DC1550 - Schematic

4
3
2
1
VBUS
E1
VBUS
4.35V - 5.5V J1
VBUS
1
D-
2
D+
3
TP2
ID
4
TP3
GND
5
4
TP1
C1
10uF
6.3V
0603
DD+
U1
C2
10uF VBUCK
6.3V
0603
R1
1.0
5%
ID
LTC3553EPD
VOUT
JP1
PBSTAT
VBUCK
USB Mini-B
E2
GND
VOUT
20
VBUS
VOUT
VOUT
18
BVIN
12
C9
2.2uF
6.3V
20%
0402
R2
100k
5%
E3
PBSTAT
E4
ON
3
4
PBSTAT
ON
CHRG
14
BAT
17
D2
CHRG
C10
10uF
6.3V
0603
R23
1K
5%
R24
100K
5%
E15
16
C8
100uF
6.3V
1206
20%
R20
1.0
5%
PROG
R3
1.87k
3
SW
1
100mA
500mA
JP3
OFF
VBUS
HPWR
JP2
19
VBUCK
ON
VLDO
OPEN
LDO_ON
E6
R4
10k 5%
E7
R5
10k 5%
7
VLDO
OPEN
R6
510k
5%
5
R7
510k
5%
D1
BAT54C
OFF
1
JP7
BUCK 1st
GND
VOUT
ON
R8
1M
5%
OPT
R10
1M
5%
OPT
R25
0
R26
0
OPT
E10
11
VINLDO
C5
1uF
10V
VLDO
E9
VLDO
3.3V
150mA
R16
20
5%
C4
4.7uF
4V
SEQ
LDO_FB
2
10
C3
1pF
5%
OPT
9
E8
GND
R15
2.05M
R14
649k
GND
NTC
JP8
R12
0
INT
R13
EXT
0
Unless noted:
Resistors: Ohms, 0402, 1%, 1/16W
Capacitors: uF, 0402, 10%, 50V
R11
100k
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
CIRUIT 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.
4
VOUT
21
SEQ
LDO 1st
R18
332k
R17
649k
STBY
NTC
3
VBUCK
1.2V
200mA
E11
TP4
LDO_ON
R9
100k
STBY
OPT
TP5
15
E13
GND
VBUCK
8
VBUS
PB2
OFF
BAT
GND
ENTC
R19
20
5%
C6
10pF
5%
LDO
2
JP6
EPL2014-103MLC
SUSP
VINLDO
6
CHRG
BAT
VFLOAT = 4.2V
500mA
E12
C7
10uF
6.3V
0603
BUCK_FB
1
2
3
L1
10uH
HPWR
BUCK_ON
J2
DF3-3P-2DSA
R22
1.0
5%
JP5
LDO_ON
JP4
BUCK_ON
BUCK_ON
R21
1.0
5%
SUSP
VBUCK
2
13
4
E14
PB1
ON
E5
PROG
E17
VOUT
2.9V - 5.5V
0.5A
E16
GND
3
2
CONTRACT NO.
APPROVALS
TECHNOLOGY
DRAWN:
G. Barbehenn
CHECKED:
TITLE:
SCHEMATIC
SIZE
DWG NO.
APPROVED:
ENGINEER:
G. Barbehenn
DESIGNER:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
LTC3553EPD: Micropower USB Power Manager
with Li-Ion Charger, Buck DC/DC, and LDO Regulator
X
DATE:
REV
DC1550A
Friday, July 24, 2009
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