DC1863A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
__
REV
DESCRIPTION
2
APPROVED
DATE
TOM G.
11-29-12
PRODUCTION
D
D
LTC3621EMS8E
U1
2
VIN
E1
C1A
8.2uF
25V
+
C1
10uF
1
VIN
2.7V - 17V
1
2
3
FB
3
6
B
MODE/SYNC (Forced Continuous)
PS (Pulse-Skip)
1
CFF
22pF
C4
1uF
R3
619k
PGOOD
INTVCC
MODE/SYNC
7
C2
22uF
5
R4
309k
R5
196k
R6
137k
R7
84.5k
JP3
JP4
JP5
JP6
JP7
1.2V
1.8V
2.5V
3.3V
5.0V
GND SGND
9
C3
22uF
R8
OPT
JP8
USER
SELECT
8
2
JP2
3
BM (Burst Mode)
1A
C
4
R2
100k
OPT
E2
RUN
RUN
E8
E7
VOUT
VOUT
4.7uH
Rpgood
100k
INTVCC
L1
Rset
619k
OFF
PGOOD
SW
JP1
ON
C
VIN
GND
B
E4
R1
100k
OPT
E6
GND
SYNC
E5
GND
E3
CUSTOMER NOTICE
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.
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
APPROVALS
PCB DES.
TECHNOLOGY
HZ
APP ENG. TOM G.
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
17V VIN SYNCHRONOUS STEP-DOWN REGULATOR
WITH ULTRA-LOW QUIESCENT CURRENT
SIZE
IC NO.
N/A
SCALE = NONE
REV.
LTC3621EMS8E
DEMO CIRCUIT 1863A
2
Thursday, June 13, 2013
DATE:
2
SHEET 1
1
OF 1
A
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