Texas Instruments ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS TPS76901EVM-127 TPS76901EVM-127 Datenbogen
Produktcode
TPS76901EVM-127
Test Setup
3-5
Testing
Operation of the 1-V EVM with input voltages from 2.7 V to 3 V requires in-
creasing the bias current for the TL431. Changing R5 to 180
creasing the bias current for the TL431. Changing R5 to 180
Ω
accomplishes
this at the expense of higher quiescent currents. Figures 3–4 and 3–5 show
the results of this modification.
the results of this modification.
Figure 3–4. Quiescent Current vs Output Current
0
2
4
6
8
10
12
14
16
0
20
40
60
80
100
QUIESCIENT CURRENT
vs
OUTPUT CURRENT
VIN = 5 V
R5=180
R5=180
Ω
IO – Output Current – mA
– Quiscent Current – mA
I Q
Figure 3–5. Line Regulation from 2.7 V
1.033
1.0335
1.034
1.0345
1.035
1.0355
1.036
1.0365
1.037
1.0375
2
2.5
3
3.5
II =95.6 mA
II =12 mA
VI – Input Voltage – V
– Output V
oltage – V
V
O
4
4.5
5
R5=180
Ω
LINE REGULATION FROM 2.7 V