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ADP198
TIMING
Turn-on delay is defined as the delta between the time that V EN
reaches >1.2 V and when V OUT rises to ~10% of its final value. The
Data Sheet
ADP198 includes circuitry to have typical 10 μs turn-on delay at
3.6 V V IN to limit the V IN inrush current.
The rise time is defined as the delta between the time from
10% to 90% of V OUT reaching its final value. It is dependent on
1
INPUT CURRENT
the RC time constant where C = load capacitance (C LOAD ) and
R = RDS ON ||R LOAD . Because RDS ON is usually smaller than R LOAD ,
2
OUTPUT VOLTAGE
an adequate approximation for RC is RDS ON × C LOAD . An input
or load capacitor is not needed for the ADP198 ; however, capacitors
can be used to suppress noise on the board. If significant load
capacitance is connected, inrush current may be a concern. The
3
ENABLE
CH1 200mA ? BW CH2 2.00V BW
CH3 2.00V BW
M100μs
T 10.20%
A CH3
1.48V
start-up time is the sum of the turn-on delay time plus the rise
time.
Figure 29. Typical Rise Time and Inrush Current,
C LOAD = 1 μF, V IN = 3.6 V, I LOAD = 200 mA, Code 10
rise time for each of the four settings on SEL0 and SEL1.
INPUT CURRENT
INPUT CURRENT
1
1
OUTPUT VOLTAGE
2
OUTPUT VOLTAGE
ENABLE
2
3
ENABLE
CH1 200mA ? BW CH2 2.00V BW
CH3 2.00V BW
M200μs
T 10.20%
A CH3
1.48V
3
CH1 200mA ? BW CH2 2.00V BW
CH3 2.00V BW
M20.0μs
T 10.20%
A CH3
1.48V
Figure 30. Typical Rise Time and Inrush Current,
C LOAD = 1 μF, V IN = 3.6 V, I LOAD = 200 mA, Code 11
Figure 27. Typical Rise Time and Inrush Current,
C LOAD = 1 μF, V IN = 3.6 V, I LOAD = 200 mA, Code 00
The turn-off time is defined as the delta between the time from
90% to 10% of V OUT reaching its final value. It is also dependent on
the RC time constant.
Table 6. Start-Up Time Pin Settings
Start-Up Time (μs)
1
INPUT CURRENT
OUTPUT VOLTAGE
SEL1
0
0
1
1
SEL0
0
1
0
1
(Turn-On Delay + Rise Time)
22
200
450
1100
2
ENABLE
3
CH1 200mA ? BW CH2 2.00V BW
CH3 2.00V BW
M40.0μs
T 10.20%
A CH3
1.48V
Figure 28. Typical Rise Time and Inrush Current,
C LOAD = 1 μF, V IN = 3.6 V, I LOAD = 200 mA, Code 01
Rev. G | Page 14 of 16
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