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SC1173CSW Datasheet(PDF) 6 Page - Semtech Corporation

No. de pieza SC1173CSW
Descripción Electrónicos  PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER WITH LOW DROPOUT REGULATOR CONTROLLER
PDF  12 Pages
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Fabricante Electrónico  SEMTECH [Semtech Corporation]
Página de inicio  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC1173CSW Datasheet(HTML) 6 Page - Semtech Corporation

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



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