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ADP195
APPLICATIONS INFORMATION
GROUND CURRENT
The major source for ground current in the ADP195 is an internal
4 MΩ pull-down on the enable pin. Figure 22 shows the typical
ground current when V EN = V IN and varies from 1.2 V to 3.6 V.
10
Data Sheet
ENABLE FEATURE
The ADP195 uses the EN pin to enable and disable the VOUT
pin under normal operating conditions. As shown in Figure 24,
when a rising voltage on V EN crosses the active threshold, V OUT
turns on. When a falling voltage on V EN crosses the inactive
8
V IN = 1.2V
V IN = 1.6V
V IN = 2.0V
V IN = 2.4V
V IN = 2.8V
V IN = 3.2V
V IN = 3.4V
V IN = 3.6V
threshold, V OUT turns off.
2.0
1.8
1.6
6
1.4
1.2
4
2
1.0
0.8
0.6
0.4
0
0
50
100
150
200
250
300
350
400
450
500
0.2
LOAD (mA)
Figure 22. Ground Current vs. Load Current
0
0
0.1
0.2
0.3
0.4
0.5
0.6 0.7
V EN (V)
0.8
0.9
1.0
1.1
1.2
V IN = 1.8V
V IN = 3.6V
As shown in Figure 23, 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 an V EN signal ≥ 1.2 V to a
logic high. This increase is a function of the V IN ? V EN delta.
16
V IN = 1.2V
V IN = 1.5V
14
V IN = 2.5V
12
10
Figure 24. Typical EN Operation
As shown in Figure 24, the EN pin has hysteresis built in. This
prevents on/off oscillations that can occur due to noise on the
EN pin as it passes through the threshold points.
The EN pin active/inactive thresholds derive from the V IN voltage;
therefore, these thresholds vary with the changing input voltage.
Figure 25 shows the typical EN active/inactive thresholds when
the input voltage varies from 1.2 V to 3.6 V.
1.15
8
1.05
6
0.95
4
2
0.85
0.75
EN ACTIV E
0
0
0.4
0.8
1.2
1.6 2.0
V EN (V)
2.4
2.8
3.2
3.6
0.65
0.55
E N INACTIVE
Figure 23. Typical Ground Current when V EN ≠ V IN
0.45
0.35
V IN (V)
Figure 25. Typical EN Thresholds vs. Input Voltage (V IN )
Rev. C | Page 10 of 12
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