TPS795_15 Datasheet, PDF (15/33 Pages) Texas Instruments – TPS795 Ultralow-Noise, High-PSRR, Fast, RF, 500-mA Low-Dropout Linear Regulators

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TPS795
SLVS350I – OCTOBER 2002 – REVISED MAY 2015
  ^{3 u107 u R}1 ^{ R}2 
C₁
R₁ u R₂ 
(3)
The suggested value of this capacitor for several resistor ratios is shown in the table within Figure 26. If this
capacitor is not used (such as in a unity-gain configuration), then the minimum recommended output capacitor is
2.2 μF instead of 1 μF.
8.2.3 Application Curves
0.6
V_IN = 5.5 V
0.5
C_OUT = 10 mF
C_NR = 0.1 mF
0.4
I_OUT = 1 mA
0.3
0.2
I_OUT = 0.5 A
0.1
0
100
1k
10 k
100 k
Frequency (Hz)
Figure 27. TPS79530 Output Spectral Noise Density vs
Frequency
80
V_IN = 4 V
70 ^COUT ^{= 10 mF}
C_NR = 0.1 mF
60
I_OUT = 1 mA
50
40
30
I_OUT = 500 mA
20
10
0
1 10 100 1 k 10 k 100 k 1 M 10 M
Frequency (Hz)
Figure 28. TPS79530 Ripple Rejection vs Frequency
8.3 Do's and Don'ts
Place at least one 1-µF ceramic capacitor as close as possible to the OUT pin of the regulator.
Do not place the output capacitor more than 10 mm away from the regulator.
Connect a 0.1-μF or larger, low equivalent series resistance (ESR) capacitor across the IN pin and GND input of
the regulator.
Do not exceed the absolute maximum ratings.
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