Datasheet

Data Sheet ADP199
Rev. A | Page 13 of 16
CH2 500mV
CH1 1V
B
W
B
W
B
W
CH3 20mA Ω
M10µs A CH1 100mV
T 10%
1
3
2
09672-034
V
EN
OUTPUT VOLTAGE
INPUT CURRENT
Figure 34. Typical Turn-On Delay Time with V
IN
= 1.2 V,
I
LOAD
= 10 mA, C
LOAD
= 1 µF
CH2 1VCH1 2V
B
W
B
W
B
W
CH3 200mA Ω
M4µs A CH1 1.28mV
T 10%
1
3
2
09672-035
V
EN
OUTPUT VOLTAGE
INPUT CURRENT
Figure 35. Typical Turn-On Delay Time with V
IN
= 3.6 V,
I
LOAD
= 10 mA, C
LOAD
= 1 µF
The rise time is defined as the time it takes the output voltage to
rise from 10% to 90% of V
OUT
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 (C
LOAD
) and R is the RDS
ON
||R
LOAD
)
can become a factor in the rise time of the output voltage. Because
RDS
ON
is much smaller than R
LOAD
, an adequate approximation
for RC is RDS
ON
× C
LOAD
. An input or load capacitor is not required
for the ADP199 although capacitors can be used to suppress
noise on the board.
CH2 500mVCH1 1V
B
W
B
W
B
W
CH3 500mA Ω
M40µs A CH1 700mV
T 10.4%
1
3
2
09672-036
V
EN
OUTPUT VOLTAGE
INPUT CURRENT
Figure 36. Typical Rise Time and Inrush Current,
C
LOAD
= 100 µF, V
IN
= 1.2 V, I
LOAD
= 100 mA
CH2 1VCH1 2V
B
W
B
W
B
W
CH3 2A Ω
M40µs A CH1 720mV
T 10.4%
1
3
2
09672-037
V
EN
OUTPUT VOLTAGE
INPUT CURRENT
Figure 37. Typical Rise Time and Inrush Current,
C
LOAD
= 100 µF, V
IN
= 3.6 V, I
LOAD
=100 mA
The turn-off time is defined as the time it takes for the output
voltage to fall from 90% to 10% of V
OUT
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 V
IN
= 1.8 V, C
OUT
= 1 μF, and R
LOAD
=
18 Ω.
09672-038
CH2 1VCH1 500mV
B
W
B
W
M20µs A CH2 660mV
T 10.2%
1
2
ENABLE VOLTAGE V
EN
INPUT CURRENT
Figure 38. Typical Turn-Off Time