ADP197ACBZ-R7 datasheet(12/16 Pages) AD

12 / 16 page

ADP197

Rev. 0 | Page 12 of 16

CH1 100mA

CH3 2V

CH2 1V

M1.00ms

A CH3

1.28V

T 10.20%

Ω

CH1 AMPL

204mA

Figure 27. Typical Turn-On Delay Time with VIN = 1.9 V, ILOAD = 200 mA

CH1 AMPL

222mA

CH1 100mA

CH3 2V

CH2 2V

M1.00ms

A CH3

1.28V

T 10.00%

Ω

Figure 28. Typical Turn-On Delay Time with VIN = 5.5 V, ILOAD = 220 mA

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 pump.

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 ADP197 although capacitors can be used to suppress noise

on the board.

CH1 AMPL

266mA

CH1 100mA

CH3 2V

CH2 2V

M1.00ms

A CH3

1.28V

T 10.00%

Ω

Figure 29. Typical Rise Time and Inrush Current,

CLOAD = 100 μF, VIN = 1.9 V, ILOAD = 270 mA

CH1 AMPL

352mA

CH1 200mA

CH3 2V

CH2 2V

M1.00ms

A CH3

1.28V

T 10.00%

Ω

Figure 30. Typical Rise Time and Inrush Current,

CLOAD = 100 μF, VIN = 5.5 V, ILOAD = 350 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. It

is also dependent on the RC time constant of the output capacit-

ance and load resistance. Figure 31 shows the typical turn-off

time with VIN = 3.6 V, COUT = 1 μF, and RLOAD = 18 Ω.

CH1 1V

CH2 1V

M20µs

A CH1

240mV

T 20.20%

Figure 31. Typical Turn-Off Time

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