DC2172A - Schematic

5
4
3
2
1
D
D
VIN
U1
E1
LTC7138EMSE
L1 150uH
VIN
R1
2M
C1
22uF +
200V
GND
VIN
SW
RUN
ANODE
3
R2
OPT
2
E4
3
14
1
VFB
RUN
JP3
C
ON
SS
OFF
12
R3
0
5
16
10
7
GND
C3
OPT
GND
R4
OPT
VPRG2
GND
C
R7
OPT
[3]
4. SMALLER AMOUNT OF COUT CAN BE USED
FOR APPLICATIONS THAT CAN TOLERATE
HIGHER OUPUT RIPPLE.
REFER TO THE DATA SHEET FOR
APPLICATIONS INFORMATION.
B
2
A
JP1
6
3
17
OPT
ISET
8
VIN
NC
NC
NC
NC
FB0
VOUT
C9
1.8V / 3.3V / 5V
0.1uF
400mA
E3
1
11
VOUT
C8
C10
OPT
1210
9
R8
E5
R6
0
D1
SBR1U200P1
3
VPRG1
C6
C7
100uF
10V
1210
CDRH105R
C4
47nF
FBO
E2
1
OVLO
2
4
13
15
4V - 140V
C2
1uF
200V
2220
[3]
B
2
A
1
B
B
JP2
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
2. FOR 5V OUTPUT, VIN RANGE IS 6V-140V.
[3]
A
VOUT
JP1
JP2
1.8V
B
B
3.3V
A
B
5.0V
B
A
EXT. R
A
A
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
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
TITLE: SCHEMATIC
5
4
3
IC NO.
LTC7138EMSE
DEMO CIRCUIT 2172A
N/A
SCALE = NONE
A
HIGH EFFICIENCY, HIGH VIN, 400mA
STEP-DOWN REGULATOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
Tuesday, January 06, 2015
2
SHEET 1
1
REV.
2
OF 1
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