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PDF SC1112 Data sheet ( Hoja de datos )
| Número de pieza | SC1112 | |
| Descripción | Triple Low Dropout Regulator Controllers | |
| Fabricantes | Semtech | |
| Logotipo |  |
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SC1112
Triple Low Dropout
Regulator Controllers
POWER MANAGEMENT
Description
.eatures
The SC1112 was designed for the latest high speed
motherboards. It includes three low dropout regulator con-
trollers. The controllers provide the power for the system
AGTL bus Termination Voltage, Chipset, and clock circuitry.
An adjustable controller with a 1.2V reference is available,
while two selectable outputs are provided for the VTT
(1.25 V or 1.5V, SC1112) or (1.2V or 1.5V, SC1112A)
and the AGP (1.5V or 3.3V). The SC1112 low dropout
regulators are designed to track the 3.3V power supply
as the VTTIN supply is cycled On and Off. A latched short
circuit protection is also available for the VTT output.
Other features include an integrated charge pump that
provides adequate gate drives for the external Mosfets,
and a capacitive programable delay for the power good
signal.
K Triple linear controllers
K Selectable and Adjustable Output Voltages
K LDOs track input voltage within 200mV (.unction of
the Mosfets used) until regulation
K Integrated Charge Pump
K Programmable Power Good delay Signal
K Latched Over Current Protection (VTT)
Applications
K Pentium® III Motherboards
K Triple power supplies
Typical Application Circuit
+3.3V
VTT +5V STBY
1K C1
R1 10u
C6
330u
POWER GOOD
SC1112/A
C3
0.1u
Q2
5VSTBY
GND
ADJGATE AGPGATE
Q3 C14
330u
ADJ
0.1u C11
ADJSEN
CAP-
AGPSEN
VTTGATE
AGP
C2 C18
Q1 330u C16 C17
RA
CAP+
VTTSEN
330u 0.1u
1u C10
FC
AGPSEL
VTT
C13 C12
0.1u 330u
RB
22n C5
DELAY
PWRGD
VTTSEL
VTTIN
C19 C8 C9
330u 330u 0.1u
VTT SELECT Signal
AGP SELECT Signal
Revision 7, October 2001
1
www.semtech.com
1 page  
POWER MANAGEMENT
Timing Diagrams (Cont.)
VTTIN
SHORT-CIRCUIT DURING NORMAL
OPERATION
VTT
Once VTT drops out of
regulation, VTTGATE turns on
harder to try and raise VTT.
When VTT drops below 1.08V,
the delay capacitor is
discharged and PWRGD goes
low. When VTT drops below DELAY
0.7V, the delay capacitor
begins charging.
If VTT is still below 0.7V when
DELAY reaches 1.5V,
VTTGATE is latched off.
VTT=1.08V
VTT=0.7V
DELAY=1.5V
PWRGD
VTTGATE
VTTIN
SHORT-CIRCUIT AND RECOVERY
DURING NORMAL OPERATION
Once VTT drops out of
regulation, VTTGATE turns on
VTT
harder to try and raise VTT.
When VTT drops below 1.08V,
the delay capacitor is discharged
and PWRGD goes low. When
VTT drops below 0.7V, the delay
capacitor begins charging.
If VTT recovers above 0.7V
before DELAY reaches 1.5V,
DELAY is again discharged.
DELAY
If VTT reaches 1.08V the delay
capacitor begins charging and
normal operation continues.
VTT=1.08V
VTT=0.7V
VTT=1.08V
DELAY=1.5V
PWRGD
2001 Semtech Corp.
VTTGATE
5
SC1112
www.semtech.com
5 Page 
SC1112
POWER MANAGEMENT
Typical Characteristics (Cont.)
AGP (1.5V) Output Voltage @ Io = 0A vs Ta
1.5055
1.5050
1.5045
1.5040
1.5035
1.5030
1.5025
1.5020
1.5015
1.5010
5V Stby = 5.25V
5V Stby = 5.00V
5V Stby = 4.75V
1.5005
0
10 20 30 40 50 60 70
Ta (°C.)
AGP (3.3V) Output Voltage @ Io = 0A vs Ta
3.2900
3.2890
3.2880
3.2870
3.2860
3.2850
3.2840
3.2830
5V Stby = 5.25V
5V Stby = 5.00V
5V Stby = 4.75V
3.2820
0
142
140
10 20 30 40 50 60
Ta (°C.)
AGP Sense Bias current vs Ta
70
5V Stby = 5.25V
5V Stby = 5.00V
5V Stby = 4.75V
138
136
134
132
130
128
0
10 20 30 40 50 60 70
Ta (°C.)
2001 Semtech Corp.
AGP (1.5V) Output Voltage @ Io = 2A vs Ta
1.5035
1.5030
1.5025
1.5020
1.5015
1.5010
1.5005
1.5000
1.4995
1.4990
5V Stby = 5.25V
5V Stby = 5.00V
5V Stby = 4.75V
1.4985
0
10 20 30 40 50 60 70
Ta (°C.)
AGP (3.3V) Output Voltage @ Io = 2A vs Ta
3.2900
3.2890
3.2880
3.2870
3.2860
3.2850
3.2840
3.2830
5V Stby = 5.25V
5V Stby = 5.00V
5V Stby = 4.75V
3.2820
0
10 20 30 40 50 60 70
Ta (°C.)
AGP Gate Current @ Vgate = 3V, 5V Stby = 4.75 vs Ta
900
Sink current
Source current
850
800
750
700
650
600
0
10 20 30 40 50 60 70
Ta (°C.)
11 www.semtech.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SC1112.PDF ] | |
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