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ADP194
TIMING
Turn-on delay is defined as the delta between the time that EN
V EN
Data Sheet
reaches >1.1 V until VOUT rises to ~10% of its final value. The
ADP194 includes circuitry to set the typical 1.5 μs turn-on delay
3
V OUT
the turn-on delay is dependent on the input voltage.
4.0
3.5
3.0
2.5
1
2
LOAD CURRENT
2.0
CH1 1.00V BW
CH3 1.00V BW
CH2 200mA ? BW M4.00μs A CH3
T 10.00%
400mV
1.5
Figure 22. Typical Rise Time and Inrush Current with V IN = 3.6 V, C LOAD = 1 μF
1.0
0.5
V EN
V IN = 1.5V
V IN = 1.8V
V IN = 2.5V
V IN = 3.6V
The fall time or turn-off time of VOUT is defined as the time
delta between the 90% and 10% points of VOUT as it transi-
tions to its final value. The turn-off time is also dependent on
0
0
20
40
60
80
10 0
the RC time constant.
TIME (μs)
Figure 20. Typical Turn-On Delay Time with Varying Input Voltage
The rise time of VOUT is defined as the time delta between the
10% and 90% points of VOUT as it transitions to its final value.
It is dependent on the RC time constant where C = load capacit-
ance (C LOAD ) and R = RDS ON ||R LOAD . Because RDS ON is usually
smaller than R LOAD , an adequate approximation for RC is RDS ON ×
C LOAD . The ADP194 does not need any input or load capacitor,
but capacitors can be used to suppress noise on the board. If
3
1
V EN
V OUT
significant load capacitance is connected, inrush current may
be a concern.
2
LOAD CURRENT
CH3 1.00V BW
3
V EN
CH1 500mV BW CH2 200mA ? BW M2.00μs A CH3
T 10.00%
400mV
Figure 23. Typical Turn-Off Time, V IN = 1.8 V, R LOAD = 3.6 Ω
V OUT
V EN
1
LOAD CURRENT
3
V OUT
2
1
CH3 1.00V BW
CH1 500mV BW CH2 200mA ? BW M20.0μs
T 10.00%
A CH3
400mV
Figure 21. Typical Rise Time and Inrush Current with V IN = 1.8 V, C LOAD = 1 μF
2
LOAD CURRENT
CH1 1.00V BW
CH3 1.00V BW
CH2 200mA ? BW M2.00μs A CH3
T 10.00%
400mV
Figure 24. Typical Turn-Off Time, V IN = 3.6 V, R LOAD = 7.5 Ω
Rev. A | Page 10 of 12
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