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SC1185CSW.TR 参数 Datasheet PDF下载

SC1185CSW.TR图片预览
型号: SC1185CSW.TR
PDF下载: 下载PDF文件 查看货源
内容描述: 可编程同步DC / DC [Programmable Synchronous DC/DC]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件页数/大小: 14 页 / 253 K
品牌: SEMTECH [ SEMTECH CORPORATION ]
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Programmable Synchronous DC/DC
Converter, Dual LDO Controller
POWER MANAGEMENT
Description
The SC1185 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 SC1185 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 SC1185 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 SC1185 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.
SC1185 & SC1185A
Features
Synchronous design, enables no heatsink solution
95% efficiency (switching section)
5 bit DAC for output programmability
On chip power good function
Designed for Intel Pentium
®
ll requirements
1.5V, 2.5V @ 1.25% for linear section
1.265V ± 1.5% Reference available
24-lead SO package. Lead free option available.
Lead free product is fully WEEE and RoHS
compliant.
Applications
Pentium
®
ll microprocessor supplies
Flexible motherboards
1.3V to 3.5V microprocessor supplies
Programmable triple power supplies
Typical Application Circuit
12V
5V
+
4.7uF
+
1500uF
x4
10
0.1uF
0.1uF
PWRGOOD
VID0
VID1
VID2
VID3
VID4
EN
5
7
22
21
20
19
18
16
1
23
24
4
VCC
PWRGOOD
VID0
VID1
VID2
VID3
VID4
EN
AGND
LDOV
GATE2
LDOS2
CS+
CS-
VOSENSE
BSTH
DH
BSTL
DL
PGNDH
PGNDL
REF
GATE1
LDOS1
9
8
17
15
11
14
13
10
12
6
2
3
12V
2R2
+
0.1uF
2R2
IRLR3103N
1.9uH
0.1uF
IRLR3103N
1.00k
5mOhm
2.32k
VCC_CORE
1k
3.3V
1500uF
x6
SC1185CS
3.3V
3
2
+
330uF
IRLR024N
+
330uF
330uF
+
1.5V
2.5V
8
+
-
4
1
LM358
IRLR024N
VLIN3
+
330uF
IRLR024N
Revision: July 28, 2005
1
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