DC734A - Schematic

5
4
3
2
1
* Capacitor C5 is an optional part. It was inserted on the DC734 to dampen the (possible) ringing voltage
due to the use of long input leads. On a normal, typical PCB, with short traces, the capacitor is not
needed.
Vin
Vin
2.5V-5.5V
JP1
CH.1
On
2
Off
Gnd
On
2
R1
4.7M
5%
U1
LTC3407-2EDD
R2
100K
R3
4.7M
5%
Off
VIN
1
E5
JP2
CH.2
1
Cin
10uF
6.3V
3
D
C5*
+ 47uF
10V
(Opt.)
3
E1
3
D
Vout1
1.2V/1.5V/1.8V
@ 800mA
R4
604K
RUN2
9
R5
604K
R8
402K
SW2
1
FBK1
11
GND
R9
301K
5
2
4
6
+
+
+
Vin
1
3
5
7
C2
22pF
FBK2
C
Vout2
2.5V @ 800mA
R6
887K
Cout2
10uF
6.3V
C4
(Opt.)
10
E3
Gnd
R7
280K
E6
R10
4.7M
5%
B
2
JP3
Vout1
E7
L2
2.2uH
C1
22pF
+
+
+
B
POR
MODE/SYNC
Cout1
10uF
6.3V
1.2V
1.5V
1.8V
E4
SW1
L1
2.2uH
C3
(Opt.)
Gnd
4
POR
8
6
E2
RUN1
GND
C
2
3
JP4
1
Burst Pulse
Mode Skip
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Customer Notice
A
5
4
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
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:
Wednesday, June 23, 2004
3
Title
A
Dual Synchronous Step-Down DC/DC Converter
Rev
Demo Circuit 734A LTC3407-2EDD
2
Sheet
1
1
of
1
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