SC1453_08 Datasheet, PDF (11/15 Pages) Semtech Corporation – 150mA Ultra Low Dropout Regulator with Low Noise Bypass

SC1453
POWER MANAGEMENT
Typical Characteristics (Cont.)
Output Spectral Noise Density vs. Frequency
vs. Output Voltage, C = 100µF
OUT
10
V_IN = V_OUT + 1V
I_OUT = 1mA
C_IN = 1µF
1
C_BYP = 10nF
T_J = 25°C
0.1
0.01
Top to bottom:
V_OUT = 3.3V
V_OUT = 3.0V
V_OUT = 2.8V
V_OUT = 2.5V
V_OUT = 1.8V
V_OUT = 1.5V
0.001
0.01
0.1
1
10
f (kHz)
100
1000
Output Spectral Noise Density vs. Frequency
vs. Bypass Capacitance
10
C_BYP = 1nF
C_BYP = 10nF
1
C_BYP = 100nF
C_BYP = 1µF
0.1
0.01
V_OUT = 1.5V
V_IN = 2.5V
I_OUT = 1mA
C_IN = 1µF
C_OUT = 1µF
T_J = 25°C
0.001
0.01
0.1
1
10
f (kHz)
100
1000
Power Supply Rejection Ratio vs. Frequency
vs. Output Voltage, C_BYP = 10nF
80
70
60
50
40
30 _{VIN = VOUT + 1V}
20
C_IN = C_OUT = 1µF
C_BYP = 10nF
10 ^{IOUT = 1mA}
T_J = 25°C
0
0.01
0.1
Top to bottom:
V_OUT = 1.5V
V_OUT = 1.8V
V_OUT = 2.5V
V_OUT = 2.8V
V_OUT = 3.0V
V_OUT = 3.3V
1
10
f (kHz)
100
1000
Output Spectral Noise Density vs. Frequency
vs. Output Capacitance
10
1
0.1
0.01
V_OUT = 1.5V
V_IN = 2.5V
I_OUT = 1mA
C_BYP = 10nF
C_IN = 1µF
T_J = 25°C
0.001
0.01
0.1
Left to right:
C_OUT = 100µF
C_OUT = 44µF
C_OUT = 22µF
C_OUT = 10µF
C_OUT = 1µF
1
10
f (kHz)
100
1000
Output Spectral Noise Density vs. Frequency
vs. Output Current
10
Top to bottom:
I_OUT = 150mA
I_OUT = 100mA
1
I_OUT = 50mA
I_OUT = 1mA
0.1
0.01
V_OUT = 1.5V
V_IN = 2.5V
C_IN = 1µF
C_BYP = 10nF
C_OUT = 1µF
T_J = 25°C
0.001
0.01
0.1
1
10
f (kHz)
100
1000
Power Supply Rejection Ratio vs. Frequency
vs. Output Voltage, C_BYP = 100nF
80
70
60
50
40
30 _{VIN = VOUT + 1V}
20 ^{CIN = COUT = 1µF}
C_BYP = 100nF
10 ^IOUT ^{= 1mA}
T_J = 25°C
0
0.01
0.1
Top to bottom:
V_OUT = 1.5V
V_OUT = 2.5V
V_OUT = 1.8V
V_OUT = 2.8V
V_OUT = 3.0V
V_OUT = 3.3V
1
10
f (kHz)
100
1000
 2008 Semtech Corp.
11
www.semtech.com