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參數(shù)資料
| 型號： | LTC3717 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination |
| 中文描述： | 寬工作，無檢測電阻步幅度型控制器用于DDR / QDR存儲器終端 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 255K |
| 代理商： | LTC3717 |
1
LTC3717
sn3717 3717fs
Wide Operating Range,
No R
SENSE
for DDR/QDR Memory Termination
DESCRIPTIO
U
TM
Step-Down Controller
I
V
OUT
= 1/2 V
IN
(Supply Splitter)
I
Adjustable and Symmetrical Sink/Source
Current Limit up to 20A
I
±
0.65% Output Voltage Accuracy
I
Up to 97% Efficiency
I
No Sense Resistor Required
I
Ultrafast Transient Response
I
True Current Mode Control
I
2% to 90% Duty Cycle at 200kHz
I
t
ON(MIN)
≤
100ns
I
Stable with Ceramic C
OUT
I
Dual N-Channel MOSFET Synchronous Drive
I
Power Good Output Voltage Monitor
I
Wide V
CC
Range: 4V to 36V
I
Adjustable Switching Frequency up to 1.5MHz
I
Output Overvoltage Protection
I
Optional Short-Circuit Shutdown Timer
I
Available in a 16-Pin Narrow SSOP Package
APPLICATIOU
I
Bus Termination: DDR and QDR Memory, SSTL,
HSTL, ...
I
Notebook Computers, Desktop Servers
I
Tracking Power Supply
The LTC
3717 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 without requiring a sense resistor. Oper-
ating frequency is selected by an external resistor and is
compensated for variations in V
IN
.
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
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.
Figure 1. High Efficiency DDR Memory Termination Supply
Efficiency vs Load Current
+
D
CMDSH-3
D1
B320A
L1
0.68
μ
H
C
VCC
4.7
μ
F
C
IN
150
μ
F
6.3V
×
2
V
2.5V TO 5.5V
V
1.25V
±
10A
+
+
C
OUT
180
μ
F
4V
×
2
M2
Si7840DP
3717 F01a
M1
Si7840DP
R
ON
715k
C
SS
0.1
μ
F
I
ON
V
REF
TG
SW
BOOST
RUN/SS
I
TH
SGND
INTV
CC
BG
PGND
V
FB
PGOOD
C
B
0.22
μ
F
R
C
20k
LTC3717
C
470pF
1
μ
F
V
CC
V
CC
5V TO 28V
D2
B320A
V
DD
= 2.5V
LOAD CURRENT (A)
0
E
3717 F01b
100
90
80
70
60
50
40
30
20
10
0
2
4
6
8
10
12
14
V
IN
= 2.5V
V
IN
= 5V
V
OUT
= 1.25V
FEATURES
TYPICAL APPLICATIO
U
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| LTC3717-1#PBF | 制造商:LINEAR 功能描述: 制造商:Linear Technology 功能描述: |
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| LTC3717EGN#PBF | 功能描述:IC STEP-DWN CONTRLR SYNC 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| LTC3717EGN#TR | 功能描述:IC STEP-DWN CONTRLR SYNC 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3717EGN#TRPBF | 功能描述:IC STEP-DWN CONTRLR SYNC 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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