SC1544 Ver la hoja de datos (PDF) - Semtech Corporation
Número de pieza
componentes Descripción
Fabricante
SC1544 Datasheet PDF : 15 Pages
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SC1544
POWER MANAGEMENT
Pin Descriptions
PRELIMINARY
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Name Pin Function
G5
Gate drive for MOSFET between VCC3 and 2.5V/3.3V Dual Memory.
3.3VDM Sense pin for 3.3V Dual Memory. Sense pin for 2.5V Dual Memory for 2.5V option.
G6
Gate drive for MOSFET between 5VSB and 2.5V/3.3V Dual Memory.
G7
Gate drive for MOSFET between VCC3 and 1.5V/3.3V AGP. High when 5VSB is present and
greater than UVLO.
AGP
Sense pin for 1.5V/3.3V AGP.
TYPEDET Select 1.5V or 3.3V for AGP, high = 3.3V.
PWR_OK Power_OK signal from silver box.
EN
Enable signal active high. Connect to 5VSB if not being used. Cycling the enable pin will reset
the over current latches.
/S3
Pulling this pin low (with /S5 high) causes the device to enter the S3 sleep state. Pulling both /S3
and /S5 low will cause the device to enter the S5 sleep state.
/S5
Pulling this pin low along with /S3 causes the device to enter the S5 sleep state.
USB
Enable pin for 5V Dual during S5 sleep state, high = ON.
PCI
Enable pin for 3.3V Dual during S5 sleep state, high = ON.
-CAP
Negative end of charge pump capacitor. Connect a 10nF ceramic capacitor between this pin
and pin 14 (+CAP).
+CAP Positive end of charge pump capacitor.
FC
Charge pump output (9V nominal). Decouple this pin with a 0.1µF ceramic capacitor.
5VSB 5V standby supply from silver box. Decouple this pin with a 1µF ceramic capacitor.
5VD
Sense pin for 5V Dual.
G1
Gate drive for MOSFET between 5VSB and 5V Dual.
G2/3
Gate drive for MOSFETs between VCC5 and 5V Dual and VCC3 and 3.3V Dual.
GND
Reference ground.
3.3VD Sense pin for 3.3V Dual.
G4
Gate drive for MOSFET between 5VSB and 3.3V Dual.
1.8V
Sense pin for 1.8V LDO.
G8
Gate drive for MOSFET between VCC3 (or 5VSB) and 1.8V. High when 5VSB is present and
greater than UVLO.
2002 Semtech Corp.
10
www.semtech.com
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