Datasheet

200
180
160
140
120
100
80
60
40
20
0
0
1.51.00.5 2.0 2.5 3.0 3.5 4.0
V (mV)
DO IN OUT
(V V )-
V V-
BIAS OUT
(V)
4.5
+125 C°
+25 C°
- °40 C
I =0.5A
OUT
2200
2000
1800
1600
1400
1200
1000
800
600
0
0.5 1.0
V (V -
DO BIAS
V )(mV)
OUT
I (A)
OUT
1.5
+125 C°
+25 C°
- °40 C
90
70
60
50
40
30
20
10
0
10
100 1k 10k 100k 1M
Power-SupplyRejectionRatio(dB)
Frequency(Hz)
10M
V =1.8V
IN
V =1.2V
OUT
V =5V
BIAS
C =1nF
SS
I =0.5A
OUT
I =0.1A
OUT
I =1.5A
OUT
80
90
80
70
60
50
40
30
20
10
0
10
100 1k 10k 100k 1M
Power-SupplyRejectionRatio(dB)
Frequency(Hz)
10M
V =1.8V
IN
V =1.2V
OUT
C =1nF
SS
I =100mA
OUT
I =1.5A
OUT
90
80
70
60
50
40
30
20
10
0
0
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
Power-SupplyRejectionRatio(dB)
V V-
IN OUT
(V)
2.25
1kHz
10kHz
100kHz
500kHz
V
OUT
=1.2V
I
OUT
=1.5A
C
SS
=1nF
1
0.1
0.01
100
1k 10k
OutputSpectralNoiseDensity(mV/Ö )
Hz
Frequency(Hz)
100k
C =1nF
SS
C =0nF
SS
C =10nF
SS
I =100mA
OUT
V =1.2V
OUT
TPS74801
SBVS074J –JANUARY 2007– REVISED JANUARY 2012 www.ti.com
TYPICAL CHARACTERISTICS (continued)
At T
J
= +25°C, V
IN
= V
OUT(TYP)
+ 0.3V, V
BIAS
= 5V, I
OUT
= 50mA, V
EN
= V
IN
, C
IN
= 1μF, C
BIAS
= 4.7μF, and C
OUT
= 10μF,
unless otherwise noted.
V
IN
DROPOUT VOLTAGE vs V
BIAS
DROPOUT VOLTAGE vs
(V
BIAS
– V
OUT
) AND TEMPERATURE (T
J
) I
OUT
AND TEMPERATURE (T
J
)
Figure 9. Figure 10.
V
BIAS
PSRR vs FREQUENCY V
IN
PSRR vs FREQUENCY
Figure 11. Figure 12.
V
IN
PSRR vs (V
IN
– V
OUT
) NOISE SPECTRAL DENSITY
Figure 13. Figure 14.
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