DC1726A - Schematic

A
B
C
D
E
REVISION HISTORY
ECO
REV
__
RTR1
RTR3
OPT
SVIN
RSS1
VIN
3
4
5
6
TRACK
EXT SS
INT
4.7M
U1
LTC3618EUF
PGOOD1
VIN
2.25V - 5.5V
100k
E5
E6
CIN6
100uF
GND
18
VIN
+
CIN5
100uF
OPT
CIN4
22uF
6.3V
1206
+
CIN3
22uF
6.3V
1206
CIN2
22uF
6.3V
1206
21
22
CIN1
22uF
6.3V
1206
23
RFILT
24
CFILT
1uF
E7
9
10
3
E9
VIN
3
PGOOD2
16
7
100k
15
PGOOD1
ITH1
VDDQ
EXT REF
E11
05-24-11
PVIN1
FB1
VDDQ
EXT REF
1
2
3
4
SVIN
5
6
4
CITH1
470pF
0805
2
C1
10pF
FB2
PVIN2
SW2
PGOOD2
VDDQIN
RT
SW2
ITH2
COUT5
100uF
OPT
1
4
E3
845k 1%
GND
GND
E4
JP2
1.8V
422k
1%
R7
VOUT1 SELECT
JP3
2.5V
JP4
OPT
OPT
PVIN2
+
VDDQ
+/- 3A
R1
1.5V
562k
1%
R5
267k
1%
R9
SVIN
RUN2
JP1
R3
19
5
L2
3
11
1.0uH
COILCRAFT
XFL4020-102ME
12
6
10pF
E8
EXT
INT
3
1
COUT4
10uF
6.3V
0805
COUT2
47uF
6.3V
1210
JP10
COMP2
C2
RT
402K
JP13
VDDQIN
3
E2
COUT7
100uF
6.3V
OPT
1210
CFFW1 10pF
2
20
PVIN1
4
2
SW1
RUN1
1
RITH1
15.8k
1%
0805
1
JP12
ON
RUN2
OFF
13
RPG2
TRACK/SS1
PGND
14
SGND
RPG1
25
VIN
SW1
VTTR
ON
24
1
RUN1
2
EXT
8
3
0.01uF
OFF
DATE
FRAN H.
COUT3
10uF
6.3V
0805
COUT1
47uF
6.3V
1210
SVIN
JP9
COMP1
INT SS
17
CSS1
JP11
APPROVED
PRODUCTION
VDDQ
1.0uH
COILCRAFT
XFL4020-102ME
PHASE
4
DESCRIPTION
L1
JP5
TRACK / SS1
1
2
100k
MODE/SYNC
E1
3
TRACK1
2
COUT8
100uF
6.3V
OPT
1210
+
COUT6
100uF
OPT
E10
4
RITH2
10k
1%
0805
2
SVIN
VTT
+/- 3A
E12
CITH2
680pF
0805
GND
GND
VTTR
+/-10mA
C4
0.1uF
E13
C3
0.1uF
2
2
JP6
PHASE
180 deg
90 deg
IN PHASE
1
2
3
4
5
6
JP8
MODE
EXT SYNC
1
1
2 PSM
3
4 FCM
(FORCED CONTINUOUS)
5
6 EXT
(EXTERNAL SYNC)
(PULSE-SKIP)
E14
CUSTOMER NOTICE
NOTE: UNLESS OTHERWISE SPECIFIED
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
1. ALL RESISTORS ARE IN 0603.
ALL CAPACITORS ARE IN 0603.
APPROVALS
PCB DES.
TECHNOLOGY
JW
APP ENG.
FRAN H.
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
B
C
N/A
SCALE = NONE
D
DATE:
IC NO.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DUAL 3A MONOLITHIC SYNCHRONOUS
STEP-DOWN REGULATOR FOR DDR MEMORY
REV.
LTC3618EUF
DEMO CIRCUIT 1726A
Friday, July 29, 2011
2
SHEET 1
E
OF 1
1
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