SC1166 データシートの表示（PDF） - Semtech Corporation
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SC1166 Datasheet PDF : 14 Pages
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POWER MANAGEMENT
Description
SC1166
Programmable Synchronous DC/DC
Converter, Dual LDO Controller
Features
The SC1166 combines a synchronous voltage mode con-
troller with two low-dropout linear regulators providing
most of the circuitry necessary to implement three DC/
DC converters for powering advanced microprocessors
such as Pentium® II .
The SC1166 switching section features an integrated 5
bit D/A converter, pulse by pulse current limiting, inte-
grated power good signaling, and logic compatible shut-
down. The SC1166 switching section operates at a fixed
frequency of 140kHz, providing an optimum compromise
between size, efficiency and cost in the intended appli-
cation areas. The integrated D/A converter provides pro-
grammability of output voltage from 2.0V to 3.5V in
100mV increments and 1.30V to 2.05V in 50mV incre-
ments with no external components.
The SC1166 linear sections are low dropout regulators
supplying 1.5V for GTL bus and 2.5V for non-GTL I/O.
The Reference voltage is made available for external lin-
ear regulators.
u Synchronous design, enables no heatsink solution
u 95% efficiency (switching section)
u 5 bit DAC for output programmability
u On chip power good function
u Designed for Intel Pentium® ll requirements
u 1.5V, 2.5V linear controllers
u 1.265V ± 1.75% Reference available
Applications
u Pentium® ll microprocessor supplies
u Flexible motherboards
u 1.3V to 3.5V microprocessor supplies
u Programmable triple power supplies
Typical Application Circuit
12V
5V
+
10
1500uF
x4
0.1uF
+
4.7uF
PWRGOOD
VID0
VID1
VID2
VID3
VID4
EN
3.3V
0.1uF
5 VCC
7 PWRGOOD
CS+ 9
CS- 8
0.1uF
22
VID0
VOSENSE 17
IRLR3103N
21 VID1
20 VID2
BSTH 15
DH 11
2R2
19 VID3
BSTL 14
IRLR3103N
18 VID4
16 EN
DL 13
PGNDH 10
2R2
1 AGND
PGNDL 12
23
LDOV
6
REF
24 GATE2
GATE1 2
4 LDOS2
LDOS1 3
SC1166CSW
330uF
+
IRLR024N
1.5V
+
330uF
2.5V
+
330uF
IRLR024N
1.9uH
1.00k
2.32k
5mOhm
VCC_CORE
1k
12V
+
3.3V
1500uF
x6
0.1uF
8
3
+
2
-
1
LM358
4
IRLR024N
VLIN3
+
330uF
Revision 1, December 2000
1
This datasheet has been downloaded from http://www.digchip.com at this page
www.semtech.com
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