ADP199 datasheet(13/16 Pages) AD

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Data Sheet

ADP199

Rev. 0 | Page 13 of 16

CH2 500mV

CH1 1V

CH3 20mA Ω

M10µs

A CH1

100mV

T 10%

VEN

OUTPUT VOLTAGE

INPUT CURRENT

Figure 34. Typical Turn-On Delay Time with VIN = 1.2 V,

ILOAD = 10 mA, CLOAD = 1 μF

CH2 1V

CH1 2V BW

CH3 200mA Ω

M4µs

A CH1

1.28mV

T 10%

VEN

OUTPUT VOLTAGE

INPUT CURRENT

Figure 35. Typical Turn-On Delay Time with VIN = 3.6 V,

ILOAD = 10 mA, CLOAD = 1 μF

The rise time is defined as the time it takes the output voltage to

rise from 10% to 90% of VOUT reaching its final value. It is depen-

dent on the rise time of the internal charge pum

For very large values of output capacitance, the RC time constant

(where C is the load capacitance (CLOAD) and R is the RDSON||RLOAD)

can become a factor in the rise time of the output voltage. Because

RDSON is much smaller than RLOAD, an adequate approximation

for RC is RDSON × CLOAD. An input or load capacitor is not required

for the ADP199 although capacitors can be used to suppress

noise on the board.

CH2 500mV

CH1 1V BW

CH3 500mA Ω

M40µs

A CH1

700mV

T 10.4%

VEN

OUTPUT VOLTAGE

INPUT CURRENT

Figure 36. Typical Rise Time and Inrush Current,

CLOAD = 100 μF, VIN = 1.2 V, ILOAD = 100 mA

CH2 1V

CH1 2V BW

CH3 2A Ω

M40µs

A CH1

720mV

T 10.4%

VEN

OUTPUT VOLTAGE

INPUT CURRENT

Figure 37. Typical Rise Time and Inrush Current,

CLOAD = 100 μF, VIN = 3.6 V, ILOAD =100 mA

The turn-off time is defined as the time it takes for the output

voltage to fall from 90% to 10% of VOUT reaching its final value.

The turn-off time is also dependent on the RC time constant of

the output capacitance and load resistance. Figure 38 shows the

typical turn-off time with VIN = 1.8 V, COUT = 1 μF, and RLOAD =

18 Ω.

CH2 1V

CH1 500mV

M20µs

A CH2

660mV

T 10.2%

ENABLE VOLTAGE VEN

INPUT CURRENT

Figure 38. Typical Turn-Off Time

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