DC1499A - Schematic

A
B
C
D
E
REVISION HISTORY
ECO
REV
DESCRIPTION
DATE
APPROVED
0
1st PROTOTYPE
<DATE>
<APPROVED>
4
4
*
CIN1 & R4 ARE OPTIONAL COMPONENTS. THEY ARE INSERTED
ON THE DC1499A TO DAMPEN THE (POSSIBLE)
RINGING VOLTAGE DUE TO THE LONG INPUT LEADS.
ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES,
THIS COMPONENTS ARE NOT NEEDED.
U1
LTC3631EDD
E1
2
VIN
4.5V - 45V
CIN
4.7uF
50V
1210
R4
4.7 Ohm
*
5
7
3
CIN1
0.22uF
100V
*
E2
4
GND
VIN
RUN
VFB
HYST
ISET
SS
CSS
0.047uF
R1
2M
SW
GND
GND
1
6
L1
100uH
E3
SLF6028T-101MR42-PF
TDK
COUT
47uF
6.3V
1206
3
VOUT
100mA(max)
COUT2 COUT1
47uF
0.1uF
6.3V
16V
1206
E4
GND
3
8
CFFW
RSET
(Opt)
E5
9
(Opt)
SGND
RFB1
1.47M
1%
RUN
1
ON
R2
2
2
(Opt)
3
OFF
RFB2
1.18M
1%
JP4
5V
JP3
3.3V
JP2
1.8V
2
APPROVALS
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice:Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customers 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
Applications Engineering for assistance.
A
RFB3
475K
1%
R3
0 Ohm
JP1
1
RFB4
280K
1%
B
DRAWN: Rudy Bautista
ENGINEER: Chuen Ming Tan
APPROVED:
CHECKED:
Date:
C
Thursday, February 26, 2009
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
Title: LTC3631EDD
www.linear.com
LTC Confidential 1
For Customer Use Only
High Efficiency 100mA Monolithic Synchronous Buck Regulator
SD
Document Number
C:\ORCADWIN\CAPTURE\1499A\1499A_REV0.DSN
D
Rev
Demo Circuit 1499A
Sheet
E
1
0
of
1
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