SC1454 Ver la hoja de datos (PDF) - Semtech Corporation
Número de pieza
componentes Descripción
Fabricante
SC1454 Datasheet PDF : 14 Pages
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SC1454
POWER MANAGEMENT
Typical Characteristics (Cont.)
Output Spectral Noise Density vs. Frequency
vs. Output Capacitance
10
1
0.1
0.01
0.001
VOUT = 1.8V
VIN = 2.8V
IOUT = 50mA
CBYP = 10nF
CIN = 1µF
TJ = 25°C
0.01
0.1
Left to right:
COUT = 44µF
COUT = 22µF
COUT = 10µF
COUT = 2.2µF
1
10
100
f (kHz)
1000
Output Spectral Noise Density vs. Frequency
10.000
1.000
vs. Output Current
Top to bottom:
IOUT = 150mA
IOUT = 100mA
IOUT = 50mA
IOUT = 1mA
0.100
0.010
VOUT = 1.8V
VIN = 2.8V
CIN = 1µF
CBYP = 10nF
COUT = 2.2µF
TJ = 25°C
0.001
0.01
0.1
1
10
100
f (kHz)
PSRR vs. Frequency vs. Output Voltage
(CBYP = 100nF)
100
90
80
70
60
50
40
30
VIN = VOUT + 1V
CIN = COUT = 1µF
20 CBYP = 100nF
10
IOUT = 1mA
TJ = 25°C
0
Top to bottom:
VOUT = 1.8V
VOUT = 2.5V
VOUT = 2.8V
VOUT = 3.0V
VOUT = 3.3V
0.01
0.1
1
10
100
f (kHz)
1000
1000
Output Spectral Noise Density vs. Frequency
vs. Bypass Capacitance
10
VOUT = 1.8V
VIN = 2.8V
IOUT = 50mA
CIN = 1µF
1
COUT = 2.2µF
TJ = 25°C
0.1 CBYP = 100pF
CBYP = 1nF
CBYP = 10nF
CBYP = 100nF
CBYP = 1µF
0.01
0.01
0.1
1
10
100
f (kHz)
PSRR vs. Frequency vs. Output Voltage
(C = 10nF)
BYP
100
90
80
70
60
50
40
30
VIN = VOUT + 1V
CIN = COUT = 1µF
20 CBYP = 10nF
10
IOUT = 1mA
TJ = 25°C
Top to bottom:
VOUT = 1.8V
VOUT = 2.5V
VOUT = 2.8V
VOUT = 3.0V
VOUT = 3.3V
0
0.01
0.1
1
10
100
f (kHz)
1000
1000
2005 Semtech Corp.
11
www.semtech.com
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