DC1389A - Schematic

REVISION HISTORY
ECO
REV
DESCRIPTION
0
1
2
DATE
APPROVED
1st PROTOTYPE
04-10-08
George Yu.
PRODUCTION
01/05/09
Chuen MT
01-27-10
Fran H.
Value Change: R4 from 1.50M to 1M 1%, R5 from 332k to 221k 1%
Value Change: L2 & L3.
E1
VIN
2.4V - 5V
VIN
+
E2
CIN1
47uF
10V
GND
ON
CIN2
4.7uF
10V
SHDN1
1
CIN3
4.7uF
10V
CIN4
4.7uF
10V
U1
LTC3521EUF
3
1
9
R1
VOUT1
R2
VOUT2
4
PGOOD1
3
2
PGOOD3
15
E10
PGOOD2
E11
PGOOD3
11
22
R6
137K
1%
C1
22pF
GND
C5
10uF
6.3V
0805
C4
22pF
R8
102K
1%
VOUT3
1.2V / 600mA
C7
0.1uF
E8
23
GND
PGND2
PGND1B
R9
100K
1%
18
FB1
FB3
E7
VOUT3
CDRH2D18/HP-3R3NC
Sumida
VOUT1
12
C10
(Opt)
17
SW1B
C9
(Opt)
8
L3
3.3uH
SW1A
GND
R4
1.00M
1%
E6
24
PGOOD3
6
C3
22uF
6.3V
1206
C6
0.1uF
R7
68.1K
1%
PGND1A
16
R5
221K
1%
E9
VOUT2
1.8V / 600mA
PGOOD2
21
14
E4
PGOOD1
E5
VOUT2
C2
10uF
6.3V
0805
PGOOD1
SW3
VOUT1
GND
SHDN3
GND
R3
1M
4.7uH
CDRH5D16NP-4R7NC
Sumida
C8
0.1uF
L2
3.3uH
20
CDRH2D18/HP-3R3NC
Sumida
FB2
PGOOD2
7
1M
VOUT3
L1
E3
SHDN2
25
3
JP4
VOUT1
3.3V / 1A
PWM
1M
2
OFF
SHDN1
SW2
JP3
ON
PVIN2
10
2
PVIN1
5
VIN
SHDN2
1
SHDN3
1
BURST
JP1
3
OFF
PWM
3
JP2
ON
MODE
2
2
OFF
1
PGOOD1
PGOOD2
PGOOD3
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
RB
Fran H.
SYNCHRONOUS 1A BUCK-BOOST AND DUAL 600mA BUCK CONVERTER
N/A
SCALE = NONE
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
DATE:
IC NO.
REV.
LTC3521EUF
DEMO CIRCUIT 1389A
Thursday, February 11, 2010
2
SHEET
1
OF
1
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