DC878A - Schematic

A
B
C
D
E
NOTES:
Vin
L1
4.7uH
A915AY-4R7M
2V - 5V
C1
4.7uF, 6.3V
X5R
2
R9
1K
3
Off
SHDN
4
SHDN
3
SYNC
8
COMP
13
5V *
GND
U1
LTC3458LEDE
JP1
Output
On
E3
Vout
1
C9 **
47uF, 10V
TANT
1
Gnd
4
SW
+
2
E1
VIN
4
UNLESS OTHERWISE SPECIFIED
VOUT
Center Pad
FB
12
R2
665K
1%
C2
27pF
NPO
C3
22uF, 6.3V
X5R
E2
C4
0.1uF
7
3
3
R8
100K
1%
R4
33.2K
1%
R1
1M
1%
C7
10pF
NPO
Gnd
C5
0.01uF
X7R
GND
R10
51K
9
ILIM
5
R5
200K
1%
11
R6
84.5K
1%
R7
133K
1%
C6
0.01uF, 16V
X7R
R3
215K
1%
1
E5
6
10
Sync
RT
SS
E4
BURST
C8
470pF
NPO
Fixed Freq.
2
Burst Mode
3
2
JP2
Mode Selector
2
Auto On
4
E6
** C9 Used Only When Operating Supply With Long Inductive Input Leads.
*
Vin
1
2V
300mA
2.7V
450mA
3.3V
650mA
4.2V
900mA
A
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Iout at 5V
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.
B
C
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
Title
1
1MHz Synchronous Step-Up DC/DC Converter
Size
Document Number
Date:
Wednesday, July 13, 2005
Demo Circuit 878A
D
Sheet
LTC3458LEDE
1
E
of
1
Rev
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