TPS74801-Q1
SLVSAI4A –OCTOBER 2010–REVISED FEBRUARY 2011
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TYPICAL CHARACTERISTICS (continued)
At TJ = +25°C, VIN = VOUT(TYP) + 0.3V, VBIAS = 5V, IOUT = 50mA, VEN = VIN, CIN = 1μF, CBIAS = 4.7μF, and COUT = 10μF,
unless otherwise noted.
VIN DROPOUT VOLTAGE vs
VBIAS DROPOUT VOLTAGE vs
IOUT AND TEMPERATURE (TJ)
(VBIAS – VOUT) AND TEMPERATURE (TJ)
200
180
160
140
120
100
80
2200
2000
1800
1600
1400
1200
1000
800
IOUT = 0.5A
+125°C
+25°C
+125°C
60
+25°C
-40°C
40
-40°C
20
600
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
0.5
1.0
1.5
VBIAS - VOUT (V)
IOUT (A)
Figure 9.
Figure 10.
VIN PSRR vs FREQUENCY
VBIAS PSRR vs FREQUENCY
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
IOUT = 0.1A
IOUT = 1.5A
IOUT = 100mA
IOUT = 0.5A
VIN = 1.8V
VIN = 1.8V
VOUT = 1.2V
VBIAS = 5V
CSS = 1nF
VOUT = 1.2V
CSS = 1nF
IOUT = 1.5A
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Figure 11.
Frequency (Hz)
Figure 12.
VIN PSRR vs (VIN – VOUT
)
NOISE SPECTRAL DENSITY
90
80
70
60
50
40
30
20
10
0
1
VOUT = 1.2V
IOUT = 1.5A
CSS = 1nF
IOUT = 100mA
VOUT = 1.2V
1kHz
CSS = 0nF
10kHz
0.1
100kHz
CSS = 10nF
CSS = 1nF
500kHz
0.01
0
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25
100
1k
10k
100k
V
IN - VOUT (V)
Frequency (Hz)
Figure 13.
Figure 14.
8
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