DC1677A - Schematic

1
2
REVISION HISTORY
ECO
REV
__
E7
DATE
YING C.
11-9-11
C1 JP1
2.2uF 2
100V
1210
U1
ON
R1
(OPT)
1%
0603
OFF
E1
16
5
E11
TRACK/SS1
C3 1nF
JP2
SYNC
2
12
RT
3
3
E6
SYNC
E2
L1
22uH
C5
0.22uF
0603
1
VOUT1
5V / 1A
D1
DFLS160L
14
VIN1
VIN2
TRACK/SS2
EN/UVLO
RT
E9 VIN2
9
10
13
R2
200K
1%
TRACK/SS1
SYNC
BD
BOOST1
BOOST2
SW1
SW2
C4
1nF
C2
2.2uF
100V
1210
+
7V - 60V
C14
22uF
100V
OPT
E10
GND
4
DA1
FB1
C7 (OPT)
DA2
FB2
A
E12
TRACK/SS2
6
C6
0.22uF
0603
7
L2 15uH
E3
VOUT2
3.3V / 1A
8
11
D2
DFLS160L
C8
22pF
R5
34k
C10
47uF
10V
1210
C12
1uF
10V
0603
17
C9
47uF
10V
1210
2
1
2
C11
1uF
10V
0603
15
1
R3
(OPT)
1%
0603
LT3988EMSE
1
GND
EN/UVLO
PRODUCTION
2
E8
C13
22uF
100V
OPT
GND
+
1
7V - 60V
A
2
APPROVED
VIN1
3
VIN1
DESCRIPTION
R4 57.6k
E5
E4
GND
B
GND
R7
10k
R6
10.2K
1%
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN 0402.
ALL CAPACITORS ARE IN 0402.
B
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
2. INSTALL SHUNTS AS SHOWN.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
TECHNOLOGY
HZ
YING C.
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
DUAL 60V STEP-DOWN REGULATOR
SIZE
IC NO.
LT3988EMSE
N/A
DEMO CIRCUIT 1677A
DATE:
Tuesday, March 27, 2012
2
SHEET 1
REV.
2
OF 1
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