TPS74901_16 Datasheet, PDF (8/36 Pages) Texas Instruments – 3-A Low Dropout Linear Regulator With Programmable Soft-Start

TPS74901
SBVS082I – JUNE 2007 – REVISED MAY 2016
www.ti.com
Typical Characteristics: I_OUT = 50 mA (continued)
At T_J = 25°C, V_IN = V_OUT(TYP) + 0.3 V, V_BIAS = 5 V, I_OUT = 50 mA, V_EN = V_IN, C_IN = 1 µF, C_BIAS = 4.7 µF, and C_OUT = 10 µF,
unless otherwise noted.
200
180
160
140
120
100
+25°C
80
+125°C
60
40
-40°C
20
I_OUT = 0.5A
2200
2000
1800
1600
1400
1200
1000
800
+125°C
-40°C
+25°C
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
600
0
0.5
1.0
1.5
2.0
2.5
3.0
V_BIAS - V_OUT (V)
I_OUT (A)
Figure 7. V_IN Dropout Voltage vs
(V_BIAS – V_OUT) and Temperature (T_J)
90
80
I_OUT = 0.1A
I_OUT = 1.5A
70
60
50
40
30
20
V_IN = 1.8V
V_OUT = 1.2V
10 ^VBIAS ^{= 5V}
C_SS = 1nF
0
10
100
1k
I_OUT = 0.5A
10k 100k
1M
10M
Frequency (Hz)
Figure 8. V_BIAS Dropout Voltage vs
I_OUT and Temperature (T_J)
90
80
70
I_OUT = 100mA
60
50
I_OUT = 500mA
40
30
20 _{VIN = 1.8V}
10 ^VOUT ^{= 1.2V}
C_SS = 1nF
0
10
100
I_OUT = 1500mA
I_OUT = 300mA
1k
10k 100k
1M
10M
Frequency (Hz)
Figure 9. V_BIAS PSRR vs Frequency
90 _{VOUT = 1.2V}
80 I_OUT = 1.5A
70 ^{CSS = 1nF}
1kHz
60
50
10kHz
40
500kHz
30
100kHz
20
10
0
0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25
V_IN - V_OUT (V)
Figure 11. V_IN PSRR vs (V_IN – V_OUT)
Figure 10. V_IN PSRR vs Frequency
1
I_OUT = 100mA
V_OUT = 1.2V
C_SS = 0nF
0.1
0.01
100
C_SS = 10nF _{CSS = 1nF}
1k
10k
Frequency (Hz)
100k
Figure 12. Noise Spectral Density
8
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