is com-
pensated for variations in V IN and V OUT .
Forced continuous operation reduces noise and RF inter-
ference. Output voltage is internally set to half of V REF ,
which is user programmable.
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
V CC input.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation.
APPLICATIO S
QDR RAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress
Semiconductor, Hitachi, IDT, Micron Technology, Inc. and Samsung.
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Bus Termination: DDR and QDR Memory, SSTL,
HSTL, ...
Notebook Computers, Desktop Servers
Tracking/Margining Power Supply
TYPICAL APPLICATIO
I ON
V CC
5V TO 28V
1 μ F
0.1 μ F
V CC
V REF
RUN/SS TG
LTC3717-1
715k
V DD = 2.5V
Si7840DP
B320A
+
150 μ F
6.3V
× 2
V IN
2.5V TO 5.5V
100
90
80
Efficiency vs Load Current
V OUT = 1.25V
V IN = 5V
470pF
20k
I TH
SW
SENSE +
BOOST
0.22 μ F
0.68 μ H
+
V OUT
1.25V
180 μ F ± 10A
70
60
V IN = 2.5V
SGND
DRV CC
INTV CC
CMDSH-3
4V
× 2
50
40
V ON
BG
+
4.7 μ F
Si7840DP
B320A
30
20
PGOOD
PGND
SENSE –
10
V FB
37171 F01a
0
0
2
4
6
8
10
12
14
LOAD CURRENT (A)
Figure 1. High Efficiency DDR Memory Termination Supply
37171 F01b
sn37171 37171fs
1
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