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SC1544TS-X.XTR Datasheet

  • SC1544TS-X.XTR

  • ACPI Controller for Advanced Motherboards

  • 15頁(yè)

  • SEMTECH   SEMTECH

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POWER MANAGEMENT
Description
Semtech聮s SC1544, SC243x and SC1112A or SC1114
provide all the voltages necessary for an ACPI system.
The SC1544 offers five independant supplies: a 5V dual
supply for USB, a 3.3V dual supply for PCI, a 3.3V or
2.5V dual supply for memory, a 1.5V or 3.3V supply for
AGP and a 1.8V supply. The AGP supply is programmble
using the system TYPEDET signal.
An on-board internal charge pump eliminates the need
for P-channel MOS.ETs and enables function from a single
5V supply (system 5VSB). All dual outputs are over current
protected.
The SC1544 differs from the SC1547 in three important
ways: 1) the device initially starts up in S5, and not G0
like the SC1547; 2) the gate drives for the 1.8V and AGP
outputs are always high in normal operation; 3) no OCP
on the 1.8V and AGP outputs.
ACPI Controller for
Advanced Motherboards
PRELIMINARY
.eatures
K
Complete programmable supply for instantly available
K
K
K
K
K
K
K
K
PC systems
Supports 2.5V memory or 3.3V memory (-2.5 or -3.3
option in part number)
5V dual and 3.3V dual supplies are programmable to
be active or inactive in S5
Integrated AGP voltage supply with 聯(lián)TYPEDET聰 signal
for 3.3V or 1.5V operation
Integrated LDO for 1.8V supply
Integrated charge pump removes the need for PMOS
.ETs, enables single supply operation
Over current protection on all dual outputs
Inherent soft-start capability
TSSOP-24 package
SC1544
Applications
K
Instantly available motherboards
Typical Application Circuit
5V
GND
3.3V
GND
5VSB
GND
5V DUAL
GND
3.3V DUAL
GND
3.3V DUAL MEM
GND
AGP
GND
1.8V
GND
C8
100uF/6.3V
C7
100uF/6.3V
Q8
IRLR3103
C6
100uF/6.3V
Q7
IRLR3103
C5
100uF/6.3V
Q5
IRLR3103
Q6
IRLR3103
C4
100uF/6.3V
Q3
IRLR3103
C3
100uF/6.3V
C2
100uF/6.3V
C1
100uF/6.3V
Q1
IRLR3103
Q2
IRLR3103
Q4
IRLR3103
U1
1
2
3
4
5
G5
3.3VDM
G6
G7
AGP
TYPEDET
PWR_OK
EN
/S3
/S5
USB
PCI
SC1544-3.3
G8
1.8V
G4
3.3VD
GND
G2/3
G1
5VD
5VSB
FC
+CAP
-CAP
24
23
22
21
20
19
18
17
16
15
14
13
C9
0.01uF
C10
0.1uF
C11
1uF
TYPEDET
PWR_OK
EN
/SLP_S3
/SLP_S5
USB
PCI
6
7
8
9
10
11
12
Revision 3, May 2002
1
www.semtech.com

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