ADP195 datasheet(11/12 Pages) AD

Part #	ADP195

Description	Logic Controlled, High-Side Power Switch with Reverse Current Blocking

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ADP195

Rev. 0 | Page 11 of 12

TIMING

Turn-on delay is defined as the delta between the time that VEN

reaches >1.2 V until VOUT rises to ~10% of its final value. The

ADP195 includes circuitry to have typical 5 μs turn-on delay at

3.6 V VIN to limit the VIN inrush current. As shown in Figure 22,

the turn-on delay is dependent on the input voltage.

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0

5

10

15

20

25

30

35

40

TIME (µs)

VEN

VIN = 1.2V

VIN = 1.8V

VIN = 2.5V

VIN = 3.6V

Figure 22. Typical Turn-On Delay Time with Varying Input Voltage

The rise time is defined as the delta between the time from

10% to 90% of VOUT reaching its final value. It is dependent on

the RC time constant where C = load capacitance (CLOAD) and

R = RDSON||RLOAD. Because RDSON is usually smaller than RLOAD,

an adequate approximation for RC is RDSON × CLOAD. An input

or load capacitor is not needed for the ADP195; however, capacitors

can be used to suppress noise on the board. If significant load

capacitance is connected, inrush current is a concern.

CH1 2V

CH2 1V

M4µs

A CH1

2.32V

2

3

1

T 10%

VEN

BW

CH3 200mA Ω BW

VOUT

LOAD CURRENT

BW

Figure 23. Typical Rise Time and Inrush Current,

CLOAD = 1 μF, VIN = 1.8 V, No Load

CH1 2V

CH2 1V

M4µs

A CH1

2.32V

2

3

1

T 10%

VEN

BW

CH3 200mA Ω BW

VOUT

LOAD CURRENT

Figure 24. Typical Rise Time and Inrush Current,

CLOAD = 1 μF, VIN = 1.8 V, Load = 200 mA

The turn-off time is defined as the delta between the time from

90% to 10% of VOUT reaching its final value. It is also dependent on

the RC time constant.

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0

204060

80

100

TIME (µs)

VEN

VOUT AT 200mA

VOUT AT 100mA

Figure 25. Typical Turn-Off Time

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