LP38798_15 Datasheet, PDF (9/27 Pages) Texas Instruments – LP38798 High PSRR, Ultra-Low-Noise, 800-mA Linear Voltage Regulator for RF/Analog Circuits

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LP38798
SNOSCT6B – MARCH 2013 – REVISED DECEMBER 2014
Typical Characteristics (continued)
Unless otherwise specified: V_IN = 5.5 V, V_OUT = 5 V, I_OUT = 10 mA, C_OUT = 10 µF MLCC 16 V X7R, and T_J = 25°C.
1.40
2.5
1.35
1.30
1.25
Rising V_EN (ON)
2.0
V_IN = 5.5 V
1.5
V_OUT = 1.2 V
1.20
1.0
1.15
0.5
1.10
1.05
0.0
Falling V_EN (OFF)
1.00
-0.5
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE, V_IN (V)
C025
TIME (50µs/DIV)
Ven
Vout 125SC
Vout 25SC
Vout -40SC
C026
Figure 13. Enable Thresholds vs V_IN
2.5
2.0
V_IN = 5.5 V
1.5
V_OUT = 1.5 V
1.0
Ven
0.5
Vout 125SC
0.0
Vout 25SC
Vout -40SC
-0.5
TIME (50µs/DIV)
C027
Figure 14. Start-Up Time
5.5
5.0
V_IN = 5.5 V
4.5
V_OUT = 5.0 V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
TIME (50µs/DIV)
Ven
Vout -40SC
Vout 25SC
Vout 125SC
C028
Figure 15. Start-Up Time
6.0
Vout = 5.0V
5.0
Vout = 3.3V
Vout = 1.2V
4.0
3.0
2.0
UVLO
1.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
V_IN (V)
C038
Figure 17. V_OUT vs. Rising V_IN
Figure 16. Start-Up Time
0.5
0.4
V_IN = 5.5 V
0.3
Normalized to T_J = 25SC
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-50 -25
0
25
50
75
TEMPERATURE, T_J (SC )
100
125
C029
Figure 18. V_FB Variation vs. T_J
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