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FDMS8680 Datasheet(PDF) 23 Page - Texas Instruments

Part # FDMS8680
Description  Complete DDR2, DDR3 and DDR3L Memory Power Solution Synchronous Buck
PDF  34 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

FDMS8680 Datasheet(HTML) 23 Page - Texas Instruments

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1
2
3
4
15
14
13
12
VTTSNS
U1
TPS51916RUK
VLDOIN
VTT
VTTGND
VBST
DRVH
SW
V5IN
5
11
VTTREF
DRVL
10
9
8
7
6
16
17
18
19
20
21
C6
1 mF
UDG-10195
C7
0.1 mF
C8
10 mF
C9
10 mF
C10
10 mF
VIN
8 V to 20 V
PGND
R6
0 W
C5
0.1 mF
R7 0 W
L1
0.56 mH
Q2
FDMS8670AS
Q3
FDMS8670AS
C11
330 mF
VDDQ_GND
PGND
R5
49 kW
R4
10 kW
C3
0.1 mF
C4
10 nF
C2
0.22 mF
C1
10 mF
C12
10 mF
PGND
VTT
0.75 V/2 A
VTTREF
0.75 V
VTTGND
S5
S3
R1
100 kW
R2 200 kW
R3 36 kW
V5IN
4.5 V to 5.5
V
Q1
FDMS8680
VDDQ
1.5 V/20 A
AGND
PGND
AGND
PGND
´
£
p ´
´
´
C
C
SW
X
OUT
R
C
f
2
G L
C
3
TPS51916
www.ti.com
SLUSAE1D – DECEMBER 2010 – REVISED JUNE 2012
where
•
RC×CC time constant is 23 µs for 500 kHz operation (or 14.6 µs for 670 kHz operation)
•
G = 0.25
(13)
TPS51916 Application Circuits
Figure 39. DDR3, D-CAP™ 400-kHz Application Circuit, Tracking Discharge
Table 3. DDR3, D-CAP™ 400-kHz Application Circuit, List of Materials
REFERENCE
QTY
SPECIFICATION
MANUFACTURE
PART NUMBER
DESIGNATOR
C8, C9, C10
3
10 µF, 25 V
Taiyo Yuden
TMK325BJ106MM
C11
1
330 µF, 2V, 6 m
Ω
Panasonic
EEFSX0D331XE
L1
1
0.56 µH, 21 A, 1.56 m
Ω
Panasonic
ETQP4LR56WFC
Q1
1
30 V, 35 A, 8.5 m
Ω
Fairchild
FDMS8680
Q2, Q3
2
30 V, 42 A, 3.5 m
Ω
Fairchild
FDMS8670AS
Copyright © 2010–2012, Texas Instruments Incorporated
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