DC1276B - Schematic

4
3
2
1
VCC
E1
VCC
4.35V - 5.5V
J1
4
E17
VBUS
1
D-
2
D+
3
ID
4
GND
5
USB
TP1
DTP2
D+
TP3
ID
E2
C10
1
10V
C1
10
6.3V
0603
LTC3558EUD
20
VCC
R1
1.0
5%
CHRG
E3
16
HPWR
2
PVIN1
7
PVIN2
8
C8
22
6.3V
0805
SW1
100%
20%
R16
324K
SUSP
JP2
SUSP
17
CHARGER
ON
OFF
FB1
R4
100K
0
R5
ENTC
INT
EXT
0
18
VOUT2
11
SWAB2
9
PROG
L2
2.2uH
1072AS-2R2M
E6
PROG
2
5
EN1
15
EN2
EN1
JP4
EN1
OFF
BAT
R7
1.0M
3
SWCD2
10
MODE
21
FB2
13
VC2
GND
14
1
OFF
1
ON
E9
330pF 15k
R11
105k
C2
10pF
MODE
E10
GND
JP6
MODE
0
R9
1.0M
1
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
MODE
1
0
JP6 settings
BUCK
BUCK-BOOST
BURST
BURST
PULSE SKIP
PWM
Unless noted:
Resistors: Ohms, 0402, 1%, 1/16W
Capacitors: uF, 0402, 10%, 50V
CONTRACT NO.
APPROVALS
TECHNOLOGY
DRAWN:
G. Barbehenn
CHECKED:
TITLE:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SCHEMATIC
LTC3558EUD: Linear USB Battery Charger with Buck
and Buck-Boost Regulators
APPROVED:
ENGINEER:
G. Barbehenn SIZE
DESIGNER:
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
E11
GND
2
R10
CUSTOMER NOTICE
E12
VOUT2
3.3V
400mA
R13
121k
EN2
R8
1.0M
3
TP4
E8
JP5
EN2
GND
C4
33pF
R12
324k
C3
GND
ON
E13
C5
22
6.3V
0805
R14
20
5%
R6
1.74K
E7
C7
10
6.3V
0603
R15
649K
R2
100K
JP3
NTC
C6
22pF
4
NTC
E5
R3
E15
GND
E14
VOUT1
1.2V
400mA
6
1098AS-4R7M
12
BAT
GND
ENTC
DF3-3P-2DSA
ENTC
L1
4.7uH
E4
NTC
R17
1.0
5%
1
2
3
4
HPWR
JP1
HPWR
3
E16
BAT
FLOAT=4.2V
0.5A
J2
OPT
C9
4.7
6.3V
0603
19
BAT
CHRG
BAT
R18
1k
5%
0603
U1
GND
SUSP
D1
CHRG
GREEN
DATE:
2
DWG NO.
REV
DC1276B
B
SHEET 1
Friday, February 08, 2008
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OF 1
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