DC652A - Schematic

A
B
C
D
E
REVISION HISTORY
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.
ECO
REV
DESCRIPTION
0
1st PROTOTYPE
1
2.5A to 3A
DATE
APPROVED
12/04/03
<APPROVED>
09/21/05
4
4
TP1
CIN3
+ 100uF
10V
2.25V-5.5Vin
TP2
GND
CFF
22pF
JP1
R2
RPG
100K
3
U1
LTC3412AEFE
TP3
PGOOD
C1
1
CITH 100pF
1000pF
J1
RITH
7.50K 1%
R3
R1
ROSC
75.0K
1%
110K
1%
309K 1%
BURST MODE
FORCE
CONTINUOUS
3
4
5
CSS
1000pF
CIN2
2.5V
16
PGOOD
SW
15
ITH
SW
14
VFB
PGND
13
RT
PGND
12
R6
(Opt)
SYNC/MODE
SW
11
7
RUN/SS
SW
10
SGND
PVIN
392K
1%
JP3
R5
L1
1uH
TOKO
A921CY-1R0M
CIN1
22uF
6.3V
3.3V
576K
1%
D1
(Optional)
9
3
JP2
R4
22uF
6.3V
PVIN
SVIN
6
8
RSS
1.0M
J2
2
2
1.8V
232K
1%
JP4
USER
SELECT
TP4
COUT1
100uF
6.3V
TDK
COUT2
10uF
6.3V
+
COUT3
100uF
(Optional)
Vout
3A
TP5
GND
ON
2
OFF
TP6
GND
PCB Layout
U1
R1
CIN2
RPG
R3
1
C1
CITH
RITH
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
ROSC
DRAWN: Rudy Bautista
L1
ENGINEER: Tom Gross
COUT1
RSS
CIN1
CSS
B
Title
APPROVED:
Size
CHECKED:
DCxxxA_00.PCB
A
LINEAR TECHNOLOGY CORPORATION
APPROVALS
C
xxxA_x.DSN
Date:
D
www.linear.com
1
LTC Confidential For Customer Use Only
3A Monolithic, Synchronous Step-Down Regulator
Document Number
Tuesday, May 05, 2009
Rev
Demo Circuit 652A
Sheet
1
E
1
of
1
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