TPS749XX_08 Datasheet, PDF (7/26 Pages) Texas Instruments – 3.0A Low Dropout Linear Regulator with Programmable Soft-Start

TPS749xx
www.ti.com
SBVS082B – JUNE 2007 – REVISED OCTOBER 2007
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.
200
180
160
140
120
100
80
60
40
20
0
0
V_IN DROPOUT VOLTAGE vs
(V_BIAS – V_OUT) AND TEMPERATURE (T_J)
I_OUT = 0.5A
-40°C
+25°C
+125°C
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_BIAS - V_OUT (V)
Figure 9.
V_BIAS PSRR vs FREQUENCY
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 11.
V_IN PSRR vs (V_IN – V_OUT)
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 13.
2200
2000
1800
1600
1400
1200
1000
800
600
0
V_BIAS DROPOUT VOLTAGE vs
I_OUT AND TEMPERATURE (T_J)
+125°C
-40°C
+25°C
0.5
1.0
1.5
2.0
2.5
3.0
I_OUT (A)
Figure 10.
V_IN PSRR vs FREQUENCY
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 12.
NOISE SPECTRAL DENSITY
1
I_OUT = 100mA
V_OUT = 1.2V
0.1
0.01
100
C_SS = 0nF
C_SS = 10nF _{CSS = 1nF}
1k
10k
Frequency (Hz)
Figure 14.
100k
Copyright © 2007, Texas Instruments Incorporated
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