DC701A - Schematic

5
4
3
2
1
* Capacitor C5 is an optional part. It was inserted on the DC701 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
2.5V-5.5V
JP1
CH.1
On
2
Off
Gnd
On
2
R1
4.7M
5%
U1
LTC3407EDD
R2
100K
R3
4.7M
5%
Off
VIN
1
E5
JP2
CH.2
3
Cin
10uF
6.3V
1
C5*
+ 47uF
10V
(Opt.)
D
3
E1
Vin
3
D
R4
604K
RUN2
9
R5
604K
R8
402K
SW2
1
FBK1
11
GND
R9
301K
C
Vout2
2.5V @ 600mA
5
2
4
6
C2
10pF
FBK2
R6
887K
Cout2
10uF
6.3V
C4
(Opt.)
10
E3
Gnd
R7
280K
E6
B
2
Vin
7
R10
4.7M
5%
1
3
5
+
+
+
JP3
Voltage Select
E7
L2
2.2uH
C1
10pF
+
+
+
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
Vout1
1.2V/1.5V/1.8V
@ 600mA
2
3
JP4
1
Burst Pulse
Mode Skip
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Customer Notice
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.
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
A
5
4
3
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
A
Title
Dual Synchronous Step-Down DC/DC Converter
Size
Document Number
Date:
Monday, November 10, 2003
Demo Circuit 701A
2
LTC3407EDD
Sheet
1
1
of
1
Rev
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