SC1164 Просмотр технического описания (PDF) - Semtech Corporation
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SC1164
Semtech Corporation
SC1164 Datasheet PDF : 12 Pages
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October 25, 1999
MATERIALS LIST
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1164/5
Qty. Reference Part/Description Vendor
4 C1,C5,C13,C 0.1µF Ceramic
18
6 C2,C3,C14- 1500µF/6.3V
C17
6 C9-C12,
330µF/6.3V
C21, C22
1 L1
4µH
Various
SANYO
Various
4 Q1,Q2,Q3, See notes
Q4
1 R4
5mΩ
See notes
IRC
1 R5
2.32kΩ, 1%, 1/8W Various
1 R6
1kΩ, 1%, 1/8W
Various
1 R1
10Ω, 5%, 1/8W
Various
1 R12
1%, 1/8W
Various
1 R13
1%, 1/8W
Various
1 R14
1%, 1/8W
Various
1 R15
1%, 1/8W
Various
2 R17,R18
100kΩ, 5%,1/8W Various
1 U1
SC1164/5CSW
SEMTECH
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 RDS(ON) = 22 mΩ for Q1,Q2
OAR-1 Series
See Table Below (Not required for SC1164)
See Table Below (Not required for SC1164)
See Table Below (Not required for SC1164)
See Table Below (Not required for SC1164)
Required if Voltage is applied to the linear FET(s) without
12V applied to SC1164/5
SETTING LDO OUTPUT VOLTAGE
VOUT LDO1 (LDO2)
3.45V
3.30V
3.10V
2.90V
2.80V
2.50V
1.50V
RB
R12 (R14)
105Ω
105Ω
102Ω
100Ω
100Ω
100Ω
100Ω
RA
R13 (R15)
182Ω
169Ω
147Ω
130Ω
121Ω
97.6Ω
18.7Ω
VOUT
=
1.265 ⋅ (RA
RB
+ RB )
+ (IFB
⋅RA )
Where :
IFB = Feedback pin bias current
RA = Top feedback resistor
RB = Bottom feedback resistor
See layout diagram for clarification
RA and RB must be low enough so
that the (IFB ⋅ RA ) term does not cause
significant error
© 1999 SEMTECH CORP.
6
652 MITCHELL ROAD NEWBURY PARK CA 91320
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