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ADP198ACBZ-11-R7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
ADP198 Data Sheet
Rev. G | Page 12 of 16
APPLICATIONS INFORMATION
GROUND CURRENT
The major source for ground current in the ADP198 is an internal
4 MΩ pull-down resistor on the enable pin. Figure 23 shows
the typical ground current when V
EN
= V
IN
and varies from
1.65 V to 6.5 V.
0
2
4
6
8
10
12
14
16
18
20
1.5 2.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
GROUND CURRENT (µA)
V
IN
(V)
I
LOAD
= 1000mA
I
LOAD
= 100mA
I
LOAD
= 10mA
I
LOAD
= 200mA
I
LOAD
= 400mA
I
LOAD
= 800mA
09484-023
Figure 23. Ground Current vs. Load Current
As shown in Figure 24, an increase in quiescent current can occur
when V
EN
≠ V
IN
. This is caused by the CMOS logic nature of the
level shift circuitry as it translates a V
EN
signal ≥1.2 V to a logic
high. This increase is a function of the V
IN
− V
EN
delta.
0
10
20
30
40
50
60
0 1
2 3
4
5 6
GROUND CURRENT (µA)
ENABLE VOLTAGE (V)
09484-024
Figure 24. Typical Ground Current when V
EN
≠ V
IN
Data Sheet ADP198
Rev. G | Page 13 of 16
ENABLE FEATURE
The ADP198 uses the EN pin to enable and disable the VOUT
pin under normal operating conditions. As shown in Figure 25,
when a rising V
EN
voltage crosses the active threshold, VOUT
turns on. When a falling V
EN
voltage crosses the inactive
threshold, VOUT turns off.
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
V
OUT
(V)
ENABLE VOLTAGE (V)
V
IN
RISING
V
IN
FALLING
09484-025
Figure 25. Typical EN Operation
As shown in Figure 25, the EN pin has hysteresis built in. This
prevents on/off oscillations that can occur due to noise on the
EN pin as it passes through the threshold points.
The EN pin active/inactive thresholds derive from the V
IN
voltage;
therefore, these thresholds vary with the changing input voltage.
Figure 26 shows the typical EN active/inactive thresholds when
the input voltage varies from 1.65 V to 6.5 V.
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1
2 3
4
5 6 7
ENABLE THRESHOLD (V)
INPUT VO
LTAGE (V)
EN RISE
EN FALL
09484-026
Figure 26. Typical EN Thresholds vs. Input Voltage (V
IN
)
ADP198 Data Sheet
Rev. G | Page 14 of 16
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
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
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
,
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
start-up time is the sum of the turn-on delay time plus the rise
time.
Figure 27 through Figure 30 show the turn-on delay and output
rise time for each of the four settings on SEL0 and SEL1.
CH1 200mA
Ω
B
W
CH3 2.00V
B
W
A CH3 1.48V
2
1
3
CH2 2.00V
B
W
M20.0µs
T 10.20%
09484-027
INPUT CURRENT
OUTPUT VOLTAGE
ENABLE
Figure 27. Typical Rise Time and Inrush Current,
C
LOAD
= 1 µF, V
IN
= 3.6 V, I
LOAD
= 200 mA, Code 00
CH1 200mA Ω
B
W
CH3 2.00V
B
W
A CH3 1.48V
2
1
3
CH2 2.00V
B
W
M40.0µs
T 10.20%
09484-028
INPUT CURRENT
OUTPUT VOLTAGE
ENABLE
Figure 28. Typical Rise Time and Inrush Current,
C
LOAD
= 1 µF, V
IN
= 3.6 V, I
LOAD
= 200 mA, Code 01
CH1 200mA Ω
B
W
CH3 2.00V
B
W
A CH3 1.48V
2
1
3
CH2 2.00V
B
W
M100µs
T 10.20%
09484-029
INPUT CURRENT
OUTPUT VOLTAGE
ENABLE
Figure 29. Typical Rise Time and Inrush Current,
C
LOAD
= 1 µF, V
IN
= 3.6 V, I
LOAD
= 200 mA, Code 10
CH1 200mA
Ω
B
W
CH3 2.00V
B
W
A CH3 1.48V
2
1
3
CH2 2.00V
B
W
M200µs
T 10.20%
09484-030
INPUT CURRENT
OUTPUT VOLTAGE
ENABLE
Figure 30. Typical Rise Time and Inrush Current,
C
LOAD
= 1 µF, V
IN
= 3.6 V, I
LOAD
= 200 mA, Code 11
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
SEL1 SEL0
Start-Up Time (μs)
(Turn-On Delay + Rise Time)
0 0 22
0 1 200
1 0 450
1 1 1100
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

ADP198ACBZ-11-R7

Mfr. #:
Buy ADP198ACBZ-11-R7
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - Power Distribution Logic-Cntrld 1A Hi-Side Load Switch
Lifecycle:
New from this manufacturer.
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