DC1869A - Schematic

5
4
3
2
1
VIN1
D
D
E2
E1
VIN1
6V TO 40V
TRANSIENT TO 60V
E3
GND
PG1
E5
150k
18
PG
C17
E7
SYNC
MODE
SYNC
1
10pF
(OPT)
10k
(OPT)
2
16
R10
1
BD
BOOST
5
9
IN2
1
2
200k
1%
100k
1%
47nF
C6
0.1µF
16V
GND
E16
IN2
15
11
0 Ohm
IN2
PG2
IN3
C10
1µF
16V
R15
B
R17
158k
1%
VOUT2
R13
E15
FB1
C15
1206
(OPT)
MMZ1608S601AT
0603
(OPT)
E11
340k
1%
GND
R18
0 Ohm
E17
IN3
B
499k
1%
E12
PG3
+
C1
10uF
63V
1. ALL RESISTORS 0603.
2. ALL CAPACITORS 0603.
SEE DEMO MANUAL FOR CURRENT CAPABILITY.
*
E13
VOUT3
3.3V / 200mA
C11
4.7µF
10V
0805
C12
TBD
E14
GND
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.
APPROVALS
TECHNOLOGY
PCB DES.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
A
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
APP ENG.
40V STEP-DOWN REGULATOR WITH DUAL LDOS
SIZE
C:\PADS PROJECTS\1869A(LT3776EUDD)\SCH\1869A_REV3.DSN
5
R16
150k
VIN1
NOTE: UNLESS OTHERWISE SPECIFIED.
A
E10
C8
TBD
VOUT3
VIN1_EMI
4.7uH
C16 CDRH2D18/LDNP-4R7NC
Sumida
1206
(OPT)
(OPT)
R11
150k
VOUT2
2.5V / 200mA
C7
4.7µF
10V
0805
EMI Filter
L2
C
E9
14
13
*
E6
931k
1%
R6
R14
158k
1%
IN3
R20
C14
FB2
PG3
VOUT1
R19
21
22 NC
NC
1.50k
1%
22pF
R7
10
5V /
C5
22µF
10V
0805
6
JP4
EN3/ILIM3
12
3
EN
47nF
R12
OUT2
OUT3
C13
17
7
DIS
C4
C9
1µF
16V
FB3
EN3
1.50k
1%
D1
DFLS160-7
EN2/ILIM2
GND
3
JP3
SYNC
E4
VOUT1
R9
294k
1%
PG2
JP2
2
EN
2
23
U1
LT3667EUDD#PBF
RT
3
RT
1
174k
1%
fs=600kHz
4
25
EN2
R8
FB1
8
C
R21
DA
PG
VOUT1
CDRH4D22HPNP-220MC
R5
JP1
DIS
SW
L1
22uH
24
VOUT1
3
DIS
EN
PG1
3
UVLO1
2
0.22µF
20
19
(OPT)
1
R3
150k
0 Ohm
C3
IN1
GND
ENABLE
EN
R2
R4
E8
VIN1
C2
2.2µF
100V
1206
R1
1M
IC NO.
N/A
SCALE = NONE
2
MODIFY DATE:
REV.
LT3667EUDD
DEMO CIRCUIT 1869A
Aug 19, 2014
13:18:19
3
SHEET
1
1
OF
1
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