SC1156SW.TR(2001) 데이터 시트보기 (PDF) - Semtech Corporation
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SC1156SW.TR
(Rev.:2001)
(Rev.:2001)
Semtech Corporation
SC1156SW.TR Datasheet PDF : 7 Pages
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SC1156
Programmable Synchronous DC/DC
Controller for Advanced Microprocessors
POWER MANAGEMENT
Description
Features
The SC1156 is a low-cost, full featured synchronous,
voltage-mode controller designed for use in single ended
power supply applications where efficiency is of primary
concern. Synchronous operation allows for the
elimination of heat sinks in many applications. The
SC1156 is ideal for implementing DC/DC converters
needed to power advanced microprocessors such as
Pentium® ll (Klamath), in both single and multiple
processor configurations. Internal level-shift, high-side
drive circuitry, and preset shoot-thru control, allows for
use of inexpensive n-channel power switches.
u Low cost / full featured
u Synchronous operation
u 5 Bit VID DAC programmable output
u On-chip power good and OVP functions
u Designed to meet Intel VRM8.1 (Klamath)
SC1156 features include an integrated 5-bit VID DAC, tem-
perature compensated voltage reference, triangle wave
oscillator, current limit comparator, frequency shift
over-current protection, and an accessible, internally
compensated error amplifier. Power good signaling, logic
compatible shutdown, and over voltage protection are
also provided.
Applications
u Pentium® II (Klamath) Core Supply
u Multiple MicroProcessor Supplies
u Voltage Regulation Modules (VRM)
u Programmable Power Supplies
u High Efficiency DC/DC Conversion
The SC1156 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external com-
ponent size, and cost.
Typical Application Circuit
12V IN
C1
0.1uF
C3
820uF
+
+
+
Q1
IRL3302S
R2
C10
3.9
0.1uF
C2
820uF
C4
820uF
R6
10
OVP
VID0
VID1
VID2
VID3
VID4
ENABLE
POWERGOOD
C12
0.1uF
R7
10k
U1
2 VCC
CS+ 6
3 OVP
CS- 5
20 VID0
VOSENSE 15
19 VID1
PWRGOOD 4
18 VID2
BSTH 13
17 VID3
DH 8
16 VID4
PGNDH 7
14 EN
BSTL 12
1 GND
DL 11
9 NC
PGNDL 10
SC1156CS
D1
1N4148
C11
0.1uF
L1
4uH
R1
5mOhm
C6
C8
1500uF 1500uF
+
+
Q2
IRL3302S
R3
3.9
R4
1.00k
+
+
C5
1500uF
C7
1500uF
C9
0.1uF
R5
2.32k
Pentium® ll Power Supply
Revision 4/01
1
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