DC1471A - Schematic

A
B
C
D
E
REVISION HISTORY
ECO
REV
DESCRIPTION
1
DATE
APPROVED
MOLLY Z.
04/29/10
PRODUCTION
4
4
VIN
6.5V - 62V
L1
33uH
LPS6225-333ML
VIN
C2
0.22uF
16V
0603
VIN
E3
6
+
E4
3
U1
LT3990EMSE
C4
10uF
100V
C3
2.2uF
100V
1210
14
4
GND
3
5
7
10
12
15
VOUT
R6
100K
0402
E6
SW
PG
BOOST
EN/UVLO
BD
NC
NC
NC
NC
NC
NC
FB
FB
RT
11
R1
1.00M
1%
C1
22uF
10V
1206
C5
22pF
E1
VOUT
5V / 350mA
E2
GND
13
3
1
2
R2
316K
1%
16
R5
374K
1%
0402
(400kHz)
GND GND
8
PG
9
VOUT
17
E5
EN/UVLO
VIN
2
1
ON
2
2
R8
(Opt)
3
OFF
JP1
R7
(Opt)
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.
1
TECHNOLOGY
RB
MOLLY Z.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
B
C
IC NO.
DATE:
REV.
LT3990EMSE/LT3990IMSE
DEMO CIRCUIT 1471A
N/A
SCALE = NONE
1
62V 350mA STEP-DOWN REGULATOR WITH
2.5uA QUIESCENT CURRENT AND INTEGRATED DIODES
SIZE
C:\PADS PROJECTS\1471A\SCH\1471A_REV1.DSN
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
Thursday, May 13, 2010
SHEET
D
E
1
1
OF
1
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