LP38798 Datasheet, PDF (8/23 Pages) Texas Instruments – LP38798-ADJ High PSRR, Ultra Low Noise, 800 mA Linear Voltage Regulator for RF/Analog Circuits

LP38798
SNOSCT6A – MARCH 2013 – REVISED MAY 2013
www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified: V_IN = 5.5V, V_OUT = 5.0 V, I_OUT = 10 mA, C_OUT = 10 µF MLCC 16V X7R, T_J = 25°C.
1.40
2.5
1.35
1.30
Rising V_EN (ON)
1.25
2.0
V_IN = 5.5 V
1.5
V_OUT = 1.2 V
1.20
1.0
1.15
1.10
1.05
1.00
0
Falling V_EN (OFF)
2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE, V_IN (V)
C025
Figure 14. Enable Thresholds vs V_IN
Ven
0.5
Vout 125ƒC
0.0
Vout 25ƒC
Vout -40ƒC
-0.5
TIME (50µs/DIV)
C026
Figure 15. Start-up Time, V_OUT = 1.2 V
2.5
2.0
V_IN = 5.5 V
1.5
V_OUT = 1.5 V
1.0
Ven
0.5
Vout 125ƒC
0.0
Vout 25ƒC
Vout -40ƒC
-0.5
TIME (50µs/DIV)
C027
Figure 16. Start-up Time, V_OUT = 1.5V
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 -40ƒC
Vout 25ƒC
Vout 125ƒC
C028
Figure 17. Start-up Time, V_OUT = 5.0 V
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 18. V_OUT vs. Rising V_IN
0.5
0.4
V_IN = 5.5 V
0.3
Normalized to T_J = 25ƒC
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-50
-25
0
25
50
75 100 125
TEMPERATURE, T_J (ƒC )
C029
Figure 19. V_FB Variation vs. T_J
8
Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: LP38798