ADP195ACBZ-R7 datasheet(11/12 Pages) AD

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Data Sheet

ADP195

Rev. C | 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 26,

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

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

TIME (µs)

VEN

VIN = 1.2V

VIN = 1.8V

VIN = 2.5V

VIN = 3.6V

Figure 26. 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

T 10%

VEN

CH3 200mA Ω BW

VOUT

LOAD CURRENT

Figure 27. Typical Rise Time and Inrush Current,

CLOAD = 1 μF, VIN = 1.8 V, No Load

CH1 2V

CH2 1V

M4µs

A CH1

2.32V

T 10%

VEN

CH3 200mA Ω BW

VOUT

LOAD CURRENT

Figure 28. 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.

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

204060

100

TIME (µs)

VEN

VOUT AT 200mA

VOUT AT 100mA

Figure 29. Typical Turn-Off Time

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