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PDF SC1185 Data sheet ( Hoja de datos )
| Número de pieza | SC1185 | |
| Descripción | Programmable Synchronous DC/DC Converter / Dual LDO Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1185 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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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.
Typical Application Circuit
SC1185 & SC1185A
Programmable Synchronous DC/DC
Converter, Dual LDO Controller
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
12V
5V
1500uF
x4
+
10
0.1uF
+
4.7uF
PWRGOOD
VID0
VID1
VID2
VID3
VID4
EN
3.3V
0.1uF
5 VCC
7 PWRGOOD
CS+
CS-
9
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
REF 6
24 GATE2
GATE1 2
4 LDOS2
LDOS1 3
SC1185CS
330uF
+
IRLR024N
+
330uF
1.5V
2.5V
+
330uF
IRLR024N
1.9uH
1.00k
2.32k
5mOhm
VCC_CORE
1k
12V
+
3.3V
1500uF
x6
0.1uF
3
8
+
2-
1
LM358
4
IRLR024N
VLIN3
+
330uF
Revision: July 28, 2005
1
www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
VID4
VID3
VID2
VID1
VID0
VOSENSE
REF
D/A
CS- CS+
VCC
EN
CURRENT LIMIT
70mV
-
+
OSCILLATOR
R
Q
S
PWRGOOD
LDOS1
GATE1
OPEN
COLLECTORS
+
-
+
-
2.5V FET
CONTROLLER
+
-
ERROR
AMP
-
+
AGND
1.265V
REF
1.5V FET
CONTROLLER
SC1185 & SC1185A
LEVEL SHIFT
AND HIGH SIDE
MOSFET DRIVE
SHOOT-THRU
CONTROL
BSTH
DH
PGNDH
SYNCHRONOUS
MOSFET DRIVE
BSTL
DL
PGNDL
AGND
LDOV
REF
GATE2 LDOS2 AGND
2005 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Typical Characteristics
Typical Efficiency at Vo=3.5V
95%
90%
85%
80%
75%
3.5V Std
3.5V Sync
3.5V Sync Lo Rds
70%
0 2 4 6 8 10 12 14 16
Io (Am ps)
95%
90%
85%
80%
75%
70%
0
Typical Efficiency at Vo=2.5V
2.5V Std
2.5V Sync
2.5V Sync Lo Rds
2 4 6 8 10 12 14 16
Io (Amps)
Typical Ripple, Vo=2.8V, Io=10A
SC1185 & SC1185A
95%
90%
85%
80%
75%
70%
0
Typical Efficiency at Vo=2.8V
2.8V Std
2.8V Sync
2.8V Sync Lo Rds
2 4 6 8 10 12 14 16
Io (Am ps)
95%
90%
85%
80%
75%
70%
0
Typical Efficiency at Vo=2.0V
2.0V Std
2.0V Sync
2.0V Sync Lo Rds
2 4 6 8 10 12 14 16
Io (Am ps)
Transient Response Vo=2.8V, Io=300mA to 10A
2005 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC1185.PDF ] | |
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