DC1445A - Schematic

5
4
15
PVin
8
RUN
2
12
Vfb
6
D1
Opt.
E8
RFB5
845K
1%
COUT1
0.1uF
GND
JP3
5V
RFB2
187K
1%
GND
E5
2
2
JP2
3.3V
RFB1
267K
1%
RTR1
255K
CFFW
10pF
C
JP4
Opt.
1
JP1
2.5V
EXT SS
INT SS
TRACK
RFB3
115K
1%
B
RFB4
Opt.
RTR2
200K
Customer Notice
* Capacitor CIN1 Is An Optional Capacitor.
It Is Inserted On The DC1445A To Dampen
The (Possible) Ringing Voltage Due To The
Long Input Leads. On A Normal, Typical
PCB, With Short Trace, The Capacitor Is
Not Needed.
5
2
RSET
105K
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
A
COUT
100uF
6.3V
E4
B
TRACK
VOUT
2.5A Max
E3
1
2
4
6
SW
1
1
3
5
13
L1
3.3uH
Vishay
IHLP-2525CZ-01
1
CSS
0.1uF
JP7
TRACK
SW
CBST
0.22uF
2
Ith
RC
4.32K
CC
1000pF
3
Track/SS
4
CC1
Opt.
14
DBST
CMDSH-3
2
5
CST
1uF
1
Sync/Mode
9
RSD
4.7M
Boost
2
1
PGnd
JP5
VOUT ENABLE
1
ON
2
OFF
3
C
INTVcc
1
PVin
PGnd
E2
16
PGOOD
17
CIN
22uF
25V
CIN2
0.1uF
16V
Opt.
PGood
*
CIN1
2.2uF
35V
11
GND
U1
LTC3603EMSE
SGnd
E1
D
E7
7
E6
VIN
4V - 15V
RPG
100K
FC (FORCED CONTINUOUS)
BM (BURST MODE)
SYNC
PS (PULSE-SKIP)
PGnd
JP6
MODE/SYNC
1
2
3
4
5
6
7
8
Rt
SYNC
1
RBM1
845K
CBM
0.1uF
10V
Opt.
D
2
10
RBM2
137K
3
4
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
www.linear.com
408-434-0507 FAX
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.
Size
Document Number
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
Date:
Friday, February 13, 2009
3
A
LTC3603EMSE
Title
High Input Voltage 2.5A Monolithic Synchronous Buck Regulator
2
Rev
A
Demo Circuit 1445A
Sheet
1
1
of
1