DC977A - Schematic

A
B
C
D
E
REVISION HISTORY
ECO
REV
DESCRIPTION
0
1
Change D1 from 1N4148WT to 1N4148WS
DATE
APPROVED
<DATE>
<APPROVED>
KSz
05/26/06
4
4
U1
LT1976BEFE
E1
VIN
4V-60V
R1
200k
C1
4.7uF
50V
E3
GND
E5
SHDN
3
3
4
C5
4700pF
1
2
5
15
SHDN
14
SYNC
CSS
9
11
VC
BIAS
10
FB
12
C6
100pF
C8
1uF
6.3V
R4
8.2k
BOOST
6
NC
SW
NC
7
E6
SYNC
NC
VIN
D3
8
CT
GND
PGFB
GND
PGOOD
17
16
(Opt)
D1
1N4148WS
C2
0.33uF
16V
C4
0.1uF
16V
L1
R6
(Opt)
+
33uH
CDRH8D28-330NC
Sumida
D2
10MQ100N
C3
100uF
6.3V
E4
GND
3
C7
(Opt)
R3
0
(Opt)
13
E2
VOUT
3.3V/1A
R2
16.5k
1%
E10
GND
R5
10k
1%
R7
(Opt)
R8
100k
E9
GND
E7
PGFB
OPTION
2
2
E8
PGOOD
APPROVALS
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice: Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customers 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
Applications Engineering for assistance.
1
A
B
DRAWN: Rudy Bautista
ENGINEER: Keith Sz.
APPROVED:
Size
CHECKED:
DCxxxA_00.PCB
C
1630 McCARTHY BLVD
www.linear.com
MILPITAS, CA. 95035
LTC Confidential (408)432-1900
(408)434-0507 (FAX) For Customer Use Only
Title
High Voltage 1.2A 200kHz Low Ripple
Step-Down Regulator
xxxA_x.DSN
Document Number
Date:
Sheet
D
Rev
Demo Circuit 977A
1
E
of
1
1
1
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