SC1173 Semtech Corporation, SC1173 Datasheet - Page 6

• Manufacturer Part Number: SC1173
• Description: PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER WITH LOW DROPOUT REGULATOR CONTROLLER
• Manufacturer: Semtech Corporation

October 25, 1999
MATERIALS LIST
Qty. Reference
4
6
3
1
3
1
1
1
1
1
1
1
1
SETTING LDO OUTPUT VOLTAGE
V
3.45V
3.30V
3.10V
2.90V
2.80V
2.50V
1.50V
© 1999 SEMTECH CORP.
O
LDO
C1,C5,C13,C
18
C2,C3,C14-
C17
C11,C12,
C21
L1
Q1,Q2,Q3
R4
R5
R6
R1
R12
R13
R17
U1
Part/Description
0.1µF Ceramic
1500µF/6.3V
330µF/6.3V
4µH
See notes
5m
2.32k , 1%, 1/8W
1k , 1%, 1/8W
10 , 5%, 1/8W
1%, 1/8W
1%, 1/8W
100K, 5% 1/8W
SC1172/3CSW
R
R12
105
105
102
100
100
100
100
B
R
R13
182
169
147
130
121
97.6
18.7
Vendor
Various
SANYO
Various
See notes
IRC
Various
Various
Various
Various
Various
Various
SEMTECH
A
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
Notes
MV-GX or equiv. Low ESR
8 Turns 16AWG on MICROMETALS T50-52D core
FET selection requires trade-off between efficiency and
cost. Absolute maximum R
OAR-1 Series
See Table (Not required for SC1172)
See Table (Not required for SC1172)
I
R
R
See
R
V
Where
that
significan
FB
OUT
B
A
A
652 MITCHELL ROAD NEWBURY PARK CA 91320
and
layout
the
Feedback
Bottom
Top
. 1
:
R
I (
265
B
FB
t
feedback
error
must
diagram
R
feedback
R
R (
A
pin
)
B
be
A
term
bias
low
resistor
for
R
B
does
DS(ON)
resistor
)
clarificat
enough
current
I (
= 22 m for Q1,Q2
not
FB
R
cause
ion
so
A
)
SC1172/3
6