DC1429A - Schematic

A
B
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D
E
REVISION HISTORY
ECO
REV
DESCRIPTION
0
1st PROTOTYPE
DATE
APPROVED
<DATE>
<APPROVED>
4
4
& R4 ARE OPTIONAL COMPONENTS. THEY ARE INSERTED
* CIN1
ON THE DC1429A 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
LTC3642EDD
E1
2
VIN
4.5V - 45V
CIN
2.2uF
50V
1210
R4
4.7 Ohm
*
5
7
3
CIN1
0.22uF
100V
*
E2
4
GND
VIN
RUN
VFB
HYST
ISET
SS
CSS
6800pF
R1
2M
SW
GND
GND
1
L1
100uH
VLCF5020T-101MR27
E3
COUT
10uF
6.3V
1206
TDK
6
VOUT
50mA(max)
COUT1
0.1uF
16V
E4
GND
3
3
8
CFFW
RSET
(Opt)
E5
9
(Opt)
SGND
RFB1
1.47M
1%
E6
SGND
RUN
1
ON
R2
2
2
(Opt)
3
OFF
RFB4
280K
1%
RFB3
475K
1%
RFB2
1.18M
1%
JP4
5V
JP3
3.3V
JP2
1.8V
R3
0 Ohm
JP1
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.
1
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DRAWN: Rudy Bautista
ENGINEER:
APPROVED:
CHECKED:
Date:
C
Tom Gross
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
Title: LTC3642EDD
www.linear.com
LTC Confidential For Customer Use Only
High Efficiency 50mA Monolithic Synchronous Buck Regulator
SD
Document Number
Thursday, September 11, 2008 C:\ORCADWIN\CAPTURE\1429A\1429A_REV1.DSN
D
Rev
Demo Circuit 1429A
Sheet
E
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of
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