DC1855A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
ANDY R.
01-21-13
PRODUCTION
GND
1
JP3
VOUT1 SELECT
R9
113k
R11
249k
R15
732k
OUT1
OUT2
BYP2
PWRGD1
R5
237k
PWRGD2
ADJ1
ADJ2
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
ON
1.5V
1.8V
2.5V
3.3V
5V
OPT
E5
8
7
C4
10uF
6.3V
0805
JP4
VOUT2 SELECT
9
D
PWRGD2
+
C10
OPT
7343
E6
VOUT2
250mA
C
GND
15
R8
54.9k
R10
113k
R12
249k
R14
402k
R16
732k
R18
OPT
10
18
13
12
11
6
5
R6
237k
B
29
19
24
25
26
3
4
* VIN2
C8
2.2V - 20V
4.7uF
50V
OPT
7343 E7 GND
16
IN2
IN1
OUT2
14
R17
OPT
27
B
OUT1
BYP1
+
E10
C6
0.01uF
28
R13
402k
SHDN2
C5
0.01uF
22
R7
54.9k
SHDN1
R4
1M
5%
5%
2
4
6
8
10
12
C3
22uF
6.3V
0805
1
3
5
7
9
11
C9
OPT
7343
R2
1M
C2
1uF
25V
0805
1
3
5
7
9
11
2
+
E4
23
GND
E3
2
4
6
8
10
12
VOUT1
750mA
1.5V
1.8V
2.5V
3.3V
5V
OPT
U1
LT3030EUFD
17
E9
JP2
VOUT2EN
JP1
VOUT1EN
IN2
5%
OFF
R1
1M
R3
1M
5%
R20
OPT
3
2
1
R19
OPT
20
C1
1uF
25V
0805
ON
OFF
C7
4.7uF
50V
OPT
7343
IN1
+
GND
C
DATE
E8
E2
PWRGD1
2
APPROVED
E1
21
* VIN1
2.2V - 20V
1
2
3
D
DESCRIPTION
* SEE DEMO MANUAL
CUSTOMER NOTICE
A
NOTE: UNLESS OTHERWISE SPECIFIED
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.
ANDY R.
1. ALL RESISTORS ARE IN OHMS 1% 0603
ALL CAPACITORS ARE IN MICROFARADS 0603.
TITLE: SCHEMATIC
4
3
IC NO.
DATE:
REV.
LT3030EUFD
DEMO CIRCUIT 1855A
N/A
SCALE = NONE
A
DUAL 750mA/250mA LDO REGULATOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
LT
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Monday, January 21, 2013
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