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PDF SC1544 Datasheet ( Hoja de datos )

Número de pieza SC1544
Descripción ACPI Controller for Advanced Motherboards
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



Total 15 Páginas
		
SC1544 Hoja de datos, Descripción, Manual
SC1544
ACPI Controller for
Advanced Motherboards
POWER MANAGEMENT
Description
.eatures
PRELIMINARY
Semtech’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.
Typical Application Circuit
K Complete programmable supply for instantly available
PC systems
K Supports 2.5V memory or 3.3V memory (-2.5 or -3.3
option in part number)
K 5V dual and 3.3V dual supplies are programmable to
be active or inactive in S5
K Integrated AGP voltage supply with “TYPEDET” signal
for 3.3V or 1.5V operation
K Integrated LDO for 1.8V supply
K Integrated charge pump removes the need for PMOS
.ETs, enables single supply operation
K Over current protection on all dual outputs
K Inherent soft-start capability
K TSSOP-24 package
Applications
K Instantly available motherboards
5V
GND
3.3V
GND
5VSB
GND
5V DUAL
GND
3.3V DUAL
GND
3.3V DUAL MEM
GND
AGP
GND
1.8V
GND
TYPEDET
PWR_OK
EN
/SLP_S3
/SLP_S5
USB
PCI
C1
100uF/6.3V
C2
100uF/6.3V
C3
100uF/6.3V
Q1
IRLR3103
Q2
IRLR3103
C4
100uF/6.3V
Q3
IRLR3103
Q4
IRLR3103
C5
100uF/6.3V
Q5
IRLR3103
Q6
IRLR3103
C6
100uF/6.3V
Q7
IRLR3103
C7
100uF/6.3V
Q8
IRLR3103
C8
100uF/6.3V
U1
1
G5
2
3.3VDM
3
G6
4
G7
5
AGP
6
TYPEDET
7
PWR_OK
8
EN
9
/S3
10
/S5
11
USB
12
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
Revision 3, May 2002
1
C9 0.01uF
C10
0.1uF
C11
1uF
www.semtech.com

1 page

SC1544 pdf
SC1544
POWER MANAGEMENT
PRELIMINARY
Electrical Characteristics (Cont.)(1)
Unless specified: all applicable silver box supplies (3.3V, 5V, 5VSB) ± 5%, GND = 0V, VSENSE PINS = VOUT(NOM), TA = 25°C. Values in bold apply over full
operating ambient temperature range.
Parameter
Symbol
Test Conditions
Min Typ Max Units
AGP Output (Cont.)
Gate 7 Drive Current(4)
Sense Pin Bias Current
IG7(SOURCE)
IG7(SINK)
IAGP
FC (Charge Pump)
VAGP = VOUT(NOM) - 100mV, VG7 = 5V
VAGP = VOUT(NOM) + 100mV, VG7 = 3V
VAGP = 3.3V, TYPEDET = High
VAGP = 1.5V, TYPEDET = Low
2
-3.5
-235
-70
4
-5
-340
-105
mA
-445
-140
µA
Output Voltage
Overcurrent Protection(14)
VFC
V5VSB = 5V
9.0 9.5 10.0 V
Trip Threshold
Short Circuit Immunity(15)
V
TH(OC)
30 50 70 %V
OUT
1 75 ms
Notes:
(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(2) Guaranteed by design.
(3) Applies to S0 only.
(4) Gates 7 and 8 are high whenever 5VSB is present and greater than VUVLO, unless the over current protection
has been tripped.
(5) Applies to S3 sleep state only for 3.3V Dual Memory option. Applies to both S0 and S3 sleep state for 2.5V
Dual Memory Option
(6) Gate 5 is high in S0 and low in the S3 and S5 sleep states.
(7) Gate 6 is high in the S3 sleep state and low in S0 and in the S5 sleep state.
(8) Applies to S3 sleep state and S5 sleep state when the PCI pin is high.
(9) Gate 3 is high in S0 and low in the S3 and S5 sleep states.
(10) Gate 4 is high in the S3 sleep state and the S5 sleep state when the PCI pin is high. Gate 4 is low in S0,
and in the S5 sleep state when the PCI pin is low.
(11) Gate 2 is high in S0 and low in the S3 and S5 sleep states.
(12) Gate 1 is high in the S3 sleep state and the S5 sleep state when the USB pin is high. Gate 1 is low in S0,
and in the S5 sleep state when the USB pin is low.
(13) Applies to S0 only. VAGP = 3.3V when TYPEDET is high and 1.5V when the TYPEDET pin is low.
(14) Applies to 2.5V/3.3V Dual Memory, 3.3V Dual and 5V Dual outputs when enabled only. When an output is
disabled, that output is not monitored for OCP. The 1.8V and AGP outputs do not have over current protection.
(15) Minimum and maximum time limits for over current protection to trip when powered up (or enabled) into a
shorted output and when a short is applied to an enabled, OCP protected output.
2002 Semtech Corp.
5
www.semtech.com

5 Page

SC1544 arduino
SC1544
POWER MANAGEMENT
Typical Applications Circuits
PRELIMINARY
5V
GND
3.3V
GND
5VSB
GND
5V DUAL
GND
3.3V DUAL
GND
3.3V DUAL MEM
GND
AGP
GND
1.8V
GND
TYPEDET
PWR_OK
EN
/SLP_S3
/SLP_S5
USB
PCI
C1
100uF/6.3V
C2
100uF/6.3V
C3
100uF/6.3V
C4
100uF/6.3V
Q3
IRLR3103
C5
100uF/6.3V
Q5
IRLR3103
Q6
IRLR3103
C6
100uF/6.3V
Q7
IRLR3103
C7
100uF/6.3V
Q8
IRLR3103
C8
100uF/6.3V
Q1
IRLR3103
Q4
IRLR3103
U1
1
G5
2
3.3VDM
3
G6
4
G7
5
AGP
6
TYPEDET
7
PWR_OK
8
EN
9
/S3
10
/S5
11
USB
12
PCI
Q2
IRLR3103
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
Notes:
(1) 3.3V option shown - see below for Q5 configuration for 2.5V option.
(2) 1.8V output shown powered from 3.3V. If powered from 5VSB, this becomes 1.8VSB.
(3) See Applications Information.
C10
0.1uF
C11
1uF
3.3V
GND
5VSB
GND
2.5V DUAL MEM
GND
C2
100uF/6.3V
D1
C3
100uF/6.3V
C6
100uF/6.3V
Q5 Q6
Q5 body diode in series with D1 to pre-charge 2.5V Dual Memory
D1 to ensure that the linear regulator will still regulate
2002 Semtech Corp.
11
U1
1
G5
2
2.5VDM
3
G6
4
G7
5
AGP
6
TYPEDET
7
PWR_OK
8
EN
9
/S3
10
/S5
11
USB
12
PCI
SC1544-2.5
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
www.semtech.com

11 Page


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