ADP198
APPLICATIONS INFORMATION
GROUND CURRENT
The major source for ground current in the ADP198 is an internal
4 M? pull-down resistor on the enable pin. Figure 23 shows
the typical ground current when V EN = V IN and varies from
1.65 V to 6.5 V.
Data Sheet
As shown in Figure 24, an increase in quiescent current can occur
when V EN ≠ V IN . This is caused by the CMOS logic nature of the
level shift circuitry as it translates a V EN signal ≥1.2 V to a logic
high. This increase is a function of the V IN ? V EN delta.
60
20
50
18
16
14
12
I LOAD
I LOAD
I LOAD
I LOAD
I LOAD
I LOAD
= 10mA
= 100mA
= 200mA
= 400mA
= 800mA
= 1000mA
40
30
10
20
8
6
4
10
2
0
0
1
2
3
4
5
6
0
ENABLE VOLTAGE (V)
1.5
2.0
2.5
3.0
3.5
4.0
V IN (V)
4.5
5.0
5.5
6.0
6.5
Figure 24. Typical Ground Current when V EN ≠ V IN
Figure 23. Ground Current vs. Load Current
Rev. G | Page 12 of 16
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