ADP195ACPZ-R7 datasheet(10/12 Pages) AD

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ADP195

Data Sheet

Rev. C | Page 10 of 12

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 VEN = VIN and varies from 1.2 V to 3.6 V.

100

150

200

250

300

350

400

450

500

LOAD (mA)

VIN = 1.2V

VIN = 1.6V

VIN = 2.0V

VIN = 2.4V

VIN = 2.8V

VIN = 3.2V

VIN = 3.4V

VIN = 3.6V

Figure 22. Ground Current vs. Load Current

As shown in Figure 23, an increase in quiescent current can occur

when VEN ≠ VIN. This is caused by the CMOS logic nature of the

level shift circuitry as it translates an VEN signal ≥ 1.2 V to a

logic high. This increase is a function of the VIN − VEN delta.

0.4

0.8

1.2

1.6

2.0

2.4

2.8

3.2

3.6

VEN (V)

VIN = 1.2V

VIN = 1.5V

VIN = 1.8V

VIN = 2.5V

VIN = 3.6V

Figure 23. Typical Ground Current when VEN ≠ VIN

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 VEN crosses the active threshold, VOUT

turns on. When a falling voltage on VEN crosses the inactive

threshold, VOUT turns off.

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

1.2

0.4 0.5 0.6 0.7

0.1 0.2 0.3

0.8 0.9 1.0 1.1

VEN (V)

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 VIN 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

1.05

0.95

0.85

0.75

0.65

0.55

0.45

0.35

VIN (V)

EN ACTIVE

EN INACTIVE

Figure 25. Typical EN Thresholds vs. Input Voltage (VIN)

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