LP3872_15 Datasheet, PDF (6/28 Pages) Texas Instruments – LP387x 1.5-A Fast Ultra-Low-Dropout Linear Regulators

LP3872, LP3875
SNVS227H – FEBRUARY 2003 – REVISED JANUARY 2015
Electrical Characteristics (continued)
Unless otherwise specified: T_J = 25°C, V_IN = V_O(NOM) + 1 V, I_L = 10 mA, C_OUT = 10 µF, V_SD = 2 V.
PARAMETER
TEST CONDITIONS
MIN ⁽¹⁾
AC PARAMETERS
PSRR Ripple rejection
ρ_n(l/f)
e_n
Output noise density
Output noise voltage
V_IN = V_OUT + 1 V, C_OUT = 10 µF
V_OUT = 3.3 V, f = 120 Hz
V_IN = V_OUT + 0.5 V, C_OUT = 10 µF
V_OUT = 3.3 V, f = 120 Hz
f = 120 Hz
BW = 10 Hz – 100 kHz, V_OUT = 2.5 V
BW = 300 Hz – 300 kH, V_OUT = 2.5 V
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TYP⁽²⁾ MAX⁽¹⁾ UNIT
73
dB
57
0.8
µV
150
µV
100
(rms)
6.6 Typical Characteristics
Unless otherwise specified: T_J = 25°C, C_OUT = 10 µF, C_IN = 10 µF, SD pin is tied to V_IN, V_OUT = 2.5 V, V_IN = V_O(NOM) + 1 V, I_L =
10 mA
600
500
125^{o C}
400
o
25
C
300
200
-40^{o C}
100
0
0
0.5
1
1.5
OUTPUT LOAD CURRENT (A)
Figure 1. Dropout Voltage vs Output Load Current
10
1
0.1
0.01
0.001
-40 -20 0 20 40 60 80 100 125
TEMPERATURE (^oC)
Figure 3. Shutdown I_Q vs Junction Temperature
6
5
4
3
2
1
0
1.8 2.3 2.8 3.3 3.8 4.3 5.0
OUTPUT VOLTAGE (V)
Figure 2. Ground Current vs Output Voltage
I_L = 1.5 A
14
12
10
8
6
4
2
0
-40 -20 0 20 40 60 80 100 125
JUNCTION TEMPERATURE (^oC)
Figure 4. Errorflag Threshold vs Junction Temperature
6
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